Replace HVAC air filter
A clogged filter reduces efficiency by up to 15% and strains the motor. Standard 1" filters need changing every 1–3 months; thicker 4" media filters last 6–12 months.
Air filter: Sits in a slot where the return duct meets the furnace, usually behind a removable door near the bottom. An arrow on the filter frame shows which way it goes in.
How to do it
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Watch how-to videosCommon questions
How often should you replace hvac air filter?
Every 3 months. Any time of year.
How much does it cost to replace hvac air filter?
Typically $10 to $30 in parts and supplies. Skipping it risks roughly $150 in repair or replacement costs.
How long does it take?
About 10 min.
Can I replace hvac air filter myself?
Yes — this is a straightforward job for most homeowners with basic tools.
Which of these does your home actually need?
Answer a few questions about your home and HomeGuard builds your personalized maintenance schedule — the right tasks, at the right time of year, for your appliances and climate.
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Vacuum vents and return grilles
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Check thermostat batteries & schedule
Twice a year · 15 min