When it comes to furnace filters, the rule of thumb is that three- or four-inch filters should be replaced every six to nine months. However, the air quality in your area can affect how often you need to change your filter. If you have a permanent filter, it should be cleaned every 90 days. Pleated filters are more efficient and durable, and they can last up to six months before needing to be replaced.
However, it's best to change them every 90 days for optimal indoor air quality and unit performance.If your home is particularly dusty, you'll need to change one- and two-inch filters every month, four-inch filters every two months, and five-inch filters every three months. This will help preserve your furnace, its efficiency, and your home's indoor air quality. Additionally, changing the filter regularly offers more benefits than just improving indoor air efficiency and quality.If someone in your home has allergies, you may want to change the air filter more often. To do this, loosen the screws that hold the filter cover in place if it is located behind a return air outlet or simply pull the filter out of a slot if it is on the side of the oven.
Whenever the indoor air is exceptionally dusty (for example, if you're doing home renovations), the filter will clog faster.Old and dirty air filters cannot efficiently remove impurities from the air, which significantly reduces your home's indoor air quality. The filters are designed to trap dust and particulates suspended in the air as it passes through the filter and into the furnace system. If windows and doors are usually left open, one- and two-inch filters should be changed monthly, four-inch filters every two months, and five-inch filters every six months.Clogged filters not only have a negative impact on a home's air quality but also force the furnace to work harder to get air into the system, which can shorten its lifespan. If your furnace can handle it, use a filter with a MERV rating of 12 such as the Nordic Pure Filter (available on Amazon).
