Start with what's bothering you
Most air complaints in a Minnesota house come down to four things: too little moisture in winter, too much in summer, dust you can see on the furniture, and stale air in a house that no longer leaks. Each one has its own equipment, and the wrong one makes things worse. A humidifier in a house whose windows already sweat adds water where there's too much. A MERV 16 filter on a furnace that's short of return air costs you airflow and comfort.
EPA puts the order simply: reduce or remove the sources, ventilate with clean outdoor air, and treat filtration as a supplement to those two. We work the same way. Before anyone sells you a box, an inexpensive hygrometer, a week of looking at your windows and a look at the furnace filter will usually tell you where to begin. Our winter air quality guide walks through that checklist step by step.
Match the symptom to the fix
This is how we sort calls when someone says the air in their house feels wrong.
| What you notice | Likely cause | What we'd do |
|---|---|---|
| Static shocks, dry skin, gaps in the hardwood in January | Heated winter air holding too little water | Whole-house humidifier with an outdoor-sensing control |
| Water or frost on the inside of the windows | More moisture than the glass can take, often in a tight house | Turn the humidity down, run exhaust fans, then look at an HRV or ERV |
| Musty basement from June to September | High humidity below grade, where the AC rarely runs | Whole-house dehumidifier on its own humidistat |
| A film of dust on dark surfaces soon after cleaning | Thin filter, air slipping around it, or leaky return ducts | 4- or 5-inch MERV 13 media cabinet and sealed returns |
| Musty smell each time the AC starts | Growth on the wet AC coil or drain pan, or a plugged drain | Clear the drain and clean the coil; a coil UV lamp if it keeps coming back |
| Stale air and cooking smells that linger | A tight house with no planned air exchange | HRV or ERV, sized and balanced |
| Furnace filter turning black | Usually soot: candles, wood smoke, or a burner running dirty | Check the furnace, water heater and boiler before buying an air cleaner |
Notice how often the fix is a setting, a drain or a filter rather than new equipment. We'll tell you when that's the case.
The four kinds of equipment we install
Whole-house humidifiers
A humidifier mounts on the furnace and adds water to the air as the blower moves it through the ducts. Bypass models suit most gas furnaces, while steam suits heat pump and dual-fuel homes and big houses. The real limit is your window glass, which is why we set them up with a control that follows the outdoor temperature. Types, settings and prices are on our humidifier page, and our humidifier guide compares models.
Whole-house dehumidifiers
A dehumidifier pulls water out of basement air in summer on its own humidistat, whether the AC is running or not. EPA suggests holding indoor humidity under 60 percent, and ideally in the 30 to 50 percent range. Liquid water coming through the walls after a storm is a drainage problem it can't solve. See dehumidifiers and our guide to whole-house dehumidifier installation.
Filtration, air cleaners and UV
A deep media cabinet holding a MERV 13 filter does the heavy lifting for dust, pollen and dander, and it needs no power. Electronic and polarized-media cleaners add a powered assist and more upkeep. A UV lamp keeps the AC coil clean but catches no dust at all. The air purification page compares them side by side, and our MERV rating guide and UV light post go further.
HRV and ERV ventilation
A ventilator exhausts stale indoor air, brings in the same amount of outdoor air, and recovers heat from what it sends out. An ERV also holds back some moisture. Houses built under Minnesota's current energy code need balanced ventilation, and older houses can need it once they're air-sealed. See ventilation and ERV vs HRV.
Minnesota houses and their air
- A long, sealed heating season. From November into April the windows stay shut, and everything the household makes stays inside with you: shower steam, cooking smoke, pet dander, dust.
- Dry winters with a ceiling. The colder the night, the less humidity the window glass will tolerate: roughly 25–35% in cold weather and lower in deep cold, or water and frost collect on the glass.
- Radiator houses. Plenty of older Minneapolis and Saint Paul homes run on a boiler and cast-iron radiators with no ductwork anywhere, so furnace-mounted humidifiers, media cabinets and ducted ventilators don't apply. Room humidifiers and portable HEPA units do. Our Saint Paul boiler page covers the heating side of those houses.
- Tightened older houses. New windows, spray foam or an insulation and air-sealing job through Xcel Energy or CenterPoint Energy can leave a 1950s house tighter than its ventilation. Watch the windows the first winter after.
- Humid Julys and smoky summers. Dew points in the 60s and 70s call for a dehumidifier in many basements, and Canadian wildfire smoke calls for a good filter and the blower running.
- Snow and combustion safety. Drifts can bury ventilator hoods and the plastic vent pipes of high-efficiency furnaces. Minnesota law requires a working carbon monoxide alarm within 10 feet of every sleeping room; our CO alarm guide covers placement.
- Radon. The gas seeps in from the ground under the house, so no furnace add-on touches it. The Minnesota Department of Health recommends testing every home, and if a test comes back high, mitigation is separate specialty work.
How does an air quality visit work?
- Tell us what you're noticing. Call or use the form: dry air, wet windows, a musty basement, dust, smoke or smells.
- We measure before we recommend. Humidity, static pressure in the ductwork, the filter slot and return, and where water, drains and power can go.
- You get options in writing. A flat-rate quote for the equipment that fits, and a plain note when a cheaper fix, like a filter, a setting or a cleared drain, solves it.
