Best Furnace Filters for Heat Pump Filtration (2026)
We selected filters that match common heat pump nominal sizes, use pleated MERV 8 media, and offer favorable pack quantities and value
The Verdict
- Best Overall: Filterbuy 17.5x23.5x1 Air Filter, MERV 8, 4-Pack — Best for common 17.5x23.5x1 replacements: four-pack MERV 8 pleated filters designed for reliable fit and airflow
- Best Value: Filterbuy 12x18x1 MERV 8 Pleated Air Filter (4-Pack) — Best for compact openings: four-pack 12x18x1 MERV 8 pleated filters that prioritize fit and routine replacement value
This page compares furnace filters suited for heat pump filtration, emphasizing proper fit, MERV rating, and value across common sizes. Picks were chosen by cross-checking nominal dimensions, pleated MERV 8 performance, and pack quantities to favor compatibility and cost-per-filter
Top Picks
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1
Best Overall Filterbuy 17.5x23.5x1 Air Filter, MERV 8, 4-Pack
Best for common 17.5x23.5x1 replacements: four-pack MERV 8 pleated filters designed for reliable fit and airflow
MERV 8 pleated air filters for furnace, AC, or heat pump. Improves HVAC efficiency and air quality. Customers find them well-made, easy to install, and effective at keeping air clean
- mERV 8 filtration
- electrostatic pleated design
- 4-pack for multiple units
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2
Best Value Filterbuy 12x18x1 MERV 8 Pleated Air Filter (4-Pack)
Best for compact openings: four-pack 12x18x1 MERV 8 pleated filters that prioritize fit and routine replacement value
MERV 8 pleated air filters for furnaces, air conditioners, or heat pumps. Improves HVAC efficiency and air quality. customers note easy installation and good value alongside fit concerns
- MERV 8 filtration
- universal 12x18x1 compatibility
- electrostatic pleated design
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3
Filterbuy 16.38x21.5x1 MERV 8 air filter
Best for mid-size returns: single-dimension 16.38x21.5x1 MERV 8 pleated filter focused on balanced capture and airflow
Air filter with MERV 8 for dust and allergy defense. Easy installation and compatible with furnaces, air conditioners, or heat pumps. Customers note good fit and value, but some find size slightly off and components a bit flimsy
- actual size close to 16.50 x 21.50 x 0.75
- electrostatic pleated design
- made in USA
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4
Filterbuy 14x24x1 Air Filter, MERV 8, 4-Pack
Best for standard 14x24x1 slots: four-pack MERV 8 pleated filters offering consistent fit and straightforward maintenance
14x24x1 electrostatic pleated air filters with MERV 8 for dust and allergy defense. Improves HVAC efficiency and air quality. Customers say easy to install and effective at reducing sneezing
- universal compatibility
- electrostatic pleated design
- MERV 8 filtration