Pricing and payment
- How much does it cost to have a technician look at my furnace or AC? A service call is a $79 trip charge. Full answer on our pricing page
- How much is a furnace or AC tune-up? A furnace tune-up or an AC tune-up starts at $129. Full answer on our pricing page
- Do you charge extra for towns farther from Minneapolis? No. Pricing is the same in every town we serve, with no mileage charge or distance surcharge, from a Minneapolis duplex to a farmhouse at the edge of our area. Full answer on our service areas page
- Do you offer financing? Financing is available on installs. Full answer on our pricing page
Scheduling and service area
What are your hours?
We're open seven days a week, 7am to 9pm, weekends included. No-heat calls get priority on the schedule, since a Minnesota house loses heat fast on a below-zero night. If you smell gas or your carbon monoxide alarm goes off, get everyone outside and call 911 or your gas utility first, then call us at 612-429-3465.
How soon can a technician get to my house?
Call 612-429-3465 any day from 7am to 9pm and we'll give you the earliest opening on the schedule. No-heat calls get priority. The first sub-zero week in January or the first run of 90-degree days in June fills the schedule fast, and calling earlier in the day gives you the best chance at an earlier visit.
Which towns do you serve?
We serve Minneapolis and Saint Paul plus about 50 miles around: the Twin Cities metro, Lake Minnetonka and the west metro, the Crow River and Carver County towns, the I-94 and Highway 10 towns out to Monticello and Becker, southern river towns like Northfield, Le Sueur and Red Wing, and Western Wisconsin around Hudson, River Falls and Prescott. Every town has its own page on our service areas list.
What should I have ready when I call?
Your town, the type of equipment (furnace, boiler, air conditioner, heat pump or mini-split) and what it's doing. If you can, read the brand and model number off the label inside the furnace door or on the outdoor unit, and note any blinking light code on the control board. A rough age helps too. You can call 612-429-3465 between 7am and 9pm, seven days a week. Those details tell the technician what kind of system and fault to expect.
Repairs and warranties
What warranty comes with a repair or a new install?
Completed repairs come with a written 1-year parts-and-labor warranty. If a part we installed fails within that year, we come back and fix it without charging you for the part or the labor. Installs carry a 2-year labor warranty from us, on top of the manufacturer's parts warranty. Many manufacturers require online registration soon after installation for their longer parts coverage, so check your brand's terms and keep the invoice, model and serial numbers.
Do you work on my brand of furnace or air conditioner?
Yes. We service every major brand: furnaces and air conditioners from Carrier, Trane, Lennox, Goodman, Rheem, York and the rest, mini-splits from Mitsubishi, Daikin, Fujitsu and LG, boilers from Weil-McLain, Burnham, Navien and others, and thermostats and air quality equipment. Many brands share a parent company and parts. The brands page has a page for each one; if yours isn't there, call and ask.
Are you licensed and insured?
We're licensed in Minnesota and Wisconsin and insured, and our technicians hold EPA Section 608 certification for handling refrigerant. Minnesota has no statewide HVAC contractor license, but a business must file a mechanical contractor bond with the Department of Labor and Industry, and cities such as Minneapolis add their own licensing. Ask any contractor which bond and city licenses it holds.
Replacements and rebates
Are there rebates for a new furnace, AC or heat pump?
Often, through your utility. Xcel Energy, CenterPoint Energy, Minnesota Energy Resources and many electric co-ops and municipal utilities run rebate programs, and Focus on Energy covers Wisconsin. Amounts and rules change every year, so check your utility's current program instead of trusting an old number. Some rebates need a utility-registered contractor, so ask whether the rebate needs a registered contractor before you buy. Our rebate guide has more.
Has the federal tax credit for HVAC equipment ended?
Yes. The federal 25C Energy Efficient Home Improvement Credit ended for equipment placed in service after December 31, 2025, under a law signed in July 2025. It used to cover heat pumps, central air, furnaces and boilers. The 25D credit for geothermal and other residential clean energy ended at the same time. Utility rebates are a separate thing and still run, so check your utility for this year's program. Details are in our guide to the HVAC tax credits.
What refrigerant do new air conditioners use?
New residential central air and heat pump systems now ship with lower-GWP refrigerants, mainly R-454B or R-32, under the EPA's AIM Act rules. They replace R-410A, which is still in a lot of working systems and can still be repaired and recharged. The refrigerants aren't interchangeable, so a new R-454B or R-32 outdoor unit needs an indoor coil built for that refrigerant.
Heat pumps and mini-splits
What is a dual-fuel system?
