Furnace Filters 
 
How often should I change my furnace filter?
  • You should change a furnace filter at least every three months.
  • A dirty filter will slow down air flow and make the system work harder to keep you warm or cool - and that wastes the energy you are paying for!
  • A clean filter prevents dust and dirt from building up in the system.
  • A dirty filter may lead to expensive maintenance - or even cause your system to fail.
  • For more information on ways to save, visit the ENERGY STAR® website.

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