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How Do I Change My Air Filter?

At Sheridan Supply, we feel that regular maintenance of your home’s expensive cooling and heating system is essential to ensure it operates efficiently. Proper maintenance will keep good air quality in your home, increase the life span of your expensive system, and consume less energy which will lower your utility bills..

Where do you live ?  Are you in the Northeast or the Southwest ?   Is your unit running all year or only every 6 months ?  We suggest that your filters should be changed every 30 to 90 days depending on the type and efficiency of your filter. Energy Star (, filters should be changed every month during peak summer and winter months when your HVAC system is operating at highest capacity.

To change your air filter, we suggest these easy steps:

• Step 1: Buy a New Air Filter – Before buying a replacement filter, check your owner’s manual to identify the right number or size of your filter – it could also be printed on the side of your existing air filter.(see our article on How do I Measure My Air Filter)

• Step 2: Turn Off Your HVAC Unit – For safety, always turn off your HVAC unit before attempting to change the filter. If you can’t figure out how to turn off the unit, turn off the circut breaker.

• Step 3: Remove the Dirty Air Filter – Most air filters are located to the right or bottom of the unit and should easily pull out of the slot. Although not common, some filters are found in air vents instead. If that is the case, you might need to contact a HVAC professional for assistance.

• Step 4: Insert Your New Air Filter – There are arrows on the new filter to indicate which side should be facing the outside air. The filter should slide into place easily. You want the arrow to follow the direction of the air flow.  We suggest that you take a black marker and mark On the unit which way your air flow goes.  If you are confused, turn on the unit to determine this.   You might even want to mark your filter size ON the unit.