Why Is My House Still Humid With the AC Running?

You set the thermostat low. The AC hums along all afternoon. Yet your skin still feels sticky and your windows fog up. The answer usually has nothing to do with temperature at all.

Humidity and temperature are two separate jobs, and your system has to handle both. Air conditioners cool the air and pull moisture out along the way, but these two tasks do not always happen at the same rate.

Your AC is too large for your home

An oversized air conditioner cools a room fast and then shuts off. Short cycles do not give the system enough time to pull humidity from the air.

Your thermostat fan setting stays on

When the fan is set to on, moisture on the coil gets blown back into your home before it can drain. Switch it to auto.

How we fix high humidity

• Confirm the system is correctly sized.
• Set the fan to auto and clear the drain line.
• Seal and insulate ductwork.
• Add a whole-home dehumidifier when needed.