HVAC Filters
Furnace and HVAC air filters by size and MERV rating.
Guides and calculators
HVAC FiltersBest HVAC Filter for Allergies
Manufacturers position MERV 11 and 13 pleated filters for allergies. We compared what four 1-inch filters claim to capture and how often each says to change it.
HVAC FiltersBest HVAC Filter for Homes With Pets
Three 1-inch filters state pet guidance on their own pages. We compared what each maker claims to capture and how much sooner it says to change the filter.
HVAC FiltersMERV Ratings Explained, and What Number Actually Makes Sense
MERV measures how small a particle a filter traps, from 1 to 20; a higher number isn't automatically better if your system wasn't built to pull air through it.
HVAC FiltersHow Often to Actually Change Your HVAC Filter
Most HVAC filters need changing every 1 to 3 months rather than on a fixed calendar date; pets, allergies, and filter thickness all shift that interval.
HVAC FiltersHVAC Filter Calculator
Figure out how often your HVAC filter actually needs replacing and how many you'll go through a year, adjusted for pets, allergies, and filter thickness.