Furnace filter replacement schedule: how often, really.
Somewhere in the house is a filter that decides how hard the furnace works and how long it lives. Most people change it when they remember, and most people remember about once a year. That gap is what this page closes.
How often should a furnace filter be changed?
Once a season, four times a year, covers most houses with a standard 1-inch filter. Thicker media filters last longer between changes. Write the date on the frame with a marker when it goes in, so the next change isn't a guess.
What happens if a furnace filter clogs?
The filter catches dust and pet dander before they reach the furnace. Left in too long, it clogs solid and chokes the airflow: the blower works harder and the heating bill climbs with it. In a hard freeze a starved system can overheat and shut itself down.
How to tell if a furnace filter is dirty.
Pull it from its slot and hold it up to a window. Dark gray and blocking the light means it's done. Dust settling on the furniture hours after cleaning, or the furnace cycling on and off in short bursts, are the other signs.
How to change a furnace filter.
Read the size printed on the old filter's frame, 16x25x1 for example, and buy a match. Note the arrow as the old one slides out: it points toward the furnace, the way the air flows, not toward the room. Slide the new one in facing the same way. Never run the furnace without one, even briefly; dust goes straight into the blower, and a cheap part becomes an expensive repair.
Are expensive furnace filters worth it?
Thicker media filters last longer and protect better. The trap is a high-MERV 1-inch filter on a system that can't pull air through it, so when in doubt, match what's in there now. A whole-house electronic air cleaner, or a filter track that's bent or jammed, is the place to stop and call for service.
Or never think about the furnace filter again. Either plan changes it on every visit, four times a year, as part of the included seasonal list. Plans
Related
One email a month, one job.
The one thing the house needs this month, and how to do it. No sales emails, ever.