How to Replace a Furnace Filter

Breathe a little easier and keep your furnace working efficiently with this simple monthly maintenance.

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If you're a homeowner, you should educate yourself about home heating and air conditioning; this Howcast video series makes it painless.

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Steps

Step 1

Turn off the furnace

Turn off the furnace.
Step 2

Insert the filter

Insert the new filter and begin to feel the difference right away!
Step 3

Locate the arrows

Locate the arrows on the new filter and turn them in the direction of the air flow.
Step 4

Inspect the filter

Hold the filter up to a light to inspect air flow. If it looks dirty or clogged it needs replacing.
Step 5

Remove the filter

Remove the furnace filter from the channel.
Step 6

Locate the filter

Locate the furnace filter. It is usually in the cold air return duct or near the blower.
The filter may be hiding behind a door.
There are 42,000 living dust mites in one ounce of dust.