When it comes to furnace filters, the general recommendation is to replace them every 90 days or three months. However, this can vary depending on the thickness of the filter. Filters that are less than 2 inches thick should be changed every 30 to 90 days, while 3- or 4-inch filters can last 6 to 9 months. Filters up to 6 inches thick can be replaced once a year.
If your filter is made of fiberglass, it should be changed every 30 days. More expensive pleated filters can work well if replaced every three to six months. If you don't change your furnace filter regularly, your furnace won't operate as efficiently and may have a shorter lifespan. It's important to note that not all HVAC systems require a furnace filter. The main purpose of the furnace filter is not to clean the air you breathe, but to clean the air that passes through the furnace and other air conditioning equipment.
Thicker filters tend to last longer and provide more filtration, so they usually cost more than 1 or 2 inch filters. If you have indoor air quality equipment such as air purifiers and air filters, there will be fewer particles for the furnace filter to capture. During the winter when the furnace is used more frequently, you'll need to replace the filter more often. We also offer 5 inch furnace filters (16 x 25 x 5 or 20 x 25 x), whole house air filter brands, and rigid cell furnace filters.
