That’s right, while you should do it every 6 weeks or so all year-round, a lot of us don’t. So make sure you take the time this spring, before the A/C gets cranked, to clean your furnace filter. Ducts too, if they need it.

And think about a 3M electrostatic Ultimate Allergen Reduction Filter that can catch particles as little as 0.3 microns (for example, a human hair is 150 microns).