When it’s time to learn how to install a furnace air filter, there’s a wrong way and a right way. The wrong way is to neglect your air filter until there’s a problem with your system, or to be slipshod in replacement. It’s also a bad idea to try to save money by making air filters last longer than they should. In almost all cases, the pennies you save on air filters turn into stacks of dollar bills spent on higher energy bills and repair costs. 
Instead of wasting your resources on repairs and expenses that are easily controlled, why not use your efforts wisely? Learning to install a furnace air filter correctly is easier than you might think. If you have 10 minutes to spare, you can complete this routine task without even changing into work clothes.
- First, locate the location of the filter air box in your furnace. This is usually located at the bottom of the furnace, near the cold air return duct. Make sure to turn the furnace off.
- Once you find the filter air box, you should be able to easily locate the air filter. It may be held in place by a notch or behind a hinged door.
- After you locate the old air filter, pull it out gently and dispose of it properly. You may want to take along a trash bag to avoid dirtying your floor.
- Look for arrows on the new air filter. These airflow arrows will show you which direction your new air filter should be installed.
- Gently slide your new filter into place, taking care to ensure that the airflow arrows are pointing toward the furnace.
- Clean up any dust or debris left behind and turn the unit back on. Listen for a few minutes to make sure the system is working properly.
- Write down the date you changed the air filter in a safe location for future use. You should change your air filter again in 30 to 90 days.
For fast and efficient service in the Twin Cities, contact Marsh Heating & Air Conditioning Co., Inc.
Our goal is to help educate our customers in Minneapolis-St. Paul, Minnesota about energy and home comfort issues (specific to HVAC systems). For more information about furnace air filters and other HVAC topics, download our free Home Comfort Resource guide.
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