A dual-fuel system is a heat pump paired with a gas or propane furnace. The heat pump heats the house until the outdoor temperature drops below a switchover point set at install, then the furnace takes over. In summer the heat pump is your air conditioner. It's a common way to add a heat pump to a home that already has a good furnace, and it keeps a flame-fired backup for the coldest weeks. See our dual-fuel guide.
Maintenance and air quality
What happens during a furnace tune-up?
A proper furnace tune-up goes after the parts behind most winter no-heat calls. That means checking and cleaning the flame sensor, checking the igniter, inducer motor and pressure switch, inspecting the burners and heat exchanger, checking gas pressure and temperature rise, clearing the condensate trap on a high-efficiency furnace, looking over the venting and checking the filter. See our fall checklist.
How often should I change my furnace filter?
Filter life depends on the filter: usually every one to three months for a 1-inch filter and six months to a year for a deep media filter. Check it monthly. Our filter guide has the details, and maintenance and tune-ups covers what we check on the furnace.
Heating and cooling questions, answered
Every question below has a full guide behind it. The short answer is here; the guide has the steps, the costs and the Minnesota detail.
Heating
- Can a furnace leak carbon monoxide? Yes, a gas, propane or oil furnace can leak carbon monoxide through a cracked heat exchanger, a blocked or disconnected vent, or backdrafting.
- How do I clear a frozen furnace vent pipe? To clear a frozen furnace vent pipe, turn the thermostat off, clear snow from the PVC pipes and warm ice with a hair dryer, never a torch.
- How do I find out how old my furnace or AC is? To find a furnace or AC's age, look on the data plate inside the cabinet or on the outdoor unit for a printed manufacture date.
- How do I fix a frozen condensate line on my furnace? To fix a frozen furnace condensate line, turn the thermostat off and thaw the section in cold space with a hair dryer on low or warm towels, never a torch.
- How do I know if my furnace heat exchanger is cracked? A technician, not the homeowner, confirms a cracked furnace heat exchanger with a camera view, flame behavior and carbon monoxide readings.
- How does HVAC zoning work, and is it worth it in a Minnesota home? In Minnesota, zoning is worth it for two-story homes, finished basements and rooms over garages. Each zone gets its own thermostat, and a zone panel opens motorized dampers for the zone calling.
- How long does a furnace last in Minnesota? Most gas furnaces last about 15–20 years, according to Carrier and Lennox, and ENERGY STAR suggests considering replacement past 15.
- How long does a furnace replacement take? A straight furnace swap in Minneapolis, Saint Paul or the suburbs is usually a one-day job; Lennox puts a like-for-like replacement at 4–6 hours.
- How much does it cost to convert from oil to natural gas heat? An oil-to-natural-gas conversion typically costs $6,000–$20,000, per HomeGuide's national range. It runs $6,000–$12,000 when a gas line already reaches the house and $12,000–$20,000 when one must be run.
- How much does it cost to heat a Minnesota home with propane? At an example $3.00 a gallon, propane heat costs about $34 per million BTU on a 96% furnace and $41 on an 80% one. The formula is price per gallon ÷ (0.0915 × furnace efficiency).
- How much does it cost to run a gas line for a furnace or garage heater? A gas line for a furnace or garage heater costs $350–$2,000 nationally, per HomeGuide. Extending a line to a nearby appliance runs about $350–$800 and a new line from the meter $500–$2,000.
- Is a 98% AFUE furnace worth it over a 96% furnace in Minnesota? In Minnesota, a 98% AFUE furnace rarely pays back over a 96% model on gas savings alone; it cuts gas use only about 2%, while 80% to 96% cuts it about 17%.
- Is a Bryant Evolution furnace worth it over a Legacy? A Bryant Evolution 987M is worth the extra over a Legacy furnace for steadier, quieter heat, not gas savings; our furnaces run $4,500–$9,500.
- Is an outdoor wood boiler cheaper than a gas furnace in Minnesota? Where natural gas reaches the house, an outdoor wood boiler rarely beats a 95%-plus gas furnace once bought cordwood or labor counts.
- Is radiant floor heating better than baseboard heat in Minnesota? Radiant floor heat usually beats baseboard in Minnesota slabs, basements and additions, with more even comfort and cooler boiler water.
- Should a Saint Paul home with a boiler switch to a furnace? Keep a Saint Paul boiler if the radiators and piping are sound; our furnaces run $4,500–$9,500 and HomeGuide puts gas boilers at $4,000–$9,000.
