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Using two electrostatic furnace filters

Using two electrostatic furnace filters
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I have recently moved into a house and the furnace uses an electrostatic air filter filter and I am unfamiliar with it.  We have 2 filters one is in the furnace and 1 is leaning up against the wall…the slot is big enough for both filters, do I put them both in or would that restrict the airflow…is the sole purpose of having 2 to alternate when cleaning the other.  Thank you in advance for helping me with this question….thank you also for the info on cleaning it this website is very helpful.

It is fairly common for people to have two electrostatic filters. While one is drying after being cleaned the other is used and they are alternated this way. You are also correct about using both of these filters in a heating or air conditioning system. Installing both filters at the same time would definitely cause problems with air flow.

Restricting air flow can cause many different problems:

Restricting air flow in an air conditioner

  • Evaporator coils icing up
  • Poor air circulation in the conditioned space
  • Increased operating costs due to longer run times
  • A decrease in equipment efficiency

Restricting air flow in a furnace

  • Furnaces cycling on high limit switches
  • Cracked heat exchangers
  • Increased fuel consumption due to longer run times
  • A decrease in efficiency

The above are only some of the potential problems that can result from restricting air flow.

About the author: Don has been working in the HVAC industry for more than 25 years and shares his experience and knowledge on this site. If you find the information presented here helpful please share with your friends.

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