99 cent filters do not work effectively!

Here are ideal replacements for common furnace and air conditioning filtration. Looking for box style whole house air cleaner filters? Click here to see our selection of high quality products.

Furnace Filter by Size:

Click for Size 4.23 x 10.75 x 1.5 6 x 12 x 1 6.33 x 17.33 x 2 6.65 x 12.33 x 2 7.5 x 15.5 x 1.75 7.5 x 29.5 x 1 7.5 x 29.5 x 1.75 7.94 x 13.92 x 1.65 8 x 14 x 1 8 x 14 x 2 8 x 14 x 4 8 x 16 x 1 8 x 16 x 2 8 x 16 x 4 8 x 20 x 1 8 x 20 x 2 8 x 20 x 4 8 x 24 x 1 8 x 24 x 2 8 x 24 x 4 8 x 30 x 1 8 x 30 x 2 8 x 30 x 4 8.75 x 6 x 1.38 8.92 x 13.94 x 0.97 9 x 9.5 x 1.75 9.5 x 9.5 x 1 9.5 x 9.5 x 1.75 9.5 x 11.5 x 1.5 9.5 x 14.5 x 1.75 9.5 x 15.5 x 1.75 9.5 x 19.5 x 1.75 9.5 x 23.5 x 1 9.5 x 23.5 x 1.75 9.5 x 24.5 x 1.75 9.75 x 9.65 x 1.65 9.75 x 23.75 x 1 9.75 x 23.75 x 2 9.75 x 23.75 x 4 9.75 x 29.75 x 1.75 10 x 8 x 0.375 10 x 10 x 1 10 x 10 x 2 10 x 10 x 4 10 x 13 x 1.65 10 x 14 x 1 10 x 14 x 2 10 x 14 x 4 10 x 15 x 1 10 x 15 x 2 10 x 15 x 4 10 x 16 x 1 10 x 16 x 2 10 x 16 x 4 10 x 18 x 1 10 x 18 x 2 10 x 18 x 4 10 x 20 x 1 10 x 20 x 2 10 x 20 x 4 10 x 24 x 1 10 x 24 x 2 10 x 24 x 4 10 x 25 x 1 10 x 25 x 2 10 x 25 x 4 10 x 30 x 1 10 x 30 x 2 10 x 30 x 4 10.78 x 18.25 x 0.375 11.25 x 11.25 x 1 11.25 x 11.25 x 2 11.25 x 11.25 x 4 11.25 x 14.65 x 1.65 11.25 x 19.25 x 1 11.25 x 19.25 x 2 11.25 x 19.25 x 4 11.25 x 21 x 1 11.25 x 21 x 2 11.25 x 23.25 x 1 11.25 x 23.25 x 1.75 11.25 x 23.25 x 2 11.25 x 23.25 x 4 11.25 x 23.5 x 2 11.3 x 20.5 x 0.75 11.38 x 23.38 x 1.75 11.5 x 11.5 x 1 11.5 x 15.5 x 1.75 11.5 x 17.5 x 1 11.5 x 19.5 x 1 11.5 x 19.5 x 1.75 11.5 x 21 x 1 11.5 x 21 x 2 11.5 x 21 x 4 11.5 x 23.25 x 2 11.5 x 23.5 x 1 11.5 x 24.5 x 1.75 11.5 x 26.5 x 1 11.5 x 26.5 x 1.75 11.5 x 29.5 x 1 11.5 x 29.5 x 1.75 11.5 x 35.5 x 1 11.5 x 35.5 x 1.75 11.75 x 11.75 x 1.75 11.75 x 17.75 x 1.75 11.75 x 19.75 x 1.75 11.75 x 23.75 x 1.75 12 x 12 x 1 12 x 12 x 2 12 x 12 x 4 12 x 16 x 1 12 x 16 x 2 12 x 16 x 4 12 x 18 x 1 12 x 18 x 2 12 x 18 x 4 12 x 20 x 1 12 x 20 x 2 12 x 20 x 4 12 x 20 x 5 12 x 22 x 1 12 x 22 x 2 12 x 22 x 4 12 x 24 x 1 12 x 24 x 2 12 x 24 