An AC removes humidity only while it runs, because moisture condenses on the cold coil over time. A house that's cool but clammy almost always has an oversized AC that cools fast and shuts off before it can wring moisture out — short cycles that never dehumidify. Other causes: humid outside air leaking in, ducts pulling moisture from a crawlspace or attic, or the thermostat set so high the unit barely runs. In humid Gordon County this is a sizing or building problem far more often than a broken AC — and Anderson can measure which it is.
The building-science truth: dehumidifying takes run time
Your air conditioner doesn't just cool the air — it dries it. As warm, humid indoor air passes over the cold evaporator coil, water condenses out of it and drains away. But that only happens while the system is running, and it takes time for meaningful moisture to condense. Cooling is fast; dehumidifying is slow. That single fact explains most 'cool but clammy' houses in Calhoun.
Why an oversized AC makes it worse
This is the most common cause, and it's counterintuitive. An oversized air conditioner has so much capacity that it cools the air to the thermostat setpoint in just a few minutes — and then shuts off, before the coil has had time to pull much humidity out. The thermostat is satisfied, so the unit rests, the humidity creeps back up, and you're left cool and damp. A correctly sized unit runs longer, steadier cycles that actually dehumidify. This is exactly why bigger is not better — the right-sized system feels better because it runs longer.
The other humidity culprits
- A leaky building envelope. If humid outside air is pouring in through gaps around the attic, rim joist, and penetrations, your AC is fighting a losing battle against moisture it can't keep up with. A blower door measures exactly how leaky the home is.
- Ducts in humid spaces. Return ducts that pull air from a damp crawlspace or attic drag moisture straight into your living space. A duct blaster measures this.
- Thermostat set too high. If the unit barely runs because the setpoint is high, it barely dehumidifies. Sometimes the fix is as simple as run-time strategy.
- No dedicated dehumidification. In a very humid home, even a right-sized AC may need help from a whole-home dehumidifier — but that's the last step, after the building is addressed, not the first.
What humidity level you're aiming for
Most people are comfortable around 40-50% relative humidity in summer. Above roughly 55-60% the air feels sticky, sleep suffers, and you start risking mold and dust mites. The goal isn't a bone-dry house — it's keeping humidity in that comfortable band while staying cool.
Why Anderson measures before prescribing
Most shops can only sell you a dehumidifier. Anderson is a building-science company with six blower doors and six duct blasters, so we can actually find why your house is humid — oversized equipment, a leaky envelope, or ductwork pulling moisture in — and treat the real cause. The fix might be air sealing, sealing ducts, right-sizing the equipment, adding dehumidification, or a combination. We measure first, then prescribe.
