How often should you replace your heat pump air filter?

Skipping it eventually leads to water damage or an expensive repair.

Staying on schedule matters beyond the repair bill: a consistent maintenance record is one of the factors in a home's Roots Home Health Score, and well-kept homes typically sell faster and closer to asking price.

How to do it

A heat pump moves air through a filter just like a furnace, and it runs in both heating and cooling seasons, so the filter loads up year-round. A clogged filter cuts efficiency and can freeze the coil.

1. Locate the filter at the return grille or the air handler.
2. Match the size printed on the old frame and buy a pleated filter, MERV 8–11.
3. Insert it airflow-arrow toward the unit and date the frame.
4. Because a heat pump runs most of the year, check it monthly.

Alternatives & optional extras

• Heat pumps are airflow-sensitive; avoid very high-MERV filters that choke an older air handler.
• Keep spare filters on hand since you'll change them more often than a heating-only furnace.

Time: 5 minutes · Typical cost: $5–$25 per filter

What you'll need

• Pleated filter, MERV 8–11

If you skip it

A clogged filter starves the heat pump in both seasons, cutting efficiency and risking a frozen coil.

Other heat pump maintenance

• Schedule heat pump service — once a year, ideally in April

Related systems to keep on schedule

• Boiler / radiators — start with: schedule boiler service, once a year, ideally in September
• Furnace / heating system — start with: replace hvac air filter, every 3 months
• Mini-split / ductless AC — start with: clean mini-split filters, once a month
• Air conditioner — start with: schedule ac tune-up, once a year, ideally in April