I installed the unit a few months ago, but did not turn it on till a few weeks ago and it just blew warm air so I un plugged it and tried a few more time but never was able to get cold air so I called for service. That morning I plugged the unit in and it was blowing warm air, when the service guy got here it some how was blowing cooler air so he said he would document the call. Later that day it was back to blowing warm air. I will have to call in for service again.