Your Air Conditioning system is composed of 3 primary parts: 1) Compressor; 2) Condenser; 3) Evaporator. The compressor and condenser are normally on the outside of the building and the evaporator is normally located on the inside the building and can be a part of your furnace.

Air conditioners use a chemical, or refrigerant, that easily converts from a gas to a liquid and back to a gas again. This refrigerant is used to transfer heat from the air inside of a home to the outside air.

The refrigerant is a cool, low-pressure gas when it reaches the compressor. The compressor squeezes the refrigerant causing the fluid to increase its energy and changes from a liquid to a gas and absorbs heat from inside the building in the process. As a high pressure gas, the refrigerant leaves the compressor and flows to the condenser. The condenser serves as a ‘radiator’ and helps the heat to be released from the system into the air.

As the refrigerant leaves the condenser, its temperature cools allowing the refrigerant to convert back from a gas to a liquid. The liquid travels into the evaporator through a very tiny, narrow hole. On the other side of the evaporator, the liquid's pressure drops causing it to evaporate back to a gas state, and as it evaporates, it extracts heat from the air around it. As the refrigerant exits the evaporator, it is now a cool, low pressure gas. It then returns to the compressor to begin its trip all over again.

Connected to the evaporator is a fan that circulates the air inside the house to blow across the evaporator fins. Hot air is lighter than cold air, so the hot air in the room rises to the top of a room. There is a vent there where air is sucked into the air conditioner and goes down ducts. The hot air is used to cool the gas in the evaporator. As the heat is removed from the air, the air is cooled. It is then blown into the house through other ducts usually at the floor level. This cycle continues over and over again until the unit turns off usually by a thermostat when your indoor air reaches a certain present temperature.