Guides / How Often Should You Change Your HVAC Filter?

How Often Should You Change Your HVAC Filter?

The straight answer: standard 1-inch filters every 90 days at most — monthly with shedding pets or allergies — and thick media filters (4–5 inch) every 6–12 months. The right interval for your home depends on three things: filter depth, occupants, and season.

The schedule by situation

No pets, average dust: 90 days (1-inch) or 12 months (media). One pet: 60 days. Multiple pets or allergies: 30–45 days. Renovation dust or wildfire smoke season: check monthly regardless of type.

What skipping it actually costs

A loaded filter starves airflow: longer run times, higher bills, frozen evaporator coils in summer, cracked heat exchangers in worst-case winters. Techs see the same story weekly — a $10 filter would have prevented a several-hundred-dollar call.

Set it and forget it

Buy filters by the case, write the install date on the frame's edge, and log the change with a next-due date so the reminder finds you — not the breakdown.

Common questions

Are expensive high-MERV filters worth it?MERV 8–11 suits most homes. MERV 13+ filters more but restricts airflow on systems not designed for it — ask your HVAC tech what your blower handles before upgrading.

Which way does the filter arrow point?The arrow points in the direction of airflow — toward the furnace/air handler, away from the return duct.

Part of the complete home maintenance schedule.

Track this in HOGER — your home's verified service ledger