x 4 12 x 24 x 6 12 x 24 x 10 12 x 24 x 12 12 x 24 x 15 12 x 24 x 20 12 x 24 x 22 12 x 24 x 30 12 x 24 x 36 12 x 25 x 1 12 x 25 x 2 12 x 25 x 4 12 x 26.2 x 1 12 x 26.5 x 1 12 x 26.5 x 2 12 x 26.5 x 4 12 x 27 x 1 12 x 27 x 2 12 x 27 x 4 12 x 30 x 1 12 x 30 x 2 12 x 30 x 4 12 x 36 x 1 12 x 36 x 2 12 x 36 x 4 12 x 42 x 22 12 x 48 x 2 12 x 72 x 2 12 x 120 x 2 12 x 144 x 2 12 x 216.5 x 4 12.3 x 18.25 x 0.375 12.5 x 20 x 4.375 12.5 x 21 x 1 12.5 x 21 x 2 12.5 x 21 x 4 12.75 x 21 x 1 12.75 x 21 x 2 12.75 x 21 x 4 13 x 18 x 1 13 x 18 x 2 13 x 18 x 4 13 x 20 x 1 13 x 20 x 2 13 x 20 x 4 13 x 21 x 1 13 x 21 x 2 13 x 21 x 4 13 x 21.5 x 1 13 x 21.5 x 2 13 x 21.5 x 4 13 x 24 x 1 13 x 24 x 2 13 x 24 x 4 13 x 24.4 x 4 13 x 214 x 4 13.25 x 13.25 x 1 13.25 x 13.25 x 2 13.25 x 13.25 x 4 13.25 x 25 x 2 13.5 x 13.5 x 1.75 13.5 x 17.5 x 1 13.5 x 17.5 x 1.75 13.5 x 19.5 x 1.75 13.5 x 19.5 x 2 13.5 x 23.5 x 1.75 13.5 x 24.5 x 1.75 13.5 x 29.5 x 1.75 13.5 x 35.5 x 1 13.5 x 35.5 x 1.75 13.75 x 17.5 x 1.75 13.97 x 8.97 x 1 14 x 14 x 1 14 x 14 x 2 14 x 14 x 4 14 x 18 x 1 14 x 18 x 2 14 x 18 x 4 14 x 20 x 1 14 x 20 x 2 14 x 20 x 4 14 x 22 x 1 14 x 22 x 2 14 x 22 x 4 14 x 24 x 1 14 x 24 x 2 14 x 24 x 4 14 x 25 x 1 14 x 25 x 2 14 x 25 x 4 14 x 27 x 1 14 x 27 x 2 14 x 27 x 4 14 x 28 x 1 14 x 28 x 2 14 x 28 x 4 14 x 30 x 1 14 x 30 x 2 14 x 30 x 4 14 x 36 x 1 14 x 36 x 2 14 x 36 x 4 14 x 38 x 1 14.17 x 18.25 x 0.375 14.5 x 19 x 1 14.5 x 19 x 2 14.5 x 19 x 4 14.5 x 19.5 x 1 14.5 x 19.5 x 1.75 14.5 x 24.5 x 1.75 14.5 x 27 x 5 14.5 x 29.5 x 1.75 14.56 x 12.98 x 1.19 15 x 15 x 1 15 x 15 x 2 15 x 15 x 4 15 x 19.25 x 4 15 x 20 x 1 15 x 20 x 2 15 x 20 x 4 15 x 22 x 1 15 x 24 x 1 15 x 24 x 2 15 x 25 x 1 15 x 25 x 2 15 x 25 x 4 15 x 29.5 x 1.75 15 x 30 x 1 15 x 30 x 2 15 x 30 x 4 15 x 30.75 x 1 15 x 30.75 x 2 15 x 30.75 x 4 15 x 31 x 1 15.25 x 15.25 x 1 15.25 x 15.25 x 2 15.25 x 15.25 x 4 15.37 x 21.78 x 5.25 15.37 x 21.87 x 5.25 15.37 x 25.5 x 5.25 15.38 x 21.78 x 5.25 15.38 x 26.9 x 6 15.5 x 15.5 x 1.75 15.5 x 19.5 x 1.75 15.5 x 23.5 x 1.75 15.5 x 24.5 x 1.75 15.5 x 29.75 x 1.75 15.5 x 35.5 x 1 15.5 x 35.5 x 1.75 15.75 x 25.75 x 