The answer to 'how long will air filter last' is that the lifespan of an HVAC air filter can vary significantly, typically ranging from 1-6 months. The exact duration depends on factors like filter type, home size, occupancy, and usage patterns.
Fiberglass filters usually last 1-3 months, while pleated filters can last 3-6 months. Homes with more occupants, pets, or high usage will need more frequent filter changes. It's recommended to check your filter monthly and replace it when it appears dirty or clogged to maintain optimal HVAC efficiency and indoor air quality.