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The outlet temperature of an air conditioner is affected by a lot of different variables such as outside temperature; cleanliness of the evaporator coil; speed of blower motor and cleanliness of condenser coil (among numerous other things), but a good rule of thumb is between 15 and 25 degrees colder than the air entering the intake. This temperature difference is referred to as delta-T, so measure the temperature of air at your return grill and subtract it from the temperature coming out of the supply air register and you should find around a 15 to 25 degree difference. Remember, if it is a lot colder than that you probably have a problem with your AC. Colder is not better (usually indicating coolant loss and causing ice-blocking) and if it is less, then your system is not working efficiently or can't cope with the imposed heat load.

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