The evaporator coil is an essential part of your AC system along with the compressor, condenser coil and fan. It cools the air by absorbing heat. It also aids in humidity control, which is particularly valuable in Port St. Lucie, Palm City and neighboring communities along the Treasure Coast. You need to understand the refrigeration cycle to appreciate why this component is so important.

How the Cooling Cycle Works

Air conditioners circulate pressurized refrigerant through a loop of pipes called coils. The compressor and condenser work together to pressurize and liquefy the refrigerant on the hot side of the system.

Just before the refrigerant reaches the evaporator, it travels through an expansion valve. When the liquid refrigerant evaporates, it reverts to its gas form. Consequently, the temperature drops. This thermodynamic principle is called the Joule-Thomson effect.

As the gas moves through the coils on the cold side of the system, it chills the air. The coils and fins create a large surface area that absorbs heat. This is how your air conditioner cools your home.

Evaporator Coils and Humidity Control

The other thing that’s so important about the evaporator is that it removes humidity by cooling the air below the dew point. As your air conditioner runs, condensation forms on the cold coils. The effect is similar to condensation forming on a glass of ice water.

Thanks to the evaporator, your air conditioner removes approximately 20 gallons of humidity every day. All of this moisture drips into a collection pan. The condensation then drains outside your house if you have a split HVAC system or away from the outdoor unit if you have a packaged system.

Air Conditioning Services in Palm City

If you have questions about your AC system or how it works, you can learn more about our air conditioning installation services online or by calling Grimes Heating & Air Conditioning at 772-208-9892. We’ve served local customers since 1962. We’re here for you around the clock.