Air Conditioner - Thermostat Operation

A thermostat is a device that opens or closes a switch in an electrical circuit as a direct result of changes in temperature. Opening and closing this switch turns fan motors, compressors or resistance heaters off and on as required to maintain room temperatures. The thermostat is located so that it senses the temperature of the room air before it is cooled or heated by the evaporator or heater.

 

On air conditioners with an electronic thermostat (higher end models), the maximum temperature fluctuation is approximately 3-4 degrees F., for more stable personal comfort. This kind of thermostat also helps control the humidity in the room better by cycling the compressor on approximately every 8 minutes, even if the room temperature is satisfactory. The compressor will run for about 3 minutes and shut off to help pull excess humidity out of the room.

 

Air conditioners with a mechanical thermostat will maintain a temperature fluctuation of approximately 4-5 degrees F.

 

Note: When the compressor cycles on or off, a metallic click sound from the thermostat may be heard. This is normal. For the best room temperature control, set the energy saver or fan cycle switch to continuous or normal so that the fans runs continuously.