HVAC filter: how often?

Most homes: every 60–90 days.

Pets or allergies: every 30–60 days.

Can't see light through it? Replace it, even if it's early.

Dirty filters = higher bills, weak airflow, and junk in the air. A $15 filter beats a service call.

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Set a reminder once and forget the guesswork: Dwelln tracks filter changes for you.