So, hopefully you’ve tackled the basic spring-cleaning tasks, and you have clean windows, dust-free corners and a generally tidy house. That’s great! But there’s one more step: your furnace filter. Replacing this guy will keep the air you breath at home fresh (and pollen free) for the spring season ahead! This is quick and easy, but if you’ve never done it before, we’ll walk you through it.
It’s cool if you don’t know! Head to the place in your home where the heating and cooling equipment resides. This could be a closet, your garage, your laundry room, your basement or even your attic. If you have no idea where to look, here's a tip: turn the fan setting on your thermostat to "on." Listen for the system fan and follow the sound.
Most furnace filters can be found on the side of your furnace. If you don’t see it there, check for a removable panel. Some filters have an access panel that needs to be removed. This happens if the filter resides in the fan enclosure. If so, just remove the access panel.
Take a look at the size of the slot on your furnace. It's either going to be a 1-inch slot, or bigger. If it's a 1-inch slot, you have a 1-inch pleated or a 1-inch disposable filter. If it's a 4 or 6-inch slot, you're special – you have a media filter that fits in a thick air cleaner enclosure. In most cases, these filters will have a brand name and will be 4-6-inches in thickness. Some common media filter brands include Aprilaire, Honeywell, Bryant/Carrier, Lennox and Goodman.
Once you've determined the thickness and type of your filter, it's time to figure out overall size. The easiest way is to look for a part number or size somewhere on the filter. Note: The make, model, or serial number of your furnace does NOT provide any useful information about the appropriate filter. If there isn't a size on the filter, get out your tape measure. Find the length and width. Filters are usually rounded up. For example, if your length measures 19 1/2-inches it's going to be sold at 20-inches.