October 7, 2026
A clean filter is one of the easiest ways to help your heating system do its job. It traps dust and debris and keeps air moving freely through your home. When a filter gets clogged, your system has to work harder to keep you comfortable. Checking your filter every three months is one of the simplest ways to keep your system running efficiently. The steps below show how to find, clean, and replace the filter in a furnace or a heat pump.
How to Clean Your Furnace Filter
A clean furnace filter helps your heating system work efficiently and keeps air flowing through your home. Most furnace filters need to be replaced, but some are reusable and can be cleaned.
Turn off your furnace. Turn off the system before removing the filter.
Find the filter. Look for a removable panel near where air enters the furnace. If you’re unsure where it is, check your owner’s manual.
Remove the filter. Slide it out carefully, noting which direction the airflow arrow points.
Check the filter type. Some furnace filters are reusable, while others are disposable. Do not wash a disposable filter. Replace it with a new one of the same size and appropriate type.
Clean a reusable filter. If the manufacturer says it can be washed, rinse it with water as directed and let it dry completely. Reusable filters can also be brushed or vacuumed, as long as the brush or attachment has soft bristles.
Put the filter back. Reinstall the clean, dry filter, making sure the airflow arrow points in the correct direction. Secure the panel before turning the furnace back on.
Helpful Tip: Check your furnace filter every three months. Replace or clean it as recommended by the manufacturer. A dirty filter can restrict airflow and make your furnace work harder.
How to Clean Your Heat Pump Filter
Keeping your heat pump filter clean helps your system heat and cool your home efficiently. Many ductless heat pumps have reusable filters that can be washed, while some ducted systems use disposable filters that need to be replaced.
Turn off your heat pump. Follow the manufacturer’s instructions for safely turning off the system.
Find the air filter. For a ductless mini-split, the filter is usually behind the front cover of the indoor unit. For a ducted heat pump, it may be near the indoor unit or in a return-air grille.
Remove the filter. Open the cover or grille as directed and gently slide out the filter.
Clean or replace the filter. For a reusable filter, gently rinse it with water or clean it with a soft brush or vacuum attachment, following the manufacturer’s instructions.
Let reusable filters dry. Allow the filter to air-dry fully before reinstalling it.
Reinstall the filter. Slide it back into place, close the cover or grille, and turn the system back on.
Helpful Tip: Check your heat pump filter every three months. Clean or replace it as recommended by the manufacturer to maintain good airflow and system performance.