4.37 15.75 x 31.75 x 1.75 15.75 x 48 x 0.2 15.87 x 24.75 x 3.5 16 x 10 x 0.375 16 x 12.5 x 0.375 16 x 16 x 1 16 x 16 x 2 16 x 16 x 4 16 x 18 x 1 16 x 18 x 2 16 x 18 x 4 16 x 20 x 1 16 x 20 x 2 16 x 20 x 4 16 x 20 x 5 16 x 20 x 6 16 x 20 x 10 16 x 20 x 15 16 x 20 x 20 16 x 21 x 1 16 x 21 x 2 16 x 21 x 4 16 x 21 x 5 16 x 21.5 x 1 16 x 21.5 x 2 16 x 21.5 x 4 16 x 22 x 1 16 x 22 x 2 16 x 22 x 4 16 x 22.25 x 1 16 x 22.25 x 2 16 x 22.25 x 4 16 x 22.5 x 1 16 x 22.5 x 2 16 x 24 x 1 16 x 24 x 2 16 x 24 x 4 16 x 25 x 1 16 x 25 x 2 16 x 25 x 3 16 x 25 x 4 16 x 25 x 5 16 x 25 x 6 16 x 25 x 10 16 x 25 x 15 16 x 25 x 20 16 x 26 x 1 16 x 26 x 5 16 x 27.18 x 5.78 16 x 28 x 4 16 x 30 x 1 16 x 30 x 2 16 x 30 x 4 16 x 32 x 1 16 x 32 x 2 16 x 32 x 4 16 x 36 x 1 16 x 36 x 2 16 x 36 x 4 16 x 48 x 2 16 x 50 x 2 16 x 60 x 2 16 x 72 x 2 16 x 75 x 2 16 x 80 x 2 16 x 96 x 2 16 x 100 x 2 16 x 120 x 2 16 x 125 x 2 16 x 1080 x 1 16.205 x 21.25 x 4 16.25 x 21 x 1 16.25 x 21 x 2 16.25 x 21 x 4 16.25 x 21.25 x 1 16.25 x 21.25 x 2 16.25 x 21.25 x 4 16.375 x 21.375 x 2 16.38 x 21 x 4 16.38 x 21.374 x 4 16.38 x 21.375 x 4 16.38 x 21.38 x 1 16.38 x 21.38 x 2 16.38 x 21.5 x 1 16.5 x 16 x 1 16.5 x 19.5 x 1.75 16.5 x 20 x 1.75 16.5 x 21 x 1 16.5 x 21 x 2 16.5 x 21 x 4 16.5 x 21.5 x 1 16.5 x 21.5 x 1.75 16.5 x 22 x 1 16.5 x 22 x 2 16.5 x 22 x 4 16.5 x 24.5 x 1 16.5 x 24.5 x 1.75 16.88 x 21.38 x 2 17 x 17 x 1 17 x 17 x 2 17 x 17 x 4 17 x 19 x 1 17 x 19 x 2 17 x 19 x 4 17 x 20 x 1 17 x 20 x 2 17 x 20 x 4 17 x 21 x 1 17 x 21 x 2 17 x 21 x 4 17 x 22 x 1 17 x 22 x 2 17 x 22 x 4 17 x 25 x 1 17 x 25 x 2 17 x 25 x 4 17 x 26 x 4 17 x 28 x 6 17.1 x 23.1 x 1.75 17.2 x 26.2 x 5 17.25 x 17.25 x 1 17.25 x 17.25 x 2 17.25 x 17.25 x 4 17.25 x 19.25 x 1 17.25 x 19.25 x 2 17.25 x 19.25 x 4 17.25 x 23.25 x 1 17.25 x 23.25 x 2 17.25 x 23.25 x 4 17.25 x 23.5 x 4 17.25 x 26 x 1 17.25 x 26 x 2 17.25 x 26 x 4 17.25 x 29.25 x 1 17.25 x 29.25 x 2 17.25 x 29.25 x 4 17.25 x 29.5 x 1 17.25 x 29.5 x 2 17.25 x 35.25 x 1 17.25 x 35.25 x 2 17.25 x 35.25 x 4 17.5 x 17.5 x 1 17.5 x 17.5 x 1.75 17.5 x 19.5 x 1 17.5 x 19.5 x 1.75 17.5 x 21 x 1 17.5 x 21 x 5 17.5 x 21.5 