A big part of maintaining your furnace is regularly changing out or cleaning the filters. Your filters should at the very least be checked every 30 days if not changed out that frequently, but how do you know what filters to use as replacements? There are a few different kinds of furnace filters available, from cheap disposable fiberglass filters to higher-grade 3M furnace filters. You need to weigh each filter’s advantages and disadvantages whenever you shop for replacements.
Fiberglass filters are the cheapest furnace filters available, and they are popular among renters or those who don’t have a lot of money to spend. Fiberglass filters are disposable, and they can be purchased for between $1 and $2. Unfortunately, they also only have a minimum efficiency reporting value or MERV rating of of two or three. This means that they are fairly inefficient when it comes to cleaning the air in your home.