How often does the evaporator coil need chemically cleaned?Post created: 2013-05-13 Type of Equipment: Heat Pump Views: 444
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On 2013-05-13 JB wrote:
Since the evaporator coil is inside the home and generally self contained it doesn't have to be cleaned as often as the condenser coil, which is outside the house and exposed to the elements and debris from trees and when people mow and all that stuff. The regularity for the evaporator may depend more on variables associated with your home, such as rate of mildew build up, weather dirt and dust can easily enter the ducts, and so on, than anything else.
Probably the best step is to get an experienced HVAC tech to take a look and offer his opinion. Cleaning the evaporator is also a more difficult task than the condenser coil too so you want to keep that in mind. And as always, if you decide to do it yourself make sure you shut the power off to the AC unit. Also, an HVAC tech can do other routine maintenance that is necessary for the efficient operation of the unit.
I also found the following here: http://www.washingtonpost.com/wp-dyn/content/article/2006/08/23/AR2006082300464.html.
Cleaning the evaporator coil is trickier but doesn't need to be done as often. If the ducts in your house are sealed and the housing around the heating and air-conditioning components are well-built, virtually all of the air that passes over the evaporator coil should be passing through the filter of your air-conditioning system. In this case, simply changing the filter frequently -- each month, when you are running the air conditioner often -- may be all you need to do to keep the evaporator coil clean for years. If ducts aren't sealed or if the housing around the evaporator coil leaks air, you may need to clean the coil every year or two.
To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present. To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.