How Often Should You Change Your Furnace Filter in Minnesota?
Check a 1-inch furnace filter monthly and change it at least every 3 months; deep media filters last longer. Pets, smoke and a fan left on shorten it.
Read the guideMaintenance Guides
Tune-ups, thermostats and the small jobs that keep equipment running longer.
Most breakdowns we see started months earlier as something small: a dirty flame sensor, a clogged condensate drain, a weak capacitor or a filter nobody changed. These guides cover what you can check yourself before each season, what a technician's tune-up actually includes, and how thermostats, zoning and placement affect comfort from room to room.
Our tune-ups are $129 for a furnace or an air conditioner and $219 for both, and maintenance plans are available on request. See maintenance and tune-ups and thermostats and zoning.
Can You Run a Furnace Without a Filter? What Happens and What to Do
A few hours without a furnace filter won't hurt much; weeks can. What dust does to the blower, AC coil and heat exchanger, a safe stopgap and the right size.
Read the guideTurning the Furnace On for the First Time This Fall
Turning the furnace on for the first time this fall? What to do first, which smells and sounds are normal, and the filter, humidifier and CO alarm steps.
Read the guideBest Place for a Thermostat, and the Spots That Read Wrong
Where a thermostat belongs in a Minnesota house, the 7 spots that give false readings, a simple test for yours, and when moving it beats a smarter model.
Read the guideHow to Clean Your Outdoor AC Coil Without Damaging It
Clean your outdoor AC coil the safe way: power off at the disconnect and breaker, brush cottonwood off dry, rinse with a garden hose, and know when to stop.
Read the guideWhat a Furnace Inspection Covers, and Why Each Check Matters
What a technician checks on a furnace inspection in Minnesota, from gas pressure and combustion to the heat exchanger, and what each reading tells you.
Read the guideHVAC Zoning in Minnesota Homes: When It Works and When It Doesn't
HVAC zoning gives each floor its own thermostat using dampers on one furnace and AC. Which Minnesota houses it suits, where it falls short, and what it costs.
Read the guideHow to Clean a Furnace Flame Sensor Safely
Burners light, then shut off after a few seconds? How to shut the furnace down safely, clean the flame sensor, and when to stop and call a technician instead.
Read the guideThermostat C-Wire: What It Does and How to Add One
What a thermostat C-wire does, whether your smart thermostat needs one, how to find a spare wire in the wall, signs of low power, and what adding one costs.
Read the guideSpring AC Tune-Up Checklist for Minnesota Homes
What to check on your AC each spring in Minnesota, what a technician's AC tune-up covers and why, and how to time it around cottonwood season. $129 tune-up.
Read the guideShould You Cover Your AC Unit in a Minnesota Winter?
Why a plastic cover does more harm than good on a Minnesota AC, when a plywood top makes sense, fall prep steps, and why a heat pump should never be covered.
Read the guideHoneywell Home vs Sensi Thermostats: Which Fits Your System
Honeywell Home X2S and X8S vs Sensi Lite, Smart and Touch 2: C-wire needs, heat pump staging, humidity control, room sensors and Xcel AC Rewards lists.
Read the guideSmart Thermostats for Minnesota Weather: What Matters Here
Ecobee, Google Nest, Honeywell Home and Sensi compared on what matters in Minnesota: heat pump backup heat, winter humidity, room sensors and C-wire needs.
Read the guideWhy One Room Is Always Hotter or Colder, and How to Fix It
Why one room in a Minnesota house stays too hot or too cold, a symptom-to-fix table, and the order we check registers, returns, filter, dampers and ducts.
Read the guideHVAC Maintenance for Hudson, WI Homes: A Season-by-Season Guide
Furnace and AC upkeep for Hudson, WI homes: a season-by-season checklist, Wisconsin programs, older river-town houses vs post-2000 builds, and tune-up prices.
Read the guideFall Furnace Checklist: What You Can Do Yourself Before Winter
A homeowner's fall furnace checklist for Minnesota: filter, furnace area, PVC vents, condensate drain, CO alarms, humidifier, propane and a test run.
Read the guideMaintenance questions
How often should my furnace and AC be serviced?
Once a year each: the furnace in the fall before the first cold snap, the air conditioner in spring before the heat. A furnace or AC tune-up starts at $129, or $219 for both in one visit. A heat pump runs in both seasons and piles up more hours than a furnace or AC alone, so a yearly check matters even more. More on maintenance.
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?
Check it monthly during heating and cooling season. A standard 1-inch filter usually needs changing every one to three months, sooner with pets or during a remodel. A 4- or 5-inch media filter in a cabinet by the furnace typically lasts six months to a year. If you hold it up to a light and can't see through it, change it. A clogged filter can trip the furnace's limit switch.
What indoor humidity should I keep in winter?
Lower as it gets colder outside. Roughly 25–35% works in normal cold weather, and in deep cold it needs to come down further or your windows will sweat and frost over. Water or ice on the inside of the glass is the sign it's too high. A whole-home humidifier with an outdoor temperature sensor adjusts for this on its own. See our humidifier guide.
Where do carbon monoxide alarms need to go?
Minnesota law requires a working carbon monoxide alarm within 10 feet of every room used for sleeping. Adding one on each level, basement included, is a good idea in a house with gas or propane appliances. CO has no smell, and a cracked heat exchanger, blocked flue or backdrafting water heater can produce it. Replace alarms by the date printed on them. Details are in our CO alarm guide.
Do I need an HRV or ERV?
If your house is newer and built tight, it probably already has one, since mechanical ventilation is part of how newer Minnesota homes are designed. Older, leakier houses usually don't need one unless they've been heavily air-sealed. An HRV swaps heat between outgoing and incoming air and tends to dry a house out a little, which helps with sweating windows. An ERV also moves some moisture. See HRV vs ERV.
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