We find it hard to believe how many people dont use their air conditioning efficiently. On a hot day when all your windows have been rolled up, you should start your A/C on Norm A/C, with the temperature maxed and the fan on high. Then crack the windows a few inches, and let the cold air push out the hot air. Using Norm A/C puts less burden on the system by cooling outside air instead of cooling the extra hot inside air. After a few minutes, simply turn the control knob to Max A/C, adjust the fan to your comfort level, and roll up the windows.