Replace your HVAC filter the right way.

A clean HVAC filter helps air move through the system and keeps dust away from internal equipment. This is a simple homeowner task when the filter is easy to reach. Filters may be beside the indoor unit or behind a large return-air grille, so use your equipment manual if the location is unclear.

What you’ll need

• Replacement filter of the exact same size and approved type
• Phone camera
• Marker and calendar
• Small trash bag

Take it step by step

1. Turn the heating and cooling system off before touching the filter. Use the thermostat or the shutoff method described in the equipment manual. Do not open electrical panels.
2. Find the filter and photograph it before removal. Note the printed dimensions and the direction of the airflow arrow. Carrier says the arrow on the replacement should point toward the blower or indoor unit.
3. Slide the old filter out gently so loose dust stays contained. Place it directly in a trash bag. Do not wash a disposable cardboard-frame filter; only clean a reusable filter when its manufacturer specifically allows it.
4. Compare the old and new filters. Confirm that the size, thickness, and approved filter type match. Slide the new filter into the same slot without forcing it, with its airflow arrow pointing the same direction shown in your photo.
5. Close the grille or filter cover securely, restore normal operation, and write today’s date on the filter frame or set a reminder. Follow the filter and HVAC manufacturer’s replacement schedule because pets, heavy use, and construction dust can shorten filter life.

When to ask for help

Call an HVAC professional if the filter is inside an electrical compartment, the cover will not close, the replacement gets pulled out of place, or airflow remains weak after the change.