When Should I Change My Air Conditioner's Air Filter at Home?
Want the quick answer? Read our FAQ on "How often to change the air filter".
- Determining just how often to replace your furnace or air conditioner filter.
- Remembering to change air filters when needed.
When To Change Your Air Filters
Most filters have a printed "expiration" date on the box or plastic. It may read "Lasts up to 3 months" or "Change filter every 90 days". Check out the filters at the store and you'll see that some are designed to only last a month, while other manufacturers (like Honeywell) have produced media air cleaners with filters meant to be swapped once every 6-12 months. The standard seems to be once every 3 months for most higher quality filters, but we have a rule of thumb that we tell our customers to go by. If the filter is dirty, change it! A dirty air filter can add or cause damage to costly components, like your compressor, so it's recommended to change it out more often than neglect it. If you want to stick to the manufacturer's recommended limit, we suggest marking the date on the filter when you swap it out, and programming a reminder for yourself in your phone or on a calendar. Keep in mind that your filter manufacturer might have a different recommendation from your HVAC system manufacturer.
Determining how often to change your air filters hinges on several factors:
- Which air filter your system requires
- The collective air quality of your Austin area home
- Pets – Cats, dogs, birds, etc.
- Occupancy of the home
- The level of air pollution and construction around the home
For your standard 1"-3" air filters, the manufacturers basically tell you to change them every 30-60 days, which is really a great rule of thumb. Still, general guidelines are not applicable to all. If you suffer from light to moderate allergies, you might need to upgrade your air filter or change them even more frequently than OEM specifications. On the other hand, if you're in a remote area, own a infrequently occupied home (like a vacation home) or an area with few automobiles and trucks, changing your air filter every 12-months may be quite sufficient. Why do pets matter so much? They have a tendency to shed, which can clog your air filter quick. Clearly, the air filter is just doing its job by containing pet hair and dander, but exceptionally dirty filters can cause weak HVAC performance.
- Infrequently occupied home or single occupant homes without pets or allergies: Change 6-12 months
- Average suburban home without pets: Change every 90 days
- Got a cat or dog: Change every 60 days
- More than one pet or have allergies: Change every 30-45 days
How To Remember To Change Your Air Conditioner's Air Filters
It's simple; sign up for the Service Experts Email Club. When you do, you can elect to receive (or not) great email coupons and newsletters with a lot of tips and discounts on AC repairs and tune-ups. In addition, your email subscription preferences let’s you set a reminder to change your Austin area home's air filter every 30, 60, 90, 120 or 365 days, or the date of your choosing.
How to replace your return air filter
Most people know how to replace the air filter in their system, but some homes have an additional filter in the return ducts. Whether you have one or not is dependent on which HVAC system you have. Your system is made to handle a set amount of pressure in your home, and the more filters you have the more the blower motor works, which can shorten the life of your system if it isn't designed for it. Learning whether you have a return filter and replacing it is a piece of cake:
- Locate your return air vents.
- Some covers have screws and some have tabs. Unscrew or pull tabs to remove from the wall.
- Check for a filter. If one is inside, pull it out and write down the size.
- Verify the filter type is the one recommended by the manufacturer.
- If filter is dirty, replace with the manufacturer's recommended filter of the same size and type.