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Mel = the air conditioner is designed to reduce the temperature of the air from intake to discharge 29 deg F at 50% humidity. if humidity is very high the reduction in temp may be only 16 to 18 degrees. With air cond on Hi-Cool after 15 minutes of running, Place a probe thermometer at the return air = note the temp after the needle stabilizes then place the same thermometer at the cold air discharge - note temp after needle stabilizes. The difference in the temp drop. Most poor performance on a new installation is poor fitting of the AC to the air duct. William |