In general, most air filter manufacturers and HVAC companies recommend changing your air filter every 90 days or 3 months. This may vary depending on the location of your home, if you have pets, and the age of your system and equipment. Older systems often use fiber air filters, which should be replaced every 30 days. Newer systems typically use pleated filters, which should be replaced every 90 days.
If you don't have allergies, you can replace them every 45 days for maximum efficiency. A clear sign that the AC filter needs to be replaced is when the back of the unit is too hot. This is because a clogged filter forces the air conditioner to work harder to keep the house cool, leading to more frequent repairs and a shorter life for the unit. To reduce this load, it's important to change the AC filter regularly.
According to ENERGY STAR, you should check and change your air conditioner filter every month during peak season. If you know how to change the AC filter yourself, this is a job that you can take care of on your own. However, if you're unsure, it's best to ask your HVAC service technician for help. If you want to improve the air quality in your space by eliminating pollen, mold, and other harmful contaminants, you should invest in HEPA filters with a MERV rating of 10 or higher.
How often you need to change your air filters depends on how often you use your home. For a little-used vacation home, you could get away with changing filters once a year. However, for a typical suburban home, you'll probably want to change filters at least every 90 days. When reinserting the filter into the housing, make sure the arrow points away from the return and toward the air handler.
If you live in a mild climate and only use your air conditioner or heater for a few hours a day, a filter could last the entire season or up to an entire year. It's important to know when to change your air conditioner filter in order to maintain optimal efficiency and indoor air quality. As a general rule, it's a good idea to replace the air filter in your HVAC system every month. If you have pets or allergies, it's best to replace it every 6 weeks.
If you're unsure about how often you should change your filter, consult with your HVAC service technician for advice.