Sander Scott explains when to swap your furnace filter. Pet owners need to change theirs more often, while people without pets can usually wait six months. The right interval also depends on whether you use a thin fiberglass filter or a high-efficiency one.
Sounds really easy, and people will always want a guideline. What I tell people is this: it depends on a couple things. It's your, it's your lifestyle. If you have dogs and cats, you're gonna have to change them more often. But if you're someone that doesn't have animals, you could probably wait 6 months to change a furnace filter. You have the little skinny fiberglass furnace filters, and then you have the high-efficiency ones.
