HVAC questions for Minnesota homes, answered.

Leave the house right away and take everyone with you. Don’t flip light switches, use the thermostat, start a car in an attached garage or use your phone until you’re outside and away from the house.

From outside, call your gas utility’s emergency line (for most north-metro homes that’s CenterPoint Energy) or 911. Don’t go back in until they say it’s safe. Once the leak is handled, we can repair or replace the appliance involved.

Get everyone, including pets, out into fresh air and call 911 from outside. Don’t open windows and stay in, and don’t try to find the source yourself.

Carbon monoxide has no smell, and early symptoms (headache, dizziness, nausea) are easy to mistake for the flu. After the fire department clears the house, have the furnace, boiler, water heater and venting inspected before you run them again. Minnesota law requires a working CO alarm within 10 feet of every sleeping room.

Call us at (763) 291-1615; we offer 24/7 emergency service. While you wait, you can check the simple things: the thermostat is set to heat with fresh batteries, the furnace switch is on, the breaker hasn’t tripped and the filter isn’t clogged.

Don’t remove panels or work on the burner, gas valve or wiring. Never use the oven, a grill or a camp heater indoors for heat. If you use a portable electric space heater, keep it well clear of anything that can burn and plug it straight into the wall. Open cabinet doors under sinks on outside walls to help keep pipes from freezing.

No heat in freezing weather, a gas smell, a CO alarm, a boiler leaking or making loud banging noises, burning or electrical smells from the furnace, and no cooling during a heat wave when someone in the home is elderly, very young or medically vulnerable.

For gas or CO, get out and call from outside first. For the rest, call us any time at (763) 291-1615.

A dusty, burning smell for a few minutes the first time the heat runs in fall is usually dust burning off the heat exchanger and is normal. A smell that lingers, smells electrical or like hot plastic, or comes with smoke is not.

If it lingers or smells electrical, turn the furnace off at the thermostat and its switch and call us. If there’s smoke or fire, get out and call 911.

You don’t need to. Condensers are built to sit outside through a Minnesota winter. A full plastic cover can trap moisture and invite rodents to nest inside.

If you want to keep icicles or falling debris off the top, a piece of plywood or a breathable top-only cover is fine. Just remember to remove it before you turn the AC on in spring.

A well-maintained gas furnace commonly lasts 15–20 years and a central air conditioner about 12–15 years, though age alone isn’t a reason to replace.

Our long heating season puts more hours on a furnace than in warmer states, so maintenance matters. The better questions are how often it’s breaking, what the repair costs and how much energy it’s using.

A common rule of thumb: if the repair costs a large share of a new system and the equipment is near or past its expected life, replacement is usually the better money. A cracked heat exchanger or a failed compressor on an older unit often tips it.

We give you both options with prices and tell you honestly which one we’d choose in your shoes. It’s your decision.

By the house, not by the old unit. Many older systems were oversized; a properly sized system runs longer, quieter cycles and controls humidity better.

We look at square footage, insulation, windows, the ductwork and how the home is used, and we offer options that fit your current setup and budget.

If they’re about the same age, replacing both at once often makes sense: the indoor coil and outdoor unit are matched for efficiency, and you pay for one installation.

If one is much newer or still healthy, we’ll quote only what you need.

It depends on the size of the home, the efficiency level, venting and ductwork changes and the equipment you choose, so we quote after seeing the home. Estimates for new systems are free.

Financing through Synchrony is available for HVAC installations and repairs, subject to credit approval.

A single-stage furnace is either fully on or off. A two-stage furnace has a low setting it uses most of the time, and a modulating furnace adjusts in small steps to match the heat the house needs.

More stages mean steadier temperatures, quieter operation and better comfort in big or multi-level homes, at a higher upfront price.

Yes, especially modern cold-climate heat pumps, which can keep heating well below zero, though their output and efficiency drop as it gets colder.

Most Minnesota homes pair a heat pump with backup heat: a gas or propane furnace (called dual fuel) or electric heat. The heat pump handles cooling and most of the mild heating days, and the backup takes over in deep cold.

A heat pump paired with a gas or propane furnace. The heat pump heats on milder days and the furnace takes over when it gets really cold, with the switchover set by temperature or cost.

It’s a popular choice in Minnesota because it trims fuel use without giving up furnace heat on the coldest nights. It also replaces your air conditioner.

A ductless mini-split is a small heat pump with an outdoor unit and one or more wall-mounted indoor heads, connected by a thin line set instead of ducts.

It’s a great fit for additions, finished garages, three-season porches, older homes without ductwork and rooms the main system never reached.

Neither is better for every home. Boilers heat water and deliver quiet, even radiant heat through radiators, baseboard or floor tubing. Furnaces heat air and share ducts with central air.

If your home already has a boiler and radiators, a new high-efficiency boiler is usually the natural replacement. We install and repair both.

Yes. Hydronic tubing can go into a new slab or under certain floors, and electric radiant mats work well under tile in bathrooms.

