As the filter collects various bits of airborne debris, it starts to clog up. After a while, that build up makes it very difficult for air to pass through. That means the blower is working harder, increasing your energy bills, taking longer to heat your home, and risking burning out the blower motor.
The best way to know how often you need to change your air filter is by simply checking it on a regular basis. Every furnace heats a different home, with different factors that affect a filter’s life span. After a while, you will develop a good idea of how quickly contaminants build up on your filter and how often you will need to install a replacement.
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