Improve Indoor Air Quality by Changing the Furnace Air Filter

changing air filter

This project will show you how to change a furnace filter to improve the indoor air quality in your home.

Poor home air quality has been linked to a variety of health-related issues including allergies, headaches, chronic fatigue and insomnia. By improving the quality of air in your home you can help improve your health and reduce dust and odours.


  •  There are 7 steps to completing this project:
    Step 1  Before you Begin: Eliminate Contamination
    Step 2  Turn off the Power
    Step 3  Remove the Old Filter
    Step 4  Buy a New Filter
    Step 5  Install New Filter
    Step 6  Record Installation Date
    Step 7  Check Filter Regularly

  • Electrostatic Furnace Filter

1  Before you Begin: Eliminate Contamination

Work to eliminate any sources of indoor contamination such as cigarette smoke, mould or mildew.

2  Turn off the Power

Turn off the power to your furnace.

3  Remove the Old Filter

Remove your old filter and measure its size.

4  Buy a New Filter

Find the correct size filter at your local Home Depot. For the very best performance, look for electrostatic filters since these systems can remove even the smallest particles from the air. Simple inexpensive paper filters, by contrast, are designed to protect the mechanics of your furnace, but will do little to improve the quality of air in your home.

5  Install New Filter

Follow the manufacturer's instructions to install your new filter.

6  Record Installation Date

Make a note of the date you installed your filter. Generally, you should replace your furnace filter about every three months.

7  Check Filter Regularly

Check your filter regularly. If you have pets or a dusty environment, your filter may require changing more frequently than every three months. By changing your filter regularly, indoor air quality will be improved, and your furnace won't have to work as hard, which will save you money on energy bills.