x 1 17.5 x 21.5 x 1.75 17.5 x 23.5 x 1 17.5 x 23.5 x 1.75 17.5 x 23.5 x 2 17.5 x 23.5 x 4 17.5 x 24.5 x 1 17.5 x 24.5 x 1.75 17.5 x 27 x 1 17.5 x 27 x 2 17.5 x 27 x 4 17.5 x 27 x 5 17.5 x 29.5 x 1 17.5 x 29.5 x 1.75 17.5 x 29.5 x 2 17.5 x 35.5 x 1 17.5 x 35.5 x 1.75 17.75 x 16.87 x 0.87 18 x 18 x 1 18 x 18 x 2 18 x 18 x 4 18 x 19 x 1 18 x 20 x 1 18 x 20 x 2 18 x 20 x 4 18 x 22 x 1 18 x 22 x 2 18 x 22 x 4 18 x 24 x 1 18 x 24 x 2 18 x 24 x 4 18 x 24 x 6 18 x 25 x 1 18 x 25 x 2 18 x 25 x 4 18 x 30 x 1 18 x 30 x 2 18 x 30 x 4 18 x 36 x 1 18 x 36 x 2 18 x 36 x 4 18.25 x 22 x 1 18.25 x 22 x 2 18.25 x 22 x 4 18.3 x 23.75 x 3.5 18.3 x 28.5 x 3.5 18.32 x 21.25 x 3.5 18.5 x 20.5 x 1 18.5 x 20.5 x 1.75 19 x 19 x 1 19 x 19 x 2 19 x 19 x 4 19 x 20 x 4 19 x 20 x 5 19 x 21 x 1 19 x 21 x 2 19 x 21 x 4 19 x 22 x 1 19 x 22 x 2 19 x 22 x 4 19 x 23 x 1 19 x 23 x 2 19 x 23 x 4 19 x 27 x 1 19 x 27 x 2 19 x 27 x 4 19 x 96 x 2 19.25 x 21.25 x 1 19.25 x 21.25 x 2 19.25 x 21.25 x 4 19.25 x 23.25 x 1 19.25 x 23.25 x 2 19.25 x 23.25 x 4 19.5 x 19.5 x 1 19.5 x 19.5 x 1.75 19.5 x 19.5 x 2 19.5 x 21 x 1 19.5 x 21 x 2 19.5 x 21 x 4 19.5 x 21.5 x 1.75 19.5 x 22 x 1 19.5 x 22 x 2 19.5 x 22 x 4 19.5 x 22.5 x 1 19.5 x 22.5 x 1.75 19.5 x 23.5 x 1 19.5 x 23.5 x 1.75 19.5 x 24.5 x 1 19.5 x 24.5 x 1.75 19.5 x 29.5 x 1 19.5 x 29.5 x 1.75 19.5 x 35.5 x 1 19.5 x 35.5 x 1.75 19.75 x 21 x 1 19.75 x 21 x 2 19.75 x 21 x 4 19.75 x 22 x 1 19.75 x 22 x 2 19.75 x 22 x 4 19.75 x 24.37 x 4.37 19.75 x 24.38 x 4.37 19.75 x 25.37 x 4.37 19.8 x 21.5 x 1 19.87 x 21.5 x 1 19.875 x 21.5 x 2 19.88 x 21.5 x 1 19.88 x 21.5 x 2 19.88 x 21.5 x 4 20 x 10 x 0.375 20 x 12.5 x 0.375 20 x 20 x 1 20 x 20 x 2 20 x 20 x 4 20 x 20 x 5 20 x 20 x 6 20 x 20 x 10 20 x 20 x 15 20 x 20 x 20 20 x 21 x 1 20 x 21 x 2 20 x 21 x 4 20 x 21 x 5 20 x 21.5 x 1 20 x 21.5 x 2 20 x 21.5 x 4 20 x 22 x 1 20 x 22 x 2 20 x 22 x 4 20 x 22.25 x 1 20 x 22.25 x 2 20 x 22.25 x 4 20 x 22.5 x 1 20 x 22.5 x 1.75 20 x 23 x 1 20 x 23 x 2 20 x 23 x 4 20 x 23 x 5 20 x 24 x 1 20 x 24 x 2 20 x 24 x 4 20 x 24 x 6 20 x 24 x 12 20 x 24 x 15 20 x 24 x 20 20 x 24 x 22 20 x 24 x 30 20 x 24 x 36 20 x 25 x 1 