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How often should I change my filter?

There are many types of filter and variables.  But here is the basic rule to start with.


  1. Flat panel 1″ thick.   Change every 30 days. So 12 times a year.
  2. Pleated 1″ thick.  Change every 90 days. So 4 times a year.
  3. Specialty air filters such as SpaceGard, AprilAire, Air Bear or Cub, Honeywell, General.  These filters are 3″ to 5″ thick and should be changed once a year.
Variables that shorten a filters life
  1. Pets
  2. Smokers
  3. Above normal household traffic
  • If you have 1 of these variables check you filter at 1/2 it normal life and see how it looks.  If you see build up and or darkened media, replace it.  If not not check it again at 2/3 life.
  • If you have 2 of these change it at half its normal life.
  • If you have 3 of these, check it after 1/3 its life.  If you see build up and or darkened media, replace it.
  • Make notes (and leave them with your furnace papers) on filter conditions and filter change frequencies to help you next time. 
Reasons to stay on top of this
  • Dirty filters waste energy heating or cooling you home
  • Dirty filters put a strain on your furnace or air conditioner, increasing furnace repair bills 
  • Dirty filters shorten the life of your furnace or air conditioner
Free Advice
  • Always use a good filter
  • Always remember to change your filter
  • Remember changing a filter is a lot cheaper than not changing a filter, think furnace repair bills