Your furnace probably needs a new filter and almost every Filtrete model is on clearance during Amazon Prime Day

Replacing the filter in your furnace or AC unit will improve your air quality and make your equipment last longer. Stock up during Amazon's annual sale.

By Stan Horaczek

Published Oct 7, 2025 3:03 AM EDT

Filtrete filters on sale for Prime Day — Stock up on filters so you'll always have one when you need it. Filtrete

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Buying filters for your furnace isn’t fun, but it’s necessary. That’s why we recommend stocking up on them during Amazon’s Prime Big Deal Days sale. Right now, just about every size and type is deeply discounted. No matter what kind of furnace you have, the filter for it is probably on sale. Grab a stack of them and keep them on hand so you can change them when you’re supposed to.

Filtrete air filters on sale (organized by MPR/MERV)

MPR 700 (MERV 8) — Tough on pollen, easy airflow

Filtrete 16×25×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 20×30×1 (4-pack) — MPR 700 $33.96 (26.16% off)
Filtrete 20×25×5 (2-pack) — MPR 700 Fits Trion Air Bear & Carrier $35.58 (34.16% off)
Filtrete 16×24×1 (4-pack) — MPR 700 $45.86 (23.25% off)
Filtrete 25×25×1 (6-pack) — MPR 700 $41.17 (31.37% off)
Filtrete 20×24×1 (4-pack) — MPR 700 $40.33 (32.50% off)
Filtrete 24×24×1 (6-pack) — MPR 700 $43.34 (27.75% off)
Filtrete 14×24×1 (6-pack) — MPR 700 $43.34 (27.75% off)
Filtrete 16×25×1 (6-pack) — MPR 700 $41.95 (30.07% off)
Filtrete 16×20×1 (6-pack) — MPR 700 $50.98 (15.02% off)
Filtrete 12×12×1 (6-pack) — MPR 700 $50.93 (15.10% off)
Filtrete 20×20×1 (6-pack) — MPR 700 $48.43 (19.27% off)
Filtrete 16×21×1 (6-pack) — MPR 700 $41.17 (31.37% off)
Filtrete 20×22×1 (6-pack) — MPR 700 $43.34 (27.75% off)
Filtrete 14×20×1 (6-pack) — MPR 700 $50.98 (15.02% off)
Filtrete 16×20×1 (12-pack) — MPR 700 $85.58 (19.26% off)
Filtrete 21×21×1 (6-pack) — MPR 700 $50.98 (15.02% off)
Filtrete 20×24×1 (6-pack) — MPR 700 $43.34 (27.75% off)
Filtrete 20×20×1 (12-pack) — MPR 700 $90.08 (15.01% off)
Filtrete 18×22×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 20×25×1 (12-pack) — MPR 700 $73.63 (30.53% off)
Filtrete 21.5×23×1 (6-pack) — MPR 700 $43.34 (27.75% off)
Filtrete 12×30×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 20×24×1 (12-pack) — MPR 700 $90.08 (15.01% off)
Filtrete 20×23×1 (2-pack) — MPR 700 $90.09 (15.00% off)
Filtrete 16×16×1 (4-pack) — MPR 700 $32.93 (28.40% off)
Filtrete 10×24×1 (4-pack) — MPR 700 $34.37 (25.27% off)
Filtrete 10×20×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 10×20×1 (6-pack) — MPR 700 $44.29 (26.17% off)
Filtrete 15×20×1 (4-pack) — MPR 700 $38.97 (15.26% off)
Filtrete 18×18×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 18×20×1 (4-pack) — MPR 700 $38.49 (16.31% off)
Filtrete 18×20×1 (2-pack) — MPR 700 $19.42 (27.78% off)
Filtrete 14×18×1 (4-pack) — MPR 700 $35.33 (40.87% off)
Filtrete 21.5×23.5×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 20×21.5×1 (4-pack) — MPR 700 $33.90 (26.29% off)
Filtrete 14×18×1 (4-pack) — MPR 700 $33.92 (26.24% off)
Filtrete 21.5×24×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 17.5×19.5×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 17.5×22×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 13.5×13.5×1 (4-pack) — MPR 700 $31.96 (30.51% off)
Filtrete 11.5×11.5×1 (4-pack) — MPR 700 $33.90 (26.29% off)
Filtrete 10×10×1 (4-pack) — MPR 700 $25.48 (15.04% off)
Filtrete 16.5×21.5×1 (4-pack) — MPR 700 $33.90 (26.29% off)
Filtrete 17.5×17.5×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 17×21×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 19.875×21.5×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 23×23×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 24×24×1 (4-pack) — MPR 700 $39.08 (15.03% off)
Filtrete 8×30×1 (4-pack) — MPR 700 $39.08 (15.03% off)