20 x 25 x 2 20 x 25 x 4 20 x 25 x 5 20 x 25 x 6 20 x 25 x 6.13 20 x 25 x 10 20 x 25 x 15 20 x 25 x 20 20 x 25.25 x 3.5 20 x 26 x 1 20 x 26 x 5 20 x 27 x 1 20 x 27 x 2 20 x 27 x 4 20 x 30 x 1 20 x 30 x 2 20 x 30 x 4 20 x 32 x 1 20 x 32 x 2 20 x 32 x 4 20 x 36 x 1 20 x 36 x 2 20 x 36 x 4 20 x 40 x 2 20 x 48 x 1 20 x 48 x 2 20 x 50 x 1 20 x 50 x 2 20 x 60 x 2 20 x 72 x 2 20 x 75 x 2 20 x 80 x 2 20 x 96 x 2 20 x 100 x 2 20 x 120 x 2 20 x 125 x 2 20 x 1080 x 1 20.1 x 21.1 x 5 20.1 x 23.2 x 5 20.25 x 20.75 x 5.25 20.25 x 24.25 x 5.78 20.25 x 25.3 x 5.25 20.25 x 25.38 x 5.25 20.5 x 21.5 x 1 20.5 x 21.5 x 1.75 20.7 x 26.2 x 5 21 x 21 x 1 21 x 21 x 2 21 x 21 x 4 21 x 21.5 x 5 21 x 22 x 1 21 x 22 x 2 21 x 22 x 4 21 x 23 x 0.2 21 x 23 x 1 21 x 23 x 2 21 x 23 x 4 21 x 23.25 x 1 21 x 23.25 x 2 21 x 23.25 x 4 21 x 23.5 x 1 21 x 26 x 4 21 x 27 x 5 21.25 x 21.25 x 1 21.25 x 21.25 x 2 21.25 x 21.25 x 4 21.5 x 21 x 1 21.5 x 21.5 x 1 21.5 x 23.25 x 1 21.5 x 23.25 x 2 21.5 x 23.25 x 4 21.5 x 23.5 x 1 21.5 x 23.5 x 1.75 21.5 x 24 x 1 21.5 x 24 x 2 21.5 x 24 x 4 21.5 x 26 x 1 21.5 x 26 x 2 21.5 x 26 x 4 21.5 x 27.5 x 5 21.65 x 24.25 x 3.5 21.875 x 21.875 x 1.75 22 x 22 x 1 22 x 22 x 2 22 x 22 x 4 22 x 24 x 1 22 x 24 x 2 22 x 24 x 4 22 x 25 x 2 22 x 26 x 1 22 x 26 x 2 22 x 26 x 4 22 x 28 x 1 22 x 28 x 2 22 x 28 x 4 22.25 x 11 x 0.125 22.25 x 25 x 1 22.25 x 25 x 2 22.25 x 25 x 4 23 x 25 x 1 23 x 25 x 2 23 x 25 x 4 23.1 x 23.1 x 1 23.1 x 23.1 x 1.75 23.25 x 11.5 x 2 23.25 x 29.25 x 1 23.25 x 29.25 x 2 23.25 x 29.25 x 4 23.38 x 21.5 x 1 23.38 x 23.38 x 1 23.38 x 23.38 x 1.75 23.5 x 21 x 1 23.5 x 21 x 5 23.5 x 23.5 x 1 23.5 x 23.5 x 2 23.5 x 23.5 x 4 23.5 x 25 x 1 23.5 x 25 x 2 23.5 x 25 x 4 23.5 x 29.5 x 1 23.5 x 29.5 x 1.75 23.5 x 35.5 x 1 23.5 x 35.5 x 1.75 23.5 x 35.5 x 2 23.75 x 23.75 x 1 23.75 x 23.75 x 1.75 23.75 x 24.37 x 4.37 23.75 x 24.38 x 4.38 23.75 x 24.75 x 3.5 24 x 12 x 6 24 x 12 x 16 24 x 24 x 1 24 x 24 x 2 24 x 24 x 4 24 x 24 x 6 24 x 24 x 10 24 x 24 x 12 24 x 24 x 15 24 x 24 x 20 24 x 24 x 22 24 x 24 x 30 24 x 24 x 36 24 x 25 x 1 24 x 25 x 2 24 x 25 x 4 24 x 26 x 4 24 x 28 x 1 24 x 28 x 2 24 x 28 x 4 