Coil Maintenance

What Are “Coils” and How Do They Work?

Your heating and cooling system contains two different coils. Each coil has a separate and important function. Keeping these coils clean and free of dust/debris helps keep your system running smoothly.

Dirty evaporator coil.

-Evaporator Coil

The evaporator coil in your ac system works to allow refrigerant to evaporate from liquid to gas while absorbing heat in the process. You ac system uses the evaporator coil to absorb heat in the air and sends it back into your home as cold air through your ducting system.

-Condenser Coil

Condenser coil.

The condenser coil is similar in design to your evaporator coil but serves a different purpose. While your evaporator coil removes heat from your indoor air, your condenser coil releases that heat outside. The load of heat energy extracted from your home and compressed in hot refrigerant vapor is quickly released when refrigerant circulates into the coil and condenses to liquid. As the refrigerant releases that heat load, a fan, built into the unit, blows air through the coil and heat is dispersed into outside air. Now turned back into a liquid and under high pressure, the refrigerant makes a “U” Turn and flows back to the evaporator coil through an expansion valve or “txv” that restricts the flow of refrigerant and forces it through a narrow opening and converts it back to a vaporized state ready to absorb more heat from your home.

As we are nearing the end of Monsoon Season here in the valley, it’s time to start thinking about maintaining the system that has worked so hard for you all summer long, especially the cleanliness of your coils. There are steps you can take to ensure that your condenser and evaporator coils are doing their jobs properly.

  • Keep them clean! We recommend getting your indoor and outdoor coils cleaned once a year by your HVAC professional.
  • Keep brush trimmed and away from your condenser unit outside to ensure proper airflow.
  • Make sure you are changing the filter in your home at least once a month and make sure that you are using a flat filter vs a pleated one to ensure maximum air flow.

The Norris Air Services Team