When the warmer moths come it will be important to perform maintenance you’re A/C system. One section that will need to checked is the evaporator coil. A dirty evaporator coil will cause you to lose efficiency. We will look at the basic performance of an A/C evaporator coil and explain the best way to clean the coil.


Evaporator coils capture heat from the air inside your home. The evaporator coil is usually made from copper and is surrounded by aluminum fins. The fins help to improve the transfer of heat. Evaporator coils provide the cooling needed to produce the cool air that is introduced into your home. Evaporator coils also play a big part of dehumidifying your home as well.



When evaporator coils get dirty than can cause the following problems:

  • Reduced heat transfer
  • Decreased cooling capacity
  • Increased energy consumption
  • Increased operating pressures and temperatures
  • Increased wear on your system that can lead to
  • Buildup of ice on the coil

Evaporator coils should be cleaned yearly. If the coils are prone to dusty areas, it may be a good idea to check them monthly. You will need to check your evaporator coils at least every three months for any dirt buildup. Evaporator coils will need to be cleaned once a year. The spring time is a good time to accomplish this as part of getting your system ready for the summer.


To clean the A/C evaporator unit:


  • Turn the power of to your A/C unit
  • Remove the screws to loosen the access panel and place the panel to the side.                             
  • Use an air compressor or air tank and blow air across the fins of the coil.                                       
  • If you use a higher pressure, be sure to direct the flow at a 90-degree angle so the high pressure will not damage the fins.
  • You can also use a brush to brush away some of the harder to remove debris.
  • After you have cleaned the coils with air be sure to inspect the coils and comb any bent fins.
  • If there is a build-up that air and brushing will not remove. You could purchase a liquid cleaner made for evaporator coils that do not require the use of water. Follows the manufactures instructions.
  • Replace the access panel and turn the power back on to the unit.


This is a project that is suited for the more experienced DIY person. If you feel this is a project that you cannot do contact your local HVAC contractor to see if they offer this type of service.