What is the evaporator coil and how does it operate?
On a split system central air conditioner the evaporator or “cooling coil” is located in your home above or below the furnace. This coil is also referred to as the “A” Coil because most evaporators are shaped like the letter “A”. The evaporator coil produces cool air for your home by taking hi-pressure liquid refrigerant, produced by your outdoor condensing unit, and converting it to vapor refrigerant. In this process of “boiling off the refrigerant”, air passes over the evaporator coil allowing the coil to absorb heat, resulting in cool air being delivered to your home via the duct work. On a home that has a outdoor combination heating and cooling unit this evaporator coil is located in the outdoor unit directly coupled to the condensing unit section. These units are called package units because all the heating and cooling components are packaged together.