24 x 30 x 1 24 x 30 x 2 24 x 30 x 4 24 x 36 x 1 24 x 36 x 2 24 x 36 x 4 24 x 48 x 2 24 x 72 x 2 24 x 96 x 2 24 x 120 x 2 24 x 1080 x 1 24.2 x 26.2 x 5 24.5 x 24.5 x 1 24.5 x 24.5 x 1.75 24.5 x 27 x 5 24.5 x 27.5 x 1 24.5 x 27.5 x 1.75 24.5 x 28.5 x 1 24.5 x 28.5 x 1.75 24.5 x 31.5 x 1 24.5 x 31.5 x 1.75 24.5 x 31.75 x 1.75 24.75 x 24.75 x 1 25 x 25 x 1 25 x 25 x 2 25 x 25 x 4 25 x 28 x 1 25 x 28 x 2 25 x 28 x 4 25 x 29 x 1 25 x 29 x 2 25 x 29 x 4 25 x 30 x 1 25 x 32 x 1 25 x 32 x 2 25 x 32 x 4 25 x 50 x 2 25 x 75 x 2 25 x 100 x 2 25 x 125 x 2 25.7 x 20.1 x 5 26 x 21 x 1 26 x 21 x 5 26.5 x 26.5 x 1 26.5 x 26.5 x 1.75 27 x 27 x 1 27 x 27 x 2 27 x 27 x 4 27.5 x 29.5 x 1 27.5 x 29.5 x 1.75 28 x 24 x 2 28 x 29.5 x 2 28 x 30 x 1 28 x 30 x 2 28 x 30 x 4 28.5 x 28.5 x 1 28.5 x 28.5 x 1.75 29 x 29 x 1 29 x 29 x 2 29 x 29 x 4 29.5 x 29.5 x 1 29.5 x 29.5 x 1.75 30 x 30 x 1 30 x 30 x 2 30 x 30 x 4 30 x 36 x 1 30 x 36 x 2 30 x 36 x 4 32 x 29.5 x 2 36 x 29.5 x 2 40 x 1080 x 1 42 x 72 x 1 42 x 96 x 1 42 x 120 x 1 42 x 144 x 1 42 x 360 x 1 42 x 480 x 1 48 x 1080 x 1 60 x 1080 x 1 72 x 1080 x 1

FiltersUSA.com features these popular brands of furnace air filters:

• Accumulair Electrostatic Filters MERV 6 to MERV 13



• NEW! BestAir odor and allergy filters Compare to Filtrete ®



• AllergyZone Pleated Filters



• GREEN MERV 8 Pleated Filters



• Purolator polyfiber Disposable Furnace Filters by Indigo



• Purolator Fiberglass Disposable Furnace Filters by Indigo



• Purolator Pleated Disposable Furnace Filters by Indigo



• Washable Furnace Filter



• Multi-ply Furnace Filter



• Cut to fit Furnace Filter

Learn how to change your furnace filter.

How ofter should I change my furnace filters? Recommendations vary based on a number of factors: the type of filter that you use, how many pets you have, whether anyone in your home has allergies, etc. If you use disposable fiberglass panel filters, you should change them anywhere from once a month to once every three months. Pleated furnace filters generally last from 3 months with some up to a year.

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