Lennox Air Filters

Usually, Lennox air filter replacement is needed at around 3 months. The more often you use your HVAC system to heat or cool your home, the more air is being filtered and the filter will get dirtier faster. Basic filters may need replacing more often than high-efficiency filters. The level of cleanliness in your home might affect how quickly your air filter gets dirty, as well as the amount of people who live in your home, or if you have pets. 

Check your filter each month to see if it looks dirty, discolored, or clogged.  If less air is coming out of your vents, you might have a clogged filter, so replace it. If you’re having an increase in allergy symptoms, your dirty air filter might be part of the cause. If you notice that some rooms aren’t cooling or heating evenly, you may have restricted airflow due to a dirty filter and need to change it.

Lennox air filters are easy to replace. Locate the filter access panel on your furnace. Open it and 

view the airflow arrow direction on the old filter before you take it out. Slide it out and insert the new filter in, matching the arrow direction of the old one. Then close the access panel and the job is complete.

The lifespan of Lennox air filters varies, but Lennox recommends replacing them every 3 months. Consistently changing your air filter helps maintain the efficiency of your furnace, conserves energy, and ensures that your indoor air quality is better.  While Lennox makes various types of air filters, some need to be replaced more often. If you have pets, you might need to replace your filter more often. 

While you’re not limited to using a specific filter in your Lennox furnace, they do recommend a minimum MERV rating for their furnaces. The most important feature is that it fits your HVAC system properly. Match the length, width, and thickness, and the MERV rating your system currently uses or the specifications in your furnace manual. If not, your filter may not be effective in maintaining the maximum level of indoor air quality in your home. 

Lennox filters come in different sizes and the correct size depends on your furnace model. 

Air Filters Delivered sells Lennox filters in sizes 16x25x4​ and 20x20x5 as well as several other sizes. You can check the size of your current filter on the frame or your Lennox furnace manual. An HVAC technician can help you if you can’t find it.

Using the correct Lennox filter size will guarantee your HVAC system has optimal performance. 

Check your existing filter for its dimensions, which are printed on the frame. Your furnace manual also lists the proper filter size for your unit. When buying a Lennox air conditioner filter replacement, double-check the dimensions so it fits snuggly, and check the MERV rating to make sure it's adequate for your home. A qualified HVAC technician can help you if you can’t determine the size or type you need.

Lennox furnace filters come in various sizes and types with various lifespans. High-performance filters are created for extended use, other fiberglass filters may need more frequent changes. The quality of the air inside your home can impact your filter’s longevity. If you have pets or suffer from allergies, you might need to replace your furnace filter more often, especially during seasons that require peak heating and cooling. 

You shouldn’t run your furnace without using an air filter. It could damage your HVAC system and cause the need for expensive repairs. The main reason to use an air filter is to trap dust, pollen, pet dander, and other particles. These contaminants circulate through your ductwork if you don’t use a filter, and can gather on your blower motor, heat exchanger, and other parts of your system. Not using a filter can also reduce your furnace efficiency and cause you to have higher utility bills. Your furnace could overheat without a filter and in severe cases, could become a fire hazard. When you don’t use an air filter, your system might still work, but in the long term, it could cause significant damage leading to premature failure. The air quality in your home will be greatly reduced. To avoid these issues, make sure you use a clean filter in the proper size in your HVAC system and regularly replace it when it's dirty.