4 Comments June 18th, 2011

Why does my air conditioner work fine during the day and blow warm air at night?

Mark asked:


My air conditioner works great during the heat of the day but at night around the time it starts getting darks it starts blowing warm air. Doesn’t that usually work the other way around?
Just turned it off for a half hour and turned it back on and it seems to be blowing colder. I’ll check the coils tomorrow.

This entry was posted on Saturday, June 18th, 2011 at 4:46 am and is filed under Air Condition Units. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

4 Responses to “Why does my air conditioner work fine during the day and blow warm air at night?”

  1. Sunnie Light Says:
    June 18th, 2011 at 10:35 pm

    Maybe your a/c’s tired..

    Our a/c does cold then just air.. when we turn it off for an hour and turn it back on, it’s back too being cold!

  2. LOFT1009 Says:
    June 21st, 2011 at 9:42 pm

    does sound backwards but one thing that comes to mind is that the evap coil may be dirty, do you replace your filters often?

    The dirt will acts as an insulation on the coil and reduces cooling capacity, which may not be noticeable with a high heat load on it, but when nightfall comes and the heat load decreases the evap coil is unable to pull out the heat from the air.

    also could be a condenser fan motor that is freezing up after its been working all day. They’ll often do this when they’re on their last leg…run for some time then quit, and after the unit has been off for a while and restarted will begin to work again.

  3. Phillip Says:
    June 24th, 2011 at 7:08 pm

    Are you sure you got your fan set to auto? cuz thats a weird one

  4. adam/penny Says:
    June 27th, 2011 at 10:02 pm

    it all depends on what YOU have the thermostat’s set at.
    at night the air is not as hot and so the unit doesn’t need to come on as much. raise the setting to make it come on more often.
    good luck to ya