When Should I Change My Air Conditioner's Air Filter at Home?
Need the quick answer? Check out our FAQ on "How often to change the air filter".
- Understanding just how often to change 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 packaging. It may read "Lasts up to 3 months" or "Change filter every 90 days". Pay attention at the store and you'll see that some are engineered 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 norm seems to be once every few months for most higher quality filters, but we have a rule of thumb that we suggest our readers to go by. If it's dirty, change it! A dirty air filter can exacerbate or cause damage to expensive components, like your compressor, so it's recommended to change it out more often than not. If you want to follow the manufacturer's recommended limit, we suggest writing the date on the filter when you swap it out, and setting 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.
Figuring out how often to change your air filters hinges on several factors:
- Which air filter your system requires
- The overall air quality of your Rochester area home
- Pets – Cats, dogs, birds, etc.
- Number of occupants in the house
- General air pollution in the Rochester area or construction taking place nearby
For your typical 1"-3" air filters, the manufacturers basically tell you to change them every 1 or 2 months, which is really a great rule of thumb. However, general guidelines are not applicable to all. If you have to tolerate light to moderate allergies, you may need to upgrade the air filter or change them even more regularly 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 little auto traffic, annual replacement of your air filter may be quite sufficient. Why do pets matter so much? They have a tendency to shed, which can clog your air filter quick. Naturally, the air filter is just doing its job by trapping pet hair and dander, but exceptionally dirty filters can cause weak HVAC performance.
- Vacation home or single occupant homes without pets or allergies: Change 6-12 months
- Common suburban home without pets: Change every 90 days
- House with a pet: Change every 60 days
- Several pets or have allergies: Change every 30-45 days
How To Remember To Change Your Air Conditioner's Air Filters
Here’s an easy way to stay on top of this; 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. But wait… there’s more, your email subscription preferences let’s you set a reminder to change your Rochester area home's air filter every 30, 60, 90, 120 or 365 days, or any date you find most convenient.
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 additional filter in the return ducts. Whether you have one or not is dependent on the HVAC manufacturer's recommendation. Your unit is engineered to handle a set amount of pressure in your home sweet home, and the more filters you have the more the blower motor works, which can decrease the life expectancy of your system if it isn't designed for it. Discovering whether you have a return filter and replacing it is simple:
- Find 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 note 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.