7. Shut off fan and furnace. Shut the fan off at the thermostat and the power off to the furnace via the service switch or breaker panel. Do not just shut off the thermostat, because that doesn't turn off the power to the unit.
8. Clean out blower compartment and return air boot. With the power off, you can remove the panels on the front of the furnace and access the blower compartment and the return air boot. Use your vacuum to sweep up the dust built up in the blower compartment and return air boot. This is where the great bulk of your dust will be. Since you’re in here, you should clean the furnace fan as well.
9. Replace furnace filter. Buying a better filter will definitely cut down on the dust in your home. But the better the filter, the more often you should change it; a dirty filter restricts the airflow to the fan, which results in the blower motor running hotter and reducing its lifespan. How often you should change your filter depends on your home, your pets, and your location
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