MPR 1000 (MERV 11) — Micro Allergen Defense (1–3 month)

Filtrete 16×25×1 (4-pack) — MPR 1000 $41.47 (30.59% off)
Filtrete 20×20×1 (4-pack) — MPR 1000 $40.31 (32.54% off)
Filtrete 16×20×1 (6-pack) — MPR 1000 $56.06 (29.92% off)
Filtrete 16×25×1 (6-pack) — MPR 1000 $53.26 (33.42% off)
Filtrete 20×20×1 (6-pack) — MPR 1000 $48.72 (39.09% off)
Filtrete 18×20×1 (4-pack) — MPR 1000 $37.38 (37.44% off)
Filtrete 17.5×23.5×1 (4-pack) — MPR 1000 $37.37 (37.46% off)
Filtrete 14×25×1 (4-pack) — MPR 1000 $37.37 (37.46% off)
Filtrete 12×24×1 (4-pack) — MPR 1000 $36.52 (38.88% off)
Filtrete 15×20×1 (4-pack) — MPR 1000 $36.51 (38.90% off)
Filtrete 10×20×1 (4-pack) — MPR 1000 $45.21 (24.33% off)

MPR 1500–1550 (MERV 12) — Asthma & Allergy Friendly

Filtrete 16×25×1 (2-pack) — MPR 1500 $28.01 (36.33% off)
Filtrete 20×30×1 (2-pack) — MPR 1500 $37.03 (15.82% off)
Filtrete 14×30×1 (2-pack) — MPR 1500 $29.85 (32.14% off)
Filtrete 20×24×1 (2-pack) — MPR 1500 $28.34 (15.02% off)
Filtrete 12×24×1 (2-pack) — MPR 1500 $25.07 (43.01% off)
Filtrete 12×20×1 (2-pack) — MPR 1500 $37.38 (15.03% off)

MPR 1900 (MERV 13) — Premium Allergen, Bacteria & Virus

Filtrete 16×25×1 (2-pack) — MPR 1900 $33.99 (26.09% off)
Filtrete 20×25×1 (2-pack) — MPR 1900 $33.23 (27.75% off)
Filtrete 16×25×1 (4-pack) — MPR 1900 $60.54 (24.32% off)
Filtrete 20×20×1 (4-pack) — MPR 1900 $67.98 (15.01% off)
Filtrete 20×20×1 (2-pack) — MPR 1900 $33.89 (26.31% off)
Filtrete 20×30×1 (2-pack) — MPR 1900 $39.08 (15.03% off)

Deep-pleat & 4–5 inch filters (MERV 12–13)

Filtrete 16×25×4 (2-pack) — MPR 1000 (fits Lennox/Honeywell) $42.29 (21.67% off)
Filtrete 16×20×4 (2-pack) — MPR 1550 (fits Lennox/Honeywell) $48.71 (38.53% off)
Filtrete 20×20×4 (2-pack) — MPR 1550 (fits Honeywell) $50.95 (25.06% off)
Filtrete 20×20×4 (4-pack) — MPR 1550 (fits Honeywell) $99.97 (35.50% off)
Filtrete 20×25×4 (4-pack) — MPR 1550 (fits Honeywell/Aprilaire) $99.93 (25.97% off)
Filtrete 20×25×4 Slim Fit (2-pack) — MPR 1550 DP $45.86 (32.55% off)
Filtrete 20×25×5 (2-pack) — MPR 1000 (fits Lennox) $42.48 (15.02% off)
Filtrete 16×25×5 (2-pack) — MPR 1000 (fits Lennox) $42.48 (15.02% off)

