How to Change Your HVAC Air Filter

Why It Matters

A dirty air filter restricts airflow, makes your system work harder, and increases energy bills by up to 15%. It also reduces air quality and can shorten the life of your furnace or AC.

When to Change It

Check monthly. Replace every 1-3 months depending on filter type, pets, and allergies. If you can't see light through it, replace it.

Steps

Turn off the HVAC system
Locate the filter slot — usually between the return air duct and the furnace
Slide out the old filter and note the size printed on the frame (e.g., 20x25x1)
Insert the new filter with the arrow pointing toward the furnace
Turn the system back on

Pro Tips

Buy filters in bulk — it's cheaper and you'll always have one ready
Set a phone reminder for monthly checks
Higher MERV ratings (11-13) catch more particles but restrict airflow — check your system's recommendation

Related Guides

Annual Furnace Maintenance Checklist Why Your AC Is Not Cooling and How to Fix It How to Replace Thermostat Batteries How to Clean Your AC Condenser Coils What HVAC Noises Mean and When to Worry

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