- Should I buy a Trane or a Carrier furnace in Minnesota? Either brand makes a good furnace for a house, so pick the tier and installer first and the brand last. Both sell single-stage, two-stage and modulating models, $4,500–$9,500 installed with us.
- What do furnace noises mean? Each furnace noise points to one part: a startup bang is delayed ignition, a squeal a worn motor, scraping a loose blower wheel.
- What do Goodman furnace error codes and blinking lights mean? Goodman and Amana furnaces show error codes such as E0 or E1 on the control board display, and older boards flash an LED.
- What do Lennox furnace error codes and blinking lights mean? A Lennox furnace reports faults as DS1 and DS2 LED flash patterns on its control board and as numbered alerts on S30 thermostats, such as 223 for a low pressure switch open and 250 for a primary limit open.
- What do Rheem and Ruud furnace error codes mean? Rheem and Ruud 801T furnaces flash codes such as 11 failed ignition, 22 limit open and 33 rollout open, per Rheem's installation instructions.
- What do the blinking light codes on a Carrier furnace mean? A Carrier furnace flashes a two-digit LED code, and our Twin Cities $79 trip charge is waived with an approved repair. Short flashes give the first digit, long flashes the second.
- What do Trane and American Standard furnace error codes mean? Trane and American Standard furnaces flash 2 for lockout, 3 for a pressure switch and 4 for an open limit, per Trane's guide 18-CH111D1-1A.
- What do York furnace error codes mean? On the York TM9E, slow green or amber flashing is normal; 2 and 3 red are pressure switch faults, 4 red an open limit and 5 red an open rollout.
- What does a boiler expansion tank do, and how do you know it's failing? A boiler expansion tank gives the water in a closed hot-water system room to grow as it heats, keeping pressure below the relief valve setting.
- What does a furnace pressure switch do, and why does it keep tripping? A furnace pressure switch confirms the inducer is pulling exhaust out the vent before the gas valve opens. In winter it trips when snow covers the PVC vents, the condensate trap freezes, a hose cracks or the inducer weakens.
- What does it mean when a furnace is red-tagged? A red-tagged furnace was judged unsafe by a gas utility worker or technician, who shut off its gas and tagged it. Common causes are a cracked heat exchanger, carbon monoxide, a failed vent or a gas leak.
- What does the blinking light on my furnace mean? A blinking furnace light is a fault code from the control board, so match the flash pattern to the chart on the furnace door.
- What furnace problems are common in Prescott, WI homes, and what's different in Wisconsin? In Prescott, WI, homes outside the gas mains burn propane, so an empty tank is a common no-heat cause. A furnace that was under water must be inspected before it runs, and Wisconsin's Focus on Energy and CO alarm rules differ from Minnesota's.
- What is a communicating HVAC system, and is it worth it? A communicating HVAC system links the thermostat, furnace and outdoor unit by two-way data to fine-tune staging, airflow and humidity.
- What is a furnace inducer motor, and what are the signs it's failing? A furnace inducer motor is the small fan that runs first at startup, pulling exhaust through the heat exchanger and out the vent.
- What is a Manual J load calculation, and why should an HVAC quote include one? A Manual J load calculation is ACCA's standard method for working out how much heat a house loses on a cold design day and gains on a hot one.
- What is an orphaned water heater, and why can a new furnace mean a chimney liner? An orphaned water heater is a gas water heater left venting alone into a chimney it shared with an 80% furnace. In older Minneapolis and Saint Paul houses, a new 90%+ furnace moves to PVC, the flue runs cold, and the usual fix is a liner, about $1,500–$4,000 nationally.
- What is static pressure in HVAC, and why does it matter? Static pressure is the resistance a furnace blower pushes against through the filter, coil and ducts. Above the rating plate's range, airflow drops: weak rooms, limit trips and frozen coils.
- What is the best furnace brand for a Minnesota winter? A well-installed condensing furnace with two-stage or modulating burners and a variable-speed blower beats any badge, and ours run $4,500–$9,500.
- What is the best garage heater for a Minnesota winter? For an insulated garage you heat often, a vented gas unit heater is usually best, at $500–$2,000+ installed per HomeGuide.
- What is the quietest gas furnace for a Minnesota home? The quietest gas furnaces are modulating, variable-speed models like the Lennox SLP99V, Carrier Infinity 98 and Trane XC95m, $6,500–$9,500 installed with us.
- What should I check when my furnace stops heating in winter? When the furnace stops heating, check in order: thermostat mode and batteries, the breaker, the furnace switch, the filter, the lower door, the outdoor PVC vents and the condensate drain, then count the board's blink code and reset once.