Radiant floors are especially comfortable on cold basement slabs. Hydronic systems need a heat source (usually a boiler or water heater designed for it) and a manifold; we design and install the whole loop.

Banging (often called kettling) can point to scale build-up, air in the system or a circulator problem; leaks can come from fittings, valves, the relief valve or the boiler itself.

A relief valve that drips can mean pressure is too high, so don’t cap or plug it. Turn the boiler off and call us. Any boiler problem in freezing weather is worth a same-day call.

Check it monthly and change a standard 1-inch filter every one to three months, more often with pets, construction dust or during heavy heating and cooling months. Thicker 4–5 inch media filters often last 6–12 months.

A clogged filter is one of the most common reasons a furnace overheats and shuts down or an AC coil freezes.

Once a year for each: the furnace before the heating season and the AC in spring.

A tune-up catches small problems (weak igniters, dirty flame sensors, clogged drains, low airflow) before they become a no-heat call on the coldest night of the year.

In a Minnesota winter, roughly 30–40% indoors, and lower when it’s well below zero. Too much humidity in cold weather causes frost and condensation on windows and can lead to mold in walls and attics.

In summer, aim for about 40–50%. If your home runs damp, a dehumidifier or a properly sized AC helps.

An air exchanger (HRV or ERV) brings fresh outdoor air in and sends stale indoor air out, while recovering much of the heat from the outgoing air.

Tight, newer Minnesota homes often need one to control moisture, odors and indoor pollutants. We install and repair them.

They can help in the right situation. Whole-house filtration is the foundation; UV germicidal lights can help keep the AC coil clean, and air purifiers can help households with allergies or asthma.

We’ll tell you what will actually make a difference in your home before recommending equipment.

Not on a fixed schedule for most homes. It’s worth it after a remodel or construction, if you see dust or debris blowing from registers, after pest problems, or when you move into a home with an unknown history.

Keeping up with filter changes does more for everyday dust than frequent duct cleaning.

AFUE is a furnace or boiler’s fuel efficiency: a 96% AFUE furnace turns about 96% of its fuel into heat for the home. SEER2 rates cooling efficiency, and HSPF2 rates a heat pump’s heating efficiency; higher is better for both.

SEER2 and HSPF2 replaced the older SEER and HSPF ratings in 2023 with a tougher test, so the numbers look lower even for comparable equipment.

Usually, yes. With our long heating season, a condensing furnace (around 95% AFUE and up) saves noticeably more gas here than in warmer states.

Condensing furnaces vent through PVC pipe and need a condensate drain, so venting and drain routing are part of the install.

Sometimes, but R-22 hasn’t been produced or imported in the U.S. since 2020, so only recovered or reclaimed supply is left and it’s expensive.

For an older R-22 system with a leak or a failed major part, replacement is usually the better investment. Refrigerant work must be done by an EPA-certified technician.

Under federal rules, new air conditioners and heat pumps are moving from R-410A to lower–global-warming refrigerants such as R-454B and R-32, which are classified A2L (mildly flammable).

Existing R-410A systems can still be serviced. A2L equipment uses its own parts and procedures, so the indoor and outdoor units should be matched and installed by trained technicians.

Often, yes, but they change. Minnesota gas and electric utilities, including CenterPoint Energy, Xcel Energy and Connexus Energy, run their own rebate programs for qualifying furnaces, heat pumps, air conditioners and thermostats.

Check your utility’s current offers before you buy, since amounts and qualifying models change from year to year. We can tell you which equipment options are likely to qualify.

Yes, in most cities. Replacing a furnace, boiler, air conditioner or water heater, or adding gas piping or ductwork, generally needs a mechanical permit from the city’s building department, followed by an inspection.

The permit and inspection protect you, and many insurers and buyers expect them. We take care of permits on the jobs we do.

Minnesota doesn’t issue one statewide HVAC contractor license. Instead, mechanical contractors file a mechanical contractor bond with the Minnesota Department of Labor and Industry (DLI), and many cities also require their own mechanical or gas license. You can look up a business on DLI’s license and bond lookup.

Also ask about insurance, look at the company’s Better Business Bureau profile, and make sure whoever handles refrigerant is EPA Section 608 certified. MN’s All Seasons Comforts publishes license number MB668175 and is a BBB-accredited business.

The exact equipment (brand, model and efficiency), what’s included (permits, venting, line set, thermostat, disposal of the old unit), the price, and any warranty from the manufacturer or installer.

Get it in writing, and ask what isn’t included. A good contractor will explain the difference between options without pressure.

Not automatically. Bids can differ in equipment, sizing, ductwork and venting changes, and permits.

Compare what each quote actually includes. The installation matters as much as the brand: a correctly sized, well-installed system outperforms a better unit installed poorly.

Yes. MN’s All Seasons Comforts offers financing through Synchrony for HVAC installations and repairs, subject to credit approval.

Ask when you get your estimate, and we’ll point you to the application.

Yes. Along with homes, we install and repair commercial kitchen exhaust systems (canopy hoods, exhaust fans and makeup air units), replace rooftop units, and handle commercial HVAC repair and maintenance.