The relay actuated by the thermostat which starts and stops the compressor and condenser fan in the outdoor unit.
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The cost of installing a central air conditioner depends on the unit as well as the size of your house. It can cost you anywhere from $1,500 to $1,5000.
Depending on whether the air conditioner is a "central operating unit" or if it is a "stand alone unit". The stand alone is an equipment purchase whereas a "central" is now part of the building.
all it is is a switch that you will usually find 4 wires coming out of. how it works is you get a call for cooling from ur air conditioning unit and that sends a 24v signal to the contactor and it closes the curcuit and gives power to you condencer. control device to relay power to a load
Depending on what situation it is. If it is a small house central heating works better, if it is a big house then air conditioning works better.
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