- What should I set my thermostat to in a Minnesota winter? Set a Minnesota thermostat to about 68–70°F while you're home and awake, per the Department of Energy, and lower it while you sleep or are away.
- What size furnace do I need for a Minnesota house? A Minnesota furnace is sized from a Manual J heat loss at the winter design temperature, -15°F for Minneapolis–Saint Paul in the state energy code.
- Which is better for a Minnesota home: Carrier, Trane or Lennox? Carrier, Trane and Lennox build equally capable premium systems, so compare the same tier. At the top (Infinity, Premier, Signature) the furnace, outdoor unit and thermostat lock to one brand's communicating control.
- Which Lennox furnace series is best for a Minnesota home? For most homes, pick a two-stage Lennox with a variable-speed blower at 96–97% AFUE, such as the EL296V, EL297V or ML297V.
- Why does my furnace keep turning on and off? A furnace that short cycles is usually losing flame to a dirty sensor, tripping its limit on poor airflow, or oversized for the house.
- Why does my furnace limit switch keep tripping? A furnace limit switch trips when airflow is too low: a clogged filter, closed registers, a blocked return, a dirty AC coil or a weak blower.
- Why does my furnace smell like burning? A furnace burning smell in Minneapolis is usually dust burning off on the first cold days. Hot plastic, electrical or fishy means overheating: shut the furnace off.
- Why is my boiler banging or making a kettle noise? Kettling in a hot-water boiler is water flashing to steam from scale, sludge or weak flow, and repairs carry a $79 trip charge, waived on approval.
- Why is my furnace blowing cold air? A furnace most often blows cold air because the fan is set to On or the burners shut off mid-cycle. Check for a clogged filter tripping the limit, a dirty flame sensor, or a snow-blocked vent or frozen drain.
- Why is my furnace leaking water, and why is there water under my furnace? A furnace leaks water when a drain path is blocked. On a 90%+ furnace, a clogged condensate trap, dead pump or frozen drain leaks at the bottom; humidifiers leak any season, and in summer the AC coil is the usual source.
- Why is my thermostat screen blank, and is the furnace or AC still working? A blank thermostat screen almost always means lost power: dead batteries, a switch or breaker off, a blown board fuse or a tripped condensate switch.
- Why won't my furnace ignite? A furnace won't ignite when one startup step fails, and the step where it stops points to the part. No inducer means power or the thermostat; inducer without glow, a blocked vent or trap; glow without flame, gas or the gas valve; flame that drops out, the flame sensor.
Cooling
- Does the furnace need to be on for the AC to work? Central AC needs the furnace switched on, though its burners stay off, because the furnace blower moves air across the coil.
- How can I tell if my AC evaporator coil is leaking? A leaking evaporator coil shows up as long AC run times without cooling, ice on the larger copper line and a refrigerant top-up every summer.
- How do I clear a clogged AC condensate drain? Turn the cooling off, find where the water comes from, then flush the line through the cleanout tee or vacuum the clog out at the far end of the pipe.
- How do you figure out what size central air conditioner a Twin Cities home needs? Size a central air conditioner with a Manual J load calculation, not square footage or the old nameplate. Manual J weighs walls, windows, insulation, air leakage and sun exposure room by room.
- How long does a central air conditioner last in Minnesota? Most central air conditioners last about 15–20 years, according to Carrier and Lennox, and ENERGY STAR suggests evaluating replacement past 10.
- How many tons of AC do typical Minneapolis house styles need? AC tonnage for a Minneapolis home comes from a Manual J load calculation, not square footage, and installed central AC runs $5,200–$9,800.
- Is a high-velocity air conditioning system a good choice for an older Minnesota home without ducts? In an older Minneapolis or Saint Paul boiler house, high-velocity AC cools the whole house without wall heads or big new ducts.
- Is a two-stage or a variable-speed air conditioner better for a Minnesota home? A two-stage AC is the better value for most homes in our $5,200–$9,800 installed range: it runs on low most of the summer and pulls more humidity out.
- Is Rheem or Goodman the better air conditioner for a Minnesota home? Neither is better outright: Goodman usually quotes lower at the same tier, and Rheem competes a step up, with either installed for $5,200–$9,800.
- Should a Minnesota home get a ductless mini-split or central air conditioning? In a home with a forced-air furnace and decent ducts, central AC ($5,200–$9,800 installed with us) usually wins. With no ducts, as in many boiler homes, or one room the ducts miss, choose a ductless mini-split ($4,200–$12,500), which also heats through much of winter.
