Never leave the house and turn OFF the A/C then come back home and turn it on and expect it to cool the house anytime soon. Doing this will not allow the unit to cool down the house for MANY hours. You can set the temperature up five to ten degrees but NOT OFF....

"Doors" if you close the door to a room make sure that there is about a 3/4" gap between the bottom of the door and the floor. You may have had carpet put down on the floor and now there is no gap. This is necessary if you have a central return air duct in the...

Never turn the A/C off then back on in less then five minutes, this will short-cycle the compressor and can trip breakers, blow fuses, or cause permanent damage the compressor. You should have a time-delay install on the A/C to prevent this during power outages!...