2-inch filters (MPR 1000)

Filtrete 20×25×2 (4-pack) — MPR 1000 $50.78 (15.01% off)
Filtrete 16×25×2 (4-pack) — MPR 1000 $59.49 (19.26% off)

Refillable filter systems & refills

Filtrete 16×25×4 Refillable Starter Kit — MPR 1550 (frame + 2 filters) $62.85 (30.16% off)
Filtrete 20×25×4 Refillable Starter Kit — MPR 1550 (frame + 2 filters) $74.68 (17.01% off)
Filtrete 16×25×4 Refillable Replacements (2-pack) — MPR 1550 $40.89 (31.84% off)
Filtrete 16×25×4 Refillable Replacements (2-pack) — MPR 1000 $30.87 (31.38% off)

Water filtration (under-sink & whole-house)

Filtrete Maximum Under-Sink System (3US-MAX-S01) $70.33 (30.47% off)
Filtrete Advanced Under-Sink Quick Change (3US-PS01) $53.75 (14.99% off)
Filtrete Large-Capacity Whole-House System (3WH-HDPL-F01) $10.99 (29.42% off)
Filtrete Water Filter Housings (2-count) $9.81 (19.98% off)
Filtrete Standard-Capacity Whole-House Pleated Refill (2-pack) $12.58 (20.03% off)
Filtrete Standard-Capacity Whole-House Grooved Refill (2-pack) $13.59 (21.22% off)
Filtrete Standard-Capacity Whole-House String-Wound Refill (2-pack) $8.22 (20.04% off)

More MPR 1000 (MERV 11) — Multi-packs & specialty sizes

Filtrete 20×20×1 (2-pack) — MPR 1000 $20.38 (38.89% off)
Filtrete 14×30×1 (2-pack) — MPR 1000 $26.91 (19.31% off)
Filtrete 12×24×1 (2-pack) — MPR 1000 $18.69 (43.96% off)
Filtrete 24×24×1 (2-pack) — MPR 1000 $18.60 (44.23% off)

Even more sizes (selected highlights)

Filtrete 14×20×1 (6-pack) — MPR 1000 $56.09 (29.88% off)
Filtrete 16×24×1 (6-pack) — MPR 1000 $57.32 (28.34% off)
Filtrete 18×24×1 (6-pack) — MPR 1000 $67.98 (15.01% off)
Filtrete 15×20×1 (6-pack) — MPR 1000 $67.98 (15.01% off)

MPR 1500 (MERV 12) — 6-packs (assorted sizes)

Filtrete 24×30×1 (6-pack) — MPR 1500 $90.08 (15.01% off)
Filtrete 12×30×1 (6-pack) — MPR 1500 $90.08 (15.01% off)
Filtrete 12×36×1 (6-pack) — MPR 1500 $90.08 (15.01% off)

MPR 1900 (MERV 13) — 6-packs (assorted sizes)

Filtrete 20×20×1 (6-pack) — MPR 1900 $28.76 (73.61% off)
Filtrete 12×24×1 (6-pack) — MPR 1900 $92.63 (15.01% off)
Filtrete 18×24×1 (6-pack) — MPR 1900 $92.63 (15.01% off)

Other notable sizes & multi-packs

Filtrete 25×25×1 (6-pack) — MPR 1500 $90.08 (15.01% off)
Filtrete 24×24×1 (6-pack) — MPR 1500 $90.08 (15.01% off)

HVAC 4–5″ MERV 13 two-packs (premium)

Filtrete 20×25×4 (2-pack) — MPR 1900 $72.50 (17.59% off)
Filtrete 16×25×4 (2-pack) — MPR 1900 $74.77 (15.01% off)
Filtrete 16×20×4 (2-pack) — MPR 1900 $67.34 (23.46% off)

Specialty & large-format sizes (selected)

Filtrete 12×36×1 (6-pack) — MPR 1000 $62.62 (21.72% off)
Filtrete 14×36×1 (6-pack) — MPR 1000 $67.98 (15.01% off)