- Should I repair or replace an R-22 air conditioner in Minnesota? Repair an R-22 AC for an electrical fault or a small, findable leak; replace it when the coil leaks, the compressor fails or no leak can be found.
- What are R-454B and R-32, and what does the refrigerant change mean for my AC? R-454B and R-32 are the mildly flammable (A2L) refrigerants in most new central air conditioners, replacing R-410A under EPA's AIM Act rules.
- What is SEER2, and how is it different from SEER? SEER2 is the seasonal cooling efficiency rating DOE has required since January 1, 2023. It measures what SEER did under a test with more duct resistance, so the same unit reads lower.
- What is the best central air conditioner brand for Minnesota? The best central AC for a Minnesota home is a correctly sized, matched system whatever the logo, and our installs run $5,200–$9,800.
- What should River Falls homeowners check with RFMU and the city before replacing an AC? Replacing central AC in River Falls, WI, costs $5,200–$9,800 installed with us, sized with a Manual J load calculation. Check River Falls Municipal Utilities and Focus on Energy programs first, and plan for the city's mechanical permit.
- What's the difference between Carrier Comfort and Performance air conditioners? Carrier's Comfort 16 and Performance 16 are both single-stage and list up to 16.5 SEER2; the Performance 16 is quieter (67 dB vs 71 dB).
- Why does my air conditioner smell like dirty socks? A dirty-sock smell usually means bacteria and mold on a damp indoor coil or drain pan, and an AC tune-up starts at $129.
- Why is my AC condenser humming? A hum with the fan stopped, or ending in a click, means a failed capacitor, seized fan motor or worn contactor: turn it off.
- Why is my AC freezing up, with ice on the lines or the indoor coil? An AC freezes up when the indoor coil drops below 32°F, from too little airflow or low refrigerant. Airflow causes are a clogged filter, closed registers or a weak blower.
- Why is my AC leaking water inside the house? A leaking AC means coil water can't reach the drain, and our $79 trip charge is waived when you approve the repair. Common causes are a clogged trap or line, a failed condensate pump, a frozen coil or a cracked pan.
- Why is my air conditioner running but not cooling the house? An AC that runs but won't cool usually has a clogged filter, iced coil, failed capacitor or leak; the $79 trip charge is waived on an approved repair.
- Why is the fan on my outdoor AC unit not spinning? A failed run capacitor, burned-out fan motor or bad contactor usually stops an outdoor AC fan; a capacitor swap runs $150–$400 nationally (HomeGuide).
- Why won't my air conditioner turn on? In Minneapolis, an AC that won't turn on usually has a power or control problem, and the $79 trip charge is waived when you approve the repair.
Heat Pumps
- Do heat pumps work in Minnesota winters? Yes. A cold-climate heat pump keeps heating below zero, but its output falls as it gets colder, so plan backup heat for the coldest nights: a gas or propane furnace (dual fuel) or electric strips.
- Do I need a Mitsubishi Hyper-Heat unit, or will a standard Mitsubishi heat pump do? Buy Hyper-Heat if a Minnesota mini-split must heat a room in January; Mitsubishi rates it to heat down to -13°F. A standard unit is fine where the room keeps other heat.
- Does a heat pump water heater make sense in a Minnesota basement? Often, yes, if the basement stays between 40°F and 90°F with about 1,000 cubic feet of air, as ENERGY STAR advises, and has a drain.
- How does a dual-fuel system decide when to switch from the heat pump to the furnace? A dual-fuel system switches from heat pump to furnace at an outdoor temperature you set. Pick the warmer of two points: where the heat pump stops keeping up, and where furnace heat gets cheaper at your rates.
- How should I lay out a multi-zone mini-split in my house? Give each closed-door room its own mini-split head, size every head to its room's load, then choose one outdoor unit or two.
- Is a ductless heat pump worth adding to a house heated by electric baseboard? In a Minnesota baseboard house, a ductless heat pump usually beats baseboard, making more heat per kilowatt-hour and adding AC, with the baseboards kept as backup.
- Is it normal for a heat pump to run constantly in winter? A Minnesota heat pump that runs almost constantly in winter is usually normal: inverter units run long and slow, and any heat pump runs nearly nonstop in a cold snap.
- Is the Daikin FIT a good heat pump for a Minnesota home? A Daikin FIT heat pump suits tight Minnesota side yards: slim, side-discharge and rated by Daikin to -10°F, or -20°F for the cold-climate FIT Aurora.