- We install and set it up. Controls configured for the season, airflows measured on ventilators, and a walk-through of filters, pads and drains.
- Repairs follow the same rules. A $79 trip charge, waived when you approve the repair, a written price before work, and a written 1-year parts-and-labor warranty on the repair.
How much does air quality work cost?
Air quality equipment runs $350–$2,800 installed. A media filter cabinet or a UV lamp sits near the low end; a steam humidifier, a whole-house dehumidifier or a ventilator moves toward the top. Every job gets a written flat-rate quote before work starts, and installs carry a 2-year labor warranty on top of the manufacturer's parts warranty. Prices are the same in every town we serve, with no mileage charge.
National cost guides give useful context, and they are not our prices. HomeGuide's typical installed ranges are $400–$1,200 for a whole-house humidifier, $400–$800 for a media filter cabinet and $1,500–$3,500 for a whole-house dehumidifier. Fixr and Trane put a typical HRV or ERV tied into existing ductwork at about $1,300–$2,500.
Our full list of installed ranges is on the pricing page, and HVAC costs in Minneapolis covers furnaces, air conditioners and heat pumps. If a furnace replacement is coming, price the air quality equipment with it; our furnace replacement cost guide covers that side.
Upkeep that keeps it working
Air quality equipment fails quietly. A humidifier with a crusted water panel still clicks on, a UV lamp keeps glowing long after it stops doing much, a dehumidifier drain that plugs leaves water on the floor, and a ventilator with a clogged core just moves less air. Two short visits a year cover it:
- Fall: a new humidifier water panel, the bypass damper open and the water on; ventilator filters and core cleaned and the outside hoods cleared; a fresh furnace filter.
- Spring: the humidifier damper closed and the water off; the dehumidifier drain and filter checked; the UV lamp replaced on the maker's schedule; a fresh filter for cooling season.
Tune-ups start at $129 for the furnace or the AC and run $219 for both, and that visit is the natural time to handle these. Ask us about a maintenance plan so it happens every year; see maintenance.
What's included with indoor air quality?
- A humidity reading and a look at your windows, basement and filter before we recommend anything
- Static pressure and return ductwork checked before any filter upgrade
- Equipment sized to the house: humidifier output, dehumidifier pints per day, ventilator airflow
- Water, drain and electrical connections run and tested
- Controls set up, including outdoor-sensing humidifier controls
- Ventilator supply and exhaust airflows measured and balanced
- 2-year labor warranty on installs, plus the manufacturer's parts warranty
Indoor Air Quality questions
Where should I start if I don't know what's wrong with my air?
With an inexpensive hygrometer and a week of paying attention. Note the humidity on the coldest mornings, look at the inside of the window glass, check how fast dust returns to dark furniture, and notice whether the basement smells musty. Wet windows point to ventilation, static and dry skin to a humidifier, a musty basement to a dehumidifier, and fast-returning dust to filtration or leaky return ducts.
Can one piece of equipment fix everything?
No. Each piece does one job. A humidifier adds moisture, a dehumidifier removes it, a filter catches particles, and an HRV or ERV trades stale air for outdoor air. None of them covers for the others, and a couple can work against each other, like a humidifier running while the windows sweat. We'd rather solve the one problem you have than sell you a basement full of boxes.
Do you work on equipment someone else installed?
Yes. We service humidifiers, dehumidifiers, air cleaners, UV lamps and ventilators of any brand, including Aprilaire, Honeywell Home, Broan-NuTone, Lifebreath and Santa Fe, no matter who put them in. A repair visit is a $79 trip charge, waived when you approve the repair, and you get a written price before we start. Common fixes are stuck solenoid valves, clogged drains, failed condensate pumps and iced ventilator cores.
Is duct cleaning part of improving indoor air quality?
Less often than the mailers suggest. According to EPA, cleaning ducts hasn't been shown to prevent health problems, and it's worth paying for only in specific cases, such as heavy visible mold inside hard ductwork, mice or insects, or so much debris that it puffs out of the registers. For ordinary dust, a deep media filter, sealed return ducts and a clean blower and coil do more for the money.
Will air quality equipment raise my utility bills?
Some of it, by a little. A media filter cabinet uses no power at all. A bypass humidifier borrows heat the furnace already made, while a steam humidifier boils water with electricity. A dehumidifier runs a compressor through the humid months, and a ventilator runs two fans and loses the share of heat its core can't recover. Running the furnace fan nonstop for filtration adds blower electricity too.
Should I add air quality equipment when I replace my furnace?
It's the easiest time to do it. The return and supply plenums get rebuilt during a furnace replacement anyway, so a media filter cabinet, a humidifier or a ventilator connection goes in with less extra sheet metal than it would later. Tell us what bothers you about your air before we quote the furnace, and we'll price the options separately so you can pick.
Do utilities give rebates on air quality equipment?
Rarely. In 2026, Xcel Energy's and CenterPoint Energy's home programs center on furnaces, boilers, heat pumps, air conditioners, thermostats, water heaters and insulation, not humidifiers or air cleaners. Electric co-ops and city utilities run their own lists, and every program changes from year to year, so look at your utility's program page before counting on money back. We never quote rebate amounts.
Sources
- HomeGuide cost guides (2026 editions) homeguide.com
- Minnesota Department of Health health.state.mn.us
- U.S. Environmental Protection Agency epa.gov