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How do I know what size air filter to use for my furnace?

How do I know what size air filter to use for my furnace?

How do I know what size air filter to use for my furnace?

Most heating and cooling systems will have air filters in two places; in the furnace mechanical unit, or in the return air vent inside the house. You will need to open those compartments and pull out the existing filter and the size should be stamped on the filter. If you can’t read it, you can simply take a tape measure and measure the 3 dimensions – length, width, and thickness (i.e. 20”x20”x1”).