It is generally recommended to replace a 16 x 25 x 1 furnace filter at least every 45 to 60 days. However, in some cases, it may need to be changed sooner. Experts suggest changing it every 30 days if the filter is made of fiberglass, which is of relatively low quality. On the other hand, more expensive pleated filters can last up to three to six months if replaced regularly.
In addition to keeping the air conditioning system free of contaminants, furnace filters also help clean the air you breathe indoors. You may not have realized that the furnace filter needs to be changed because not all air conditioning systems require heating, ventilation and air conditioning filters. There are some factors that can shorten or extend the time between furnace filter replacement intervals. We also offer filters for 5-inch furnaces (16x25x5 or 20x25x), whole-home air filter brands, and filters for rigid cell furnaces. During the winter, when the furnace is used more often, you will have to replace the furnace filter more often.
No two homes are the same, so despite the guidelines, you may need to change your furnace filter more often than your neighbor. During a remodeling project, change the furnace filter every 30 days, or even more frequently, to prevent construction-related dust from circulating around the house. Even if no one in the house is allergic, it is advisable to change the furnace filter frequently, up to every 30 days if you have several pets, so that the furnace works efficiently. Filters are assigned a minimum efficiency value (MERV), which ranges from 1 to 16, although scores of 6 to 12 are best for residential furnaces. Be careful not to confuse Honeywell furnace filters with HEPA air filters for purifiers, which last much longer.
Even if you live in a temperate climate with excellent air quality, there's another important reason to change your furnace filter as recommended. Depending on your lifestyle and the type of furnace filter you choose, you may want to change it more often. As a general rule, to make allergy sufferers as comfortable as possible, change the furnace filter every 30 to 60 days. Air conditioning systems may not have any heating components and therefore do not need a furnace filter. If you don't change your furnace filter regularly, you may end up with a furnace that doesn't work as efficiently and is likely to have a shorter lifespan.
However, if your air conditioning system has a single filtration system that uses an air filter for both the air conditioning unit and furnace, replacements will be less common in winter than in summer.