- Should a Minnesota house have a heat pump or a gas furnace? In a Minnesota house on natural gas, a heat pump plus a gas furnace, called dual fuel, usually beats either one alone. Installed with us, a ducted heat pump runs $7,500–$14,500 and a furnace $4,500–$9,500.
- Should I add a heat pump to my propane-heated house? Yes, for many rural Minnesota homes: a cold-climate heat pump beside the propane furnace (dual fuel) carries milder days and cuts gallons delivered.
- Should I replace my electric furnace with a heat pump? In most Minnesota homes, add a heat pump to an electric furnace rather than replacing it. The furnace becomes the air handler and backup, and the heat pump carries every hour it can, using less electricity per unit of heat.
- Should my mini-split head go high on the wall or low on the floor? Put a mini-split head high on the wall for cooling-first rooms and use a floor console for heating-first rooms, kneewall spaces and sunrooms.
- What are the most common mistakes when buying a heat pump in Minnesota? The most common Minnesota heat pump mistakes are shopping by SEER2 instead of heating capacity at 5°F, sizing from the old AC, skipping a backup-heat plan, ignoring ducts and the electrical panel, mounting the unit at ground level, and counting on the ended 25C credit.
- What do HSPF2 and COP mean on a heat pump, and which numbers matter in a Minnesota winter? HSPF2 is a heat pump's heating efficiency averaged over a season in one reference climate; COP is its efficiency at a single outdoor temperature.
- What does a heat pump actually do on a -20°F night in Minnesota? On a -20°F Minnesota night, a heat pump runs at reduced output or locks out, and the furnace or electric backup carries most of the load.
- What is the difference between aux heat and emergency heat on a heat pump thermostat? Aux heat is automatic backup that a heat pump thermostat adds, such as during defrost, after a big setpoint jump or on cold nights.
- Which Daikin or Mitsubishi head fits each room in a Minnesota house? Choose Daikin or Mitsubishi mini-splits room by room, because either brand fits our $4,200–$12,500 installed range. Use small quiet heads in bedrooms, cold-climate outdoor units for rooms that must heat in January, floor consoles for kneewall rooms and a separate single-zone unit for a porch.
- Why is my heat pump blowing cold air in winter? A heat pump blowing cool air in winter is often working: its air runs 85–100°F versus 120–140°F from a furnace, per Carrier.
- Why is my heat pump steaming and making noise in winter? A Minnesota heat pump that steams, whooshes and stops its outdoor fan is in a normal defrost cycle that melts frost off the coil.
Air Quality
- Are UV lights for HVAC worth it? A UV light is worth it when mold or slime grows on the wet AC coil and drain pan, the usual musty start-up smell, not for dust, pollen or germs.
- Do I need a whole-house dehumidifier in Minnesota? A Minnesota home likely needs a whole-house dehumidifier if the basement stays above 60% humidity in summer or smells musty.
- Does a home HVAC system need a duct smoke detector? Most Minnesota homes don't need a duct smoke detector; the code applies to return-air systems over 2,000 cfm. Every home does need working smoke alarms, plus carbon monoxide alarms within 10 feet of each sleeping room.
- Does central air conditioning bring in outside air? Central AC does not bring in outside air: the blower recirculates indoor air across the cold coil while the outdoor unit only sheds heat.
- How do I improve indoor air quality in a Minnesota house in winter? To improve indoor air in a Minnesota winter, fix moisture first, then filtration, then fresh air. Watch windows and a hygrometer, humidify only if the house is dry, use a 4- or 5-inch MERV 13 filter, ventilate tight houses and test for radon.
- Is air duct cleaning worth the money? Duct cleaning is worth it in Minnesota only for visible mold, rodents or insects, or debris blowing from registers, per the EPA.
- Is duct sealing worth it in a Minnesota house? Duct sealing in a Minnesota house pays when the leaks are in unheated space: attics, garages, crawlspaces and exterior walls.
- Is the Lennox PureAir S worth it? In a closed-up Minnesota house, Lennox PureAir S is worth it if odors and chemical smells bother you as much as dust. It pairs a MERV 16 filter with a UV and catalyst stage.
- Should a Minnesota house have an HRV or an ERV? A house that runs humid in winter, with sweating windows, needs an HRV; one that runs dry does better with an ERV, which keeps some moisture in.
- What is make-up air, and when does a kitchen range hood need it in Minnesota? Make-up air is outdoor air that replaces what a ducted kitchen hood blows out. Minnesota Rules 1346.0505 and 1346.0501 require it: in homes built before 1999 a hood rated over 300 cfm triggers it, and newer homes use a calculation whenever an exhaust system is installed or replaced.
