Living on the Lakes? Here’s What Humidity is Doing to Your Home’s Comfort
Living near water in Minnesota is one of the best things there is. But lake properties carry a humidity load that inland homes don’t - and most HVAC systems aren’t sized or equipped to deal with it properly.
If your home feels sticky or clammy even when the AC is running, if condensation is appearing on windows or around vents, or if the thermostat says 72° but it feels nothing like 72° - humidity is almost certainly the problem. Our post on indoor humidity in winter covers the related dry-air problem that hits the same properties in the cold months.
Here’s what’s actually happening and what can be done about it.
Why Lake Properties Are Different
Water evaporates constantly from lake surfaces, especially on warm days and overnight when temperatures drop and dew point rises. If your home is within a few hundred feet of the water, you’re living in a microclimate with meaningfully higher relative humidity than properties a mile inland.
During summer in the Brainerd Lakes Area, outdoor humidity regularly hits 70 to 85 percent. On a lake, it’s often higher. That air comes inside every time a door opens, through gaps in the building envelope, and through any ventilation system pulling in outdoor air.
Your AC does remove some humidity as a side effect of cooling - when warm air passes over a cold coil, moisture condenses out of it. But here’s the problem: air conditioners are sized to control temperature, not humidity. When the humidity load is higher than the system was designed for, it runs out of dehumidification capacity before the air feels comfortable - even if it’s hitting the temperature setpoint just fine.
The “Cold But Clammy” Problem
This is the complaint we hear constantly from lake property owners: “The AC is running, the thermostat says it’s the right temperature, but it still feels uncomfortable.”
That feeling is almost always excess humidity. At 72°F and 30% relative humidity, a home feels crisp and comfortable. At 72°F and 65% relative humidity, it feels muggy, heavy, and like the AC isn’t working properly - even though it is, technically.
The human body cools itself through evaporation. High humidity slows that process down. Temperature alone doesn’t determine comfort. Humidity does, and lake homes have more of it to manage.
What This Does to Your Home Beyond Comfort
High indoor humidity isn’t just uncomfortable. Left unmanaged over a summer, it causes real damage:
Mould and mildew. Anything above 60% relative humidity indoors creates conditions where mould can grow - on walls, behind trim, under flooring, in crawl spaces. Lake homes are particularly vulnerable in basements and lower levels where cool surfaces and high humidity combine.
Wood movement. Hardwood floors, cabinetry, and structural timber absorb moisture and expand. Floors cup and gap. Doors and windows stick. Over years, this causes real damage that isn’t cheap to fix.
Air quality. Dust mites thrive in humid environments. For anyone with allergies or asthma, this matters significantly. The Brainerd Lakes Area allergy season is already challenging enough without adding a moisture problem inside the home.
Electronics and appliances. Excess moisture shortens the life of anything with a circuit board. This includes your HVAC system itself - corrosion on electrical components is accelerated in persistently humid environments.
What Actually Solves It
Whole-Home Dehumidifier
The most effective solution for lake properties is a whole-home dehumidifier installed inline with the HVAC system. Unlike portable units that only treat one room and require constant emptying, a whole-home unit pulls all the air in the house through a dehumidification stage before it’s distributed, drains automatically, and is controlled by a humidistat.
A properly sized whole-home dehumidifier can maintain indoor relative humidity at 45 to 50% regardless of what the lake air outside is doing. The difference in comfort is immediate and significant. Most homeowners who install one say they can’t believe they lived without it.
Proper AC Sizing
Oversized air conditioners are a chronic problem, and they make humidity worse. A system that’s too large cools the air quickly and shuts off before it’s run long enough to dehumidify properly. The result is short-cycling: the house hits temperature, the AC turns off, humidity stays high, the house feels clammy almost immediately.
If your AC system was oversized when it was installed - or if you’ve made additions to the home that changed the load calculations - that’s worth looking at, especially on a lake property.
Ventilation Control
Many homes have exhaust fans, HRVs, or ERVs that introduce outdoor air. On a lake, that outdoor air can be extremely humid. Making sure ventilation is controlled and not over-ventilating during high-humidity periods can make a meaningful difference.
When to Call
If you’re heading into summer on a lake property and your home has any of the symptoms above - sticky air, condensation, mould smell, comfort issues despite the AC running - the time to address it is before June. Once the heat and humidity arrive, schedule waits get long and it’s too late to enjoy the difference through the best months.
A quick assessment can tell you whether your existing system has the capacity to handle the load, or whether a dehumidifier makes sense. It’s not always a major investment - and compared to a summer of uncomfortable living or the cost of mould remediation, it’s an easy decision. If your AC is undersized or poorly maintained and struggling to keep up, AC maintenance or a properly sized AC replacement may be part of the solution too.
For cabin owners dealing with extra humidity while using window units, see why lake cabin owners are making the switch to mini-splits — better dehumidification is one of the key reasons.
Mavericks Heating and Air serves the Brainerd Lakes Area including Cross Lake, Brainerd, Baxter, Nisswa, Pequot Lakes, and the surrounding area. Call us at (218) 316-0550 or reach out online to get set up before summer arrives.