Replace or clean filters on air handling unit, furnace, air conditioner and heat recovery ventilator as necessary
Blowing air through a dirty filter is a lot more work, and takes a lot more electricity than blowing air through a clean filter. If your filter gets dirty enough, it can bend, allowing the air (and dust) to flow around the filter instead of through it.
Create a monthly reminder to check filters on air handler, furnace, air conditioner and heat recovery ventilator and replace or clean as necessary. You don’t necessarily need to replace your filters each month, but you should check them. Filters will get dirty faster when there is more dirt and debris in the air – either indoors or out. If there is construction going on in your area, or when trees are dropping fluff or seeds, you will need to replace filters more often.