- What MERV rating is best for allergies? MERV 13 is the best rating for most allergy households if the system can breathe through it; our air quality installs run $350–$2,800.
- What's the best whole-home humidifier for a Minnesota house? The best whole-home humidifier for most furnaces is a bypass unit with automatic control, and HomeGuide puts installs at a typical $400–$1,200.
- Where does Minnesota law require carbon monoxide alarms? Minnesota Statutes 299F.51 requires a working, approved CO alarm within 10 feet of every sleeping room, in every home and apartment unit.
- Which is better, the Aprilaire 5000 or an Aprilaire 2000-series air purifier? An Aprilaire 2000-series cabinet with a MERV 13 filter beats the electronic 5000 in most Minnesota homes; our air quality installs run $350–$2,800.
- Why is my furnace filter turning black? A black furnace filter usually means soot from candles, a fireplace or smoky cooking, and sometimes from a furnace burning dirty.
Maintenance
- Can you run a furnace without a filter? A furnace can run briefly without a filter, but weeks without one let dust coat the blower wheel, AC coil and heat exchanger.
- How do I clean a furnace flame sensor? To clean a furnace flame sensor in a Minnesota home, shut off power and gas, let it cool, remove the rod (one wire, one screw), rub it lightly with a fine abrasive pad, reinstall it and watch a cycle.
- How do I clean my outdoor AC unit's coils? To clean an outdoor AC coil in Minnesota, cut power at the disconnect and breaker, brush cottonwood fluff off dry and rinse gently with a garden hose, never a pressure washer.
- How often should you change your furnace filter in Minnesota? Check a 1-inch furnace filter monthly in heating and cooling season and change it when dirty, or at least every three months, as ENERGY STAR advises.
- Is Honeywell Home or Sensi better for a Minnesota home? For a Minnesota home with no C wire, Sensi Smart is the easier fit because it can power-share on a standard furnace and AC.
- Should I cover my outdoor AC unit in the winter? Do not cover an outdoor AC unit in a Minnesota winter: a plastic or vinyl wrap traps moisture and shelters mice, and the unit is built for snow.
- What HVAC maintenance does a Hudson, WI home need? A Hudson, WI home needs a fall furnace tune-up, a spring AC tune-up, filter changes and clear PVC vents between visits. Tight newer homes add air exchanger service.
- What is a thermostat C-wire and do I need one? The C (common) wire completes the furnace's 24-volt circuit so a thermostat gets steady power. Most smart thermostats need one, though some borrow power.
- What is included in a furnace inspection? A furnace inspection measures gas pressure, combustion, carbon monoxide, temperature rise, flame signal and safety switches instead of just glancing.
- What is the best place to put a thermostat? Put a thermostat on an interior wall in a lived-in central room, about 5 feet up, away from sun, supply registers, exterior doors and the kitchen.
- What is the best smart thermostat for a Minnesota home? The best smart thermostat for Minnesota is the one that fits your equipment, and HomeGuide puts installs at $225–$400. Ecobee Premium or a 4th-gen Nest Learning suits a problem room, Sensi or a power-sharing Nest suits a house without a C wire, and a communicating system needs the maker's own control.
- What should a spring AC tune-up include? A spring AC tune-up should rinse the coil, test the capacitor and contactor, check refrigerant charge and amp draws, and check airflow and drain.
- What should I do to get my furnace ready for winter? A fall furnace checklist covers the furnace switch, gas shutoff, filter, vents, condensate drain, CO alarms, humidifier and a mild-day test run.
- What smells and noises are normal when I turn on my furnace for the first time in the fall? On a furnace's first fall start, expect a dusty smell that fades over a few cycles, ticking ducts and a few seconds of cool air.
- Why is one room in my house always colder or hotter than the rest? One room runs hotter or colder because it gets too little air or gains and loses heat faster than the rest. Likely causes are a blocked register, no return path, a dirty filter, a closed damper, leaky ducts or a room over a garage.
Pricing
- Do I need a permit to replace a furnace or AC in Minneapolis or Saint Paul? In Minneapolis and Saint Paul, replacing a furnace, boiler, central AC or heat pump needs a city permit, which the installing contractor normally pulls from CPED in Minneapolis or the Department of Safety and Inspections in Saint Paul.
- How do I choose an HVAC contractor in Minneapolis? Choose a Minneapolis HVAC contractor that has a mechanical contractor bond on file with the state Department of Labor and Industry, holds the city license, and gives a written quote based on a Manual J load calculation with the permit listed.
