When Should You Check Your AC Filters?
admin • July 2, 2012

The filters on your Portland air conditioning unit are vital for keeping out the dust and debris that make things like illness, allergies and air quality worse. And it’s important that you take personal responsibility for checking those filters. Sure, you have a Portland air conditioning professional visit your home once a year to check the air conditioning, but you should also check the system yourself on a semi-regular basis for possible filter degradation.

Monthly Checks

So, how often should you check? Think of it this way. There is no such thing as checking too much , but you can easily not check often enough. So, we recommend checking your filter at least once every 4 weeks. It may not always need to be changed during that four week checkup (sometimes it can last 6 weeks or longer), but it’s good to take a peek.

Why is this so important? Because filters that haven’t been checked and changed as needed have a habit of building up excess sediment and debris. Not a problem when it comes to actually working, but a huge problem when it comes to your energy bill. The harder a system has to work to keep you house cool, the more energy it draws and the more you pay to have cool air in your home. And it will break down much faster as a result of overwork and dirty filters.

Changing an AC Filter

If your filter is ready for a swap, here are some quick tips to get the job done:

  • Find Your Filters – If you don’t know where your filters are, ask your contractor on the next visit or look near the return grills by the thermostat.
  • Remove the Filters – Open the latches and pull the old filter out to check it. You should be able to see clearly through a permanent filter and a disposable one should still be white. If this isn’t the case, it’s time for a cleaning/replacement.
  • Clean the Area – Clear the grill and area of any debris and sediment that might make the filter worse after replacement.

Proper filter maintenance only takes five minutes and it will save you money every month you run your Portland AC – not a bad deal for a few minutes’ work. For any more information about air conditioning system maintenance, give  Clean Air Act a call!

The Clean Air Act technician testing air purity for indoor air quality in Portland, Oregon home.
By Rodger Brown January 24, 2026
Need indoor air quality improvement tips in Portland, OR, this winter? Learn how humidity control, better air filters, and ventilation can help you breathe cleaner air all season.
A woman relaxing indoors during the holidays in a Portland home with clean, healthy indoor air.
By Rodger Brown December 31, 2025
Hosting more this season? Improve holiday indoor air quality in Portland with better filtration, duct cleaning, and HVAC support from Clean Air Act.
Outside view of snow covered Portland, OR to represent the need for furnace tune-up this winter.
By Rodger Brown November 26, 2025
Prevent breakdowns, reduce safety risks, and lower heating costs with a furnace tune-up in Portland, OR. The Clean Air Act keeps your home winter-ready.
An Alpine forest with mountains covered with snow.
By Rodger Brown October 27, 2025
Sealed homes trap pollutants in cold months. Change filters, book HVAC maintenance, upgrade to higher-MERV filters, and add a dehumidifier to manage moisture and prevent mold.
Clear Air technician performing a fall furnace tune-up and filter change in a Washington home.
By Rodger Brown September 30, 2025
Prep for cooler weather with a furnace tune-up, fresh filters, smart thermostat settings, and clean ducts/registers. Get practical energy-saving tips for Washington homes.
Wildfire smoke impacts indoor air too. Learn why changing your air filters during wildfire season.
By Rodger Brown August 26, 2025
Smoke and wildfire in Washington representing why checking HVAC air filter is important.
Show More