You should be replacing your furnace's air filter on a regular basis to keep your HVAC system working properly and ensure your family has good air quality in your home.

When to replace your furnace filter Filters play a vital role in the overall function of your furnace -- and can have a noticeable impact on the air quality in your home.

Exactly how often you need to swap your filter varies depending on the manufacturer’s instructions, how often you use your AC, and the quality of your home’s air.

Manufacturers might recommend the frequency to replace your air filter (typically between one to three months), but that's also dependent on factors like pets, usage, and air quality.

There are a few things to keep in mind when determining how often you should change your the air filters on your heating and cooling systems.