- How long does a higher-SEER2 air conditioner take to pay back in Minnesota? In Minnesota, a high-efficiency AC usually takes longer to pay back than the equipment lasts, because the cooling season is short.
- How much does a Carrier Infinity heat pump cost in Minnesota? A Carrier Infinity heat pump usually lands in the upper part of our $7,500–$14,500 installed heat pump range. It is a variable-speed system with a matched indoor unit and a communicating control.
- How much does a geothermal heat pump cost in Minnesota? A geothermal heat pump system costs $20,000–$50,000+ nationally before incentives, per HomeGuide. The ground loop drives most of the spread.
- How much does a Mitsubishi mini-split cost in Hudson, WI? A Mitsubishi ductless mini-split installed by us in Hudson, WI runs $4,200–$12,500, the same as on the Minnesota side. A single-zone unit sits toward the low end and multi-zone Hyper-Heat systems toward the top.
- How much does a new boiler cost in Minnesota? HomeGuide puts a typical gas boiler replacement at $4,000–$9,000 nationally and a high-efficiency boiler at $4,000–$10,000.
- How much does furnace repair cost in Minnesota? Furnace repair with us starts with a $79 trip charge, waived when you approve the repair, then a written flat-rate price before work begins.
- How much does it cost to install a heat pump in Minnesota? A ducted heat pump installed by Central Minnesota Heating & Cooling costs $7,500–$14,500 and a ductless mini-split $4,200–$12,500.
- How much does it cost to recharge an AC with refrigerant? An AC recharge costs $50–$80 per pound for R-410A and $90–$150 per pound for R-22, per HomeGuide's national figures, about $100–$320 for a typical R-410A top-off.
- How much does it cost to replace a central air conditioner in Minnesota? A central AC replacement costs $5,200–$9,800 installed with us. A modest single-stage system reusing a line set sits near the bottom; a larger two-stage or variable-speed system with a new line set, pad or circuit sits near the top.
- How much does it cost to replace a furnace blower motor? A furnace blower motor costs $500–$1,400 for a PSC motor and $800–$2,300 for an ECM variable-speed motor, per HomeGuide's national guide.
- How much does it cost to replace a furnace in Minnesota? A new furnace installed by us costs $4,500–$9,500: roughly $4,500–$6,000 for an 80% AFUE model and $6,500–$9,500 for a 96–98% condensing one.
- How much does it cost to replace an AC capacitor? Replacing an AC capacitor typically costs $150–$400, per HomeGuide's national range, even though the part itself runs about $15–$80.
- Is a tankless water heater worth it in Minnesota? Tankless pays off in Minnesota when you run out of hot water and the house can take the bigger gas line and vent; otherwise a tank swap costs less.
- Is ductless or central air cheaper to install? Central AC ($5,200–$9,800 with us) costs less to install in a house with ducts, and ductless ($4,200–$12,500 with us) costs less without them.
- What does it cost to replace the furnace and AC together in Minnesota, and is it cheaper than doing them separately? Replacing a furnace and AC together costs $9,700–$19,300 installed with us, our two ranges added. When both are near the end, one project usually costs less than two, because the coil, sheet metal and startup happen once and the system is matched.
Rebates
- Are the federal HVAC tax credits from the Inflation Reduction Act gone, and what's left for Minnesota homeowners? The federal 25C and 25D tax credits ended for equipment placed in service after December 31, 2025, and Minnesota's HEAR and HOMES rebates haven't launched.
- How do CenterPoint Energy's furnace rebates work in Minnesota in 2026? CenterPoint Energy pays Minnesota gas customers a rebate for a qualifying high-efficiency furnace or boiler, and the amount steps up by AFUE tier.
- Is Xcel Energy's AC Rewards program worth joining? Xcel Energy's AC Rewards is worth joining for most Minnesota single-family homes with central air and an eligible smart thermostat.
- What heat pump rebates are available in Minnesota in 2026? In 2026, Minnesota heat pump rebates come from utilities such as Xcel Energy, CenterPoint Energy, Dakota Electric and Connexus.
- What HVAC rebates and programs are available to Dakota County homeowners? Dakota County HVAC rebates come from your utilities, not the county. Dakota Electric or Xcel Energy covers AC and heat pumps, and CenterPoint Energy, Xcel or Minnesota Energy Resources covers furnaces, depending on your address.
- Which Xcel Energy and CenterPoint Energy rebates apply to my HVAC project in 2026? In Minnesota for 2026, furnace rebates come from your gas utility and AC and heat pump rebates from your electric utility.