When Should I Change My Air Conditioner's Air Filter at Home?
Looking for the quick answer? See our FAQ on "How often to change the air filter".
- Understanding just how often to swap out 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 say "Lasts up to 3 months" or "Change filter every 90 days". Look around at the store and you should see that some are designed to only last a month, while other manufacturers (like Honeywell) have released 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 recommend our readers to go by. If they're dirty, change them! A dirty air filter can add or cause damage to costly components, like your compressor, so it's better to change it out more often than neglect it. If you want to follow the manufacturer's recommended limit, we suggest writing the date on the filter when you swap it out, and adding a reminder for yourself in your phone or on a calendar. Keep in mind that your filter manufacturer may have a different recommendation from your HVAC system manufacturer.
Figuring out how often to change your air filters relies upon several factors:
- Which air filter your system requires
- The entire air quality of your Denver area home
- Pets – Cats, dogs, birds, etc.
- Occupancy of the home
- General air pollution in the Denver area or construction taking place nearby
For your typical 1"-3" air filters, the manufacturers basically suggest to change them bi-monthly, which is really a great rule of thumb. Still, general rules aren't always for everybody. If you have to endure 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 less occupied home (like a vacation home) or an area with little auto traffic, replacing your air filters each year may be quite sufficient. Why do we call out our beloved pets? They have a tendency to shed, which can clog your air filter quick. Of course, the air filter is just doing its job by capturing pet hair and dander, but tremendously dirty filters can cause seriously reduced HVAC performance.
In summary:
- Seldom used home or single occupant homes without pets or allergies: Change 6-12 months
- Typical suburban home without pets: Change every 90 days
- Got a cat or dog: Change every 60 days
- Multiple pets or have allergies: Change every 30-45 days
How To Remember To Change Your Air Conditioner's Air Filters
Service Experts Heating & Air Conditioning offers a simple solution; sign up for the Service Experts Email Club. This is a convenient way to get money-saving discounts and other helpful information on your smartphone, tablet or desktop. Also, your email subscription preferences let’s you set a reminder to change your Denver 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 of you know how to replace the air filter in their system, but some houses have an extra filter in the return vent. Whether you have one or not is dependent on the HVAC manufacturer's recommendation. Your HVAC is engineered to handle a set amount of pressure in your home sweet home, and the more filters you have the fiercer the blower motor works, which can reduce the lifespan of your system if it isn't designed for it. Finding out whether you have a return filter and replacing it is easy:
- Go to your return air vents.
- Some covers have screws and some have tabs. Unscrew or pull tabs to take off the wall.
- Look for a filter. If one is there, 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.
