A dirty filter prevents air flow to your furnace and blower, making it run harder and take longer to heat up or cool down your home. Most importantly, a dirty filter can cause damage to your furnace. If you’re not sure the last time your filter was changed, take a look.


Many  furnaces use the standard 1” thick pleated filters. These filters primarily prevent debris from entering the furnace unit and causing damage to the furnace. It is recommended that the filters are changed every 1 to 3 months, depending on use.

If you have a high efficiency filter with a material that more closely resembles felt, you will want to stick to the recommended scheduled of changing every three months. The thicker weave is effective in removing smaller particles from the air and once those particles build up, they can prevent air flow to your furnace. Regular replacement will keep your air quality optimal.

Permanent filters save you the trouble of purchasing a replacement filter, but you will still need to remove, wash, and reinsert the filter every three months to ensure it’s working properly.

Tip: Use a marker to write the date on the side of the filter whenever you change it.


Change more frequently if:

  • You’ve just finished a remodel project in your house.
  • You have pets.
  • You’re a smoker.
  • You have allergies or asthma.
  • Young children or older adults live in the house.


Looking to upgrade to a high efficiency filter? Contact the professionals at Dave Jones, Inc. for information.