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Full Time Heating and Cooling · Watertown, MN

Air Exchanger Repair and Installation — Honest Diagnostics

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Air Exchanger Repair and Installation — Honest Diagnostics
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What an Air Exchanger Actually Does

An air exchanger, specifically a heat recovery ventilator (HRV) or energy recovery ventilator (ERV), continuously cycles fresh air into your home while exhausting stale indoor air. The core of the unit transfers heat between the two airstreams so you're not paying to warm up a constant supply of sub-zero outdoor air in January. That heat exchange is the whole point. Without it, you're either sealing your house up and breathing recirculated air all winter, or you're cracking windows and losing heat. Neither option is great. In a well-sealed Minnesota home, a functioning air exchanger is what keeps humidity, CO2, and odors from building up to levels you can actually notice. Our indoor air filtration services work alongside air exchanger ventilation to give you the most complete indoor air quality setup possible.

Signs Your Air Exchanger Needs Service

Details below
These are the most common reasons homeowners call us about their air exchanger. Some are obvious. Some aren't.

Condensation on Windows

Excessive moisture on windows in winter usually means your air exchanger isn't pulling enough humid air out of the house. A clogged core or failed motor is often the culprit.

Stale or Musty Air

If rooms feel stuffy even with the HVAC running, the exchanger may not be moving air at all. Check that it's actually operating before assuming it's a bigger problem.

Unit Running Constantly or Not at All

Both extremes are a problem. A unit that won't shut off may have a control board issue. One that won't start at all could be a motor, a fuse, or a wiring fault.

Ice Forming on the Core

Some frosting in extreme cold is normal, but heavy ice buildup that doesn't clear means the defrost cycle isn't working — and a blocked core drops efficiency to near zero.

Visible Dirt on the Core or Filters

Air exchangers have filters that need cleaning every few months and a heat exchange core that should be inspected annually. Most homeowners have never touched theirs.

Unusual Noise

Rattling, humming that's louder than usual, or grinding sounds point to fan motor wear or debris inside the unit. Catching it early is almost always cheaper than waiting.

How We Service an Air Exchanger

When we arrive for an air exchanger service call, the first thing we do is check whether the unit is actually running and moving air at the rated flow. A lot of 'bad air quality' calls turn out to be a unit that's been sitting idle because of a tripped breaker or a failed control. From there we pull and clean the filters, inspect the heat exchange core for damage or heavy fouling, check the defrost operation, test the fan motors, and look at the ducting connections for leaks. If the core is cracked or the motors are worn out, we'll tell you the repair cost and the replacement cost and let you decide. We're not going to push a new unit on you if cleaning and a motor swap will get the system running well for another several years. For homes where we're also doing an HVAC maintenance program, air exchanger checks fit naturally into the same annual visit.

Air Exchanger Installation — What to Expect

If your home doesn't have an air exchanger and you're dealing with chronic humidity problems, allergy symptoms, or high CO2 levels that make rooms feel stuffy, installation is worth a real conversation. We'll look at your existing ductwork, the size of your home, and your heating and cooling setup to figure out what system makes sense. An HRV is typically the right call for Minnesota's climate — it handles heat recovery well in both directions, which matters for a cooling season too. ERVs transfer moisture as well as heat, which can be the right fit in certain situations but isn't always necessary here. We'll walk you through the difference before any work starts. If you're also thinking about a thermostat upgrade to control your ventilation schedule, that's worth discussing at the same visit.

Energy Recovery Ventilation and Whole-Home Air Quality

An air exchanger handles ventilation. It doesn't filter fine particles, allergens, or viruses the way a dedicated filtration system does. If your concern is air quality broadly, the right answer usually involves both. Our air filtration options pair well with HRV and ERV systems because they handle different parts of the problem: the exchanger brings in fresh air and removes moisture, and the filtration system cleans what's circulating. If you're running a small business and have similar concerns about air quality in a commercial space, our commercial HVAC maintenance team can assess what's needed there too.

Call or Text Anytime for Air Exchanger Help

Air exchangers don't usually fail in a way that feels like an emergency, but they do quietly stop working while your indoor air gets worse. If you haven't had yours serviced in a year or more, or you're not sure it's working at all, give us a call. Fully insured. No commission pressure. Just a straight diagnosis.

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FAQ Common questions

Frequently Asked Questions

Answers below
How often should an air exchanger be serviced? +
Filters should be cleaned every one to three months depending on how dusty your home runs. The heat exchange core and fan motors should be inspected at least once a year. In Minnesota, most technicians recommend a pre-winter check so the defrost cycle and core are in good shape before the coldest months. Skipping annual service is the most common reason HRV cores fail prematurely.
How much does it cost to put in an air exchanger? +
Installation costs vary depending on the unit size and brand. A straightforward replacement of an existing unit with comparable ducting costs less than a first-time installation in a home with no existing ventilation infrastructure. Every job is different — contact Full Time Heating and Cooling for an accurate estimate.
Are home air exchangers worth it? +
In a well-sealed Minnesota home, yes. Modern construction and upgraded insulation reduce natural air infiltration to the point where indoor humidity, CO2, and odors build up without mechanical ventilation. An HRV recovers 70 to 80 percent of the heat from exhausted air, so you're not paying to condition a full supply of outdoor air. For most homes built or tightened after 2000, a functioning air exchanger is one of the better investments in year-round comfort.
How to service an air exchanger? +
Basic homeowner maintenance includes cleaning or replacing the intake and exhaust filters every one to three months and wiping down the exterior. The heat exchange core can often be removed and rinsed, but check your manual first — some cores aren't designed to be wet. Testing airflow with a tissue near the vents gives a rough sense of whether the unit is moving air. Fan motor inspection, defrost cycle testing, and duct leak checks are best handled by a technician with the right tools.
What is the difference between an HRV and an ERV, and which one is right for a Minnesota home? +
An HRV (heat recovery ventilator) transfers heat between incoming and outgoing air. An ERV (energy recovery ventilator) transfers both heat and moisture. In Minnesota's cold, dry winters, an HRV is usually the better fit because it exhausts excess indoor humidity rather than retaining it. An ERV can make more sense in climates where indoor air gets too dry, but most of the homes we service do better with an HRV keeping winter humidity under control.
Can a dirty air exchanger core affect furnace performance? +
Not directly, but the two systems interact. A heavily fouled air exchanger that's no longer pulling moisture out will raise indoor humidity levels. That excess moisture can cause frost on cold surfaces, increase the load on your cooling system in summer, and contribute to the kind of air quality issues that make residents feel like the furnace isn't keeping up. Keeping the exchanger clean is part of keeping the whole HVAC system working the way it should.

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No unnecessary replacements.You get the fix, not the invoice we would rather write.

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