What Type of Filter Should I Use for My Furnace, and How Often Should It Be Replaced?
The size and model of filter you need depends on what system you have—as long as the filter is not too restrictive, it should work. Replacement time varies, depending on the quality of the filter and if you own pets, have allergies, or allow smoking in your Woodbury home. In general, replace standard one-inch filters once every one to three months.