- Step 1: Turn off the furnace Turn off the power to the furnace.
- Step 2: Locate the filter Locate the filter. It may be behind a door and you may need to unscrew a panel.
- Step 3: Remove the filter Remove the old, dirty filter. Furnace filters simply slide in and out of their housings.
- Step 4: Wash the filter Wash the filter with a hose until the water going through the filter comes out clear. Then let the filter dry completely.
- TIP: If the filter has a cardboard frame it shouldn't be washed and should be replaced.
- Step 5: Reinsert the filter Put the filter back into the furnace, turn on the power to the furnace, and breathe easy.
- FACT: Furnace filters are rated from one to 20 on the industry standard MERV scale. The higher the number, the higher the quality.
You Will Need
- Dirty filter