Your furnace filter cleans the air you breathe. It also keeps dust off the blower motor and out of the heat exchanger, which is why a $15 furnace filter protects a system that costs thousands to replace. Skip a few changes and you don't just get a dustier house. You get a furnace working harder than it should, burning more energy to move less air.
We carry furnace filters in every standard size, plus the odd dimensions older homes tend to have, plus custom sizes built to whatever your return actually measures. The Accumulair line runs from Gold MERV 8 for everyday dust and pollen up through Diamond and Titanium MERV 13 for smoke and fine particulate, with Carbon MERV 10 for odors and Platinum MERV 11 for pet dander and allergies in between. Arm & Hammer Enhanced MERV 8 and Arm & Hammer Maximum MERV 11 are here too, if that's the name you're used to buying.
On picking a MERV: 8 covers the basics, 11 handles pets and allergies, 13 is for asthma or smoke. Denser media restricts airflow, though, and older systems don't always tolerate the jump. If your equipment has a history of airflow issues, check with whoever services it before going to 13.
Find your size below. And if you're between sizes, or your furnace takes something no store carries, custom filters get cut to your exact dimensions.
