What Are Evaporator Coils?

Ever wonder where the heat in your house goes when you turn on your air conditioner? First and foremost, it’s absorbed by evaporator coils.

The evaporator coils hold chilled refrigerant moved into them via the compressor. When the warm air in your house comes in contact with the chilled coils, it cools the air temperature.

That, in turn, warms the refrigerant inside the evaporator coils, which then moves back into the unit’s condenser coil for recooling as the absorbed heat is released into the outdoors.

Heat pumps also have evaporator coils, and the above process is exactly reversed when you wish to heat your home.

Keeping evaporator coils clean is crucial for both safety and energy efficiency reasons. Dirty coils result in:

  • Ice or frost buildup
  • Less efficient heat absorption and cooling ability
  • Higher levels of energy use to provide the same heating or cooling
  • Higher pressures and temperatures, resulting in unnecessary wear

What Are Fan Coils?

At its most basic, a fan coil unit is the simple combination of a fan and heat exchanger (the coil). It is used in commercial, residential, and industrial buildings.

A fan coil unit is a self-contained unit, as opposed to air handling units, which are part of a larger HVAC system. As such, it does not use ducts and recirculates air to affect temperature change. The air is either heated or cooled as it passes over the fan coils, and the fan itself ensures the circulation progress is continuous, resulting in an eventually uniform air temperature.

The two types of fan coil units, blow through and draw through, refer to the manner in which their circulated air is passed over the coils.

Red Mountain Air Conditioning is your preferred Arizona provider for all your heating and cooling needs. Contact us online or call us at
(480) 878-7098 for more immediate assistance.