Here is a guide to changing your air filter!

In most home HVAC systems, you’ll find the air filter in one of three common locations. Here’s how to figure out where yours is:

1. At the Return Air Vent (Most Common in Homes)

Look for the large grille inside your home—usually in a hallway, ceiling, or wall.

If the grille is bigger than a normal supply vent (often 16x20, 20x20, 20x25, etc.), it likely hides the filter.

• Open the grille with the thumbscrews or latches

• The filter will be sitting right behind it

2. At the Furnace or Air Handler (Inside Closet, Attic, Basement, or Garage)

If your system uses a furnace or a central air handler, the filter may be near the blower:

• Look on the side, bottom, or top of the unit where the return duct connects

• There’s often a small slot or door labeled “Filter,” where the filter slides in and out

• This is common for vertical units in closets or horizontal units in attics

3. Inside the Return Plenum (Less Common)

Some older or custom systems place the filter inside the large metal box attached to the furnace:

• You may see a small metal door or panel with screws

• Behind it will be the filter, directly before the blower motor