When it comes to furnace filters, size is an important factor to consider when determining how often they should be changed. A good rule of thumb is to replace 1- to 2-inch filters every three months, 4-inch filters every six months, and 5-inch filters every 12 months. For 3- and 4-inch filters, plan a replacement approximately every six to nine months. If you have filters larger than 5 or 6 inches, you'll need to change them every nine to 12 months.
The basic consensus among HVAC professionals is that you should replace your furnace filter every 90 days or every three months. However, this depends on the thickness of the filter. Thicker filters have more room to accumulate dirt and dust, so they don't need to be changed as often. Thomas & Galbraith Heating, Cooling and Plumbing, of Ohio, recommends changing filters less than 2 inches thick every 30 to 90 days.
Three- or 4-inch filters can last 6 to 9 months, and filters up to 6 inches thick can be replaced once a year. Generally speaking, you don't need to change HVAC furnace filters as regularly during the winter months compared to the summer months. The oven filter is used to clean the air of contaminants and dust just before air enters the oven system. To get a starting point on how often you want to change oven filters, size matters. In summer and winter, homeowners often change oven filters more often than in autumn and spring. If your household members suffer from allergies or asthma, you should change your oven filter more frequently.
Indoor air quality equipment, such as air purifiers and air filters, reduces the volume of contaminants, so the furnace filter has fewer particles to capture. In homes without this equipment, the oven filter is the only line of defense against airborne contaminants, so the filter fills up faster. For every furry family member that lives in your house, the lifespan of a filter is reduced by approximately 30 days, so you change oven filters more often. Be careful not to confuse Honeywell oven filters with HEPA air filters for purifiers, which last much longer. The oven filters must be changed every month or every year.
Just like there is a wide variety of filters, there are also a wide variety of options in terms of how often to change them. Without a filter, the oven would stop working fairly quickly because the equipment would be too dirty to work properly.
