AC kicking on
 

AC is kicking on when house temp is below thermostat setting- any ideas why?- thank you

It could just be the fan trying to draw down the humidity. The ac will also drive a degree or two below set point so it’s not cycling on and off all the time.

I’m guessing you’re in a new house? lol f so make sure to schedule the walk through with the AC contractor. They’ll run through the system with you and probably tweek a few things.

Humidity perhaps.

thanks- even with no humidistat or dehumidifier installed-?

Most of the HVAC controls have a humidity setting, as I recall ours is around 55%, and then the A/C turns on to control the humidity level. Ours also indicates that it is on for humidity control.

There is a humidity setting that you can turn off. If it is on, the AC will cool down the house to about 3 degrees below the temperature setting to satisfy the humidity setting. Check the thermostat to see if the humidity option is selected. If so, turn it off. I always leave mine off.

thanks to all for the quick responses

You have had a rough day getting stuck at home garbage now A/C.

Of course there's humidity control....
 

perhaps you would be wise to pay more attention to how your heating and cooling system works.

If it's raining outside it's 100 percent humidity. The ac removes humidity out of the air and makes it seem cooler(think of perspiration evaporation as it's how the human body cools itself). So while it seems the ac is running it's likely the fan drawing in humid air and removing some of that dampness.

Note that the optional humidity setting on your HVAC thermostat will attempt to lower the humidity in your house by running the AC longer than it needs to run to satisfy the temperature setting. So, it will remove extra moisture from your house by reducing the temperature to about 3 degrees below what it is set for. You can set the temperature to 72, but, when the humidity is high, you will actually get a temperature of 69. This is a good feature for snowbirds when the house is not occupied because it allows you to set the temperature to a higher setting (about 80 degrees) and save on electricity. When the humidity goes up, the AC will automatically run longer to reduce the moisture in your house. But, when the house is occupied, the optional humidity setting may make the house uncomfortable because it will get too cold when the humidity goes up. So, I recommend turning on the humidity control only when the house is unoccupied. Just my opinion.

Part of, "air-conditioning," is humidity control. You have a drain line outside your home. That drip you see is humidity removed from the air. Unless you have a very old system, there is a humidity setting on the air conditioning control-where you set the temperature. It is raining-hurricane. To control the humidity your AC may well run cooler than the set temperature..

The AC will run cooler only if the optional humidity control is turned on. See Post No. 10.

We keep our humidity set at 55% year round. The last thing we want is a mold problem. When we are there the temp is set to 70 but we are not there much.

It’s bringing the humidity down.

was waiting for someone to say that to op. Always think big picture regarding your home, especially about mold.