Does Air Conditioning Improve Indoor Air Quality?

On those beautiful spring and fall days, when it takes every bit of self-control not to throw the windows open and run away from work just to bask in the sunshine, we’re often reminded of just how stale our indoor air can become from a summer or winter of keeping our homes shut.  These times of year, so many people wonder if keeping their homes closed is really the best thing for indoor air quality, but experts say that air conditioning, when properly maintained, can improve indoor air quality significantly.

How Air Conditioners Help

Air conditioners are designed to take the air in your home, suck it through a filter, pass it over a very cold coil and push it back out through a series of vents.  Easy enough.  But during that process, your air conditioner and air handler are actually removing a great number of particles from the air and making your home a safer place to breathe.  The larger particles are caught by the filter before the indoor air even enters the air handler. Then the air handler pulls the water soluble particles out of the air, along with excess moisture.

Cycle after cycle, dust, debris and pollutants are brought into the system through the return air duct, where the air is cleaned and returned to the room.  If your air still feels stuffy, stale, or you’re still struggling to breathe, you may need to take a better look at the whole system.  There are several ways you can help improve your air conditioner’s ability to filter the air, including:

Changing the Filters Often.  It may sound overly simplistic, but the cleaner your filters are, the cleaner your air will be.  Check your filters at least once every two weeks and replace them as soon as they look dirty.  You may have heard that impacted dirt on your filter helps catch more dirt — but what this actually does is reduce air flow, making it harder for your air conditioner to clean the air.

Cleaning the Evaporator Coil.  Some furnaces are set up so that you can clean your evaporator coil yourself, while others will  require an air conditioning technician for the task. Either way, keeping a coil clean is vital to having clean indoor air.  Get your evaporator coil cleaned at least once a year and check it (if you can) every time you change the filter.

Tightening and Cleaning Ducts.  Ducts that are dirty simply blow more dirt into your home — the same goes for ducts that are open to the attic or crawlspace.  Ensuring that your ducts are tightly sealed and having them professionally cleaned eliminates a potentially endless source of dirt, dust and pollutants.

Choosing Air Conditioner Filters

If you’re trying to improve your indoor air quality with your air conditioning system, you also need to pay special attention to your air conditioner’s Minimum Efficiency Reporting Value (also known as the MERV rating).  As long as your system is rated to handle the filter you choose, you can target the pollutants that are really bothering you by choosing a filter woven tightly enough to capture the offenders.

Typical home filters have a rating of MERV 8 to MERV 13, though MERV ratings from 1 to 20 are often available for commercial customers.  These numbers mean the same thing no matter if you’re using a disposable filter or a washable electrostatic filter.  Here’s a quick rundown:

MERV 8.  MERV 8 is considered a “better” residential filter by most retailers.  These filters can catch mold spores, dust mites, animal dander and other fine particles like hairspray.  MERV 8 rated filters can remove up to 35 percent of all the dust particles in the air; they rate in the 90th percentile or above for dust removal when compared to other filters.

MERV 9  through 12.  With the ability to capture airborne particles as small as milled flour and automotive emissions, filters with MERV ratings of 9 through 12 are very good filters for improving air quality.  MERV 9 filters remove up to 45 percent of dust particles from the air; MERV 12 filters can remove as much as 75 percent.  Bigger isn’t always better, though — sometimes these filters create unnecessary stress on your air handler.

MERV 13.  If you have immune system problems, a MERV 13 filter may be for you — they can trap all types of bacteria, tobacco smoke and even sneeze droplets.  You can expect a filter in this category to catch up to 90 percent of the dust in the air, but have a pro check your unit to be sure it can handle the reduced air flow these filters can create.

Although an air filtration system will handle considerably more air cleaning than your air conditioner alone, if you simply want to improve your indoor air quality, all it takes is a little extra effort to keep dust out of your system, and changing your filters can make a big difference.  If your unit’s blowing more dust than it’s collecting, give the professionals at Precision Air a call at 1-602-349-6922.  We’ll clean your whole system on your schedule and improve your indoor air quality in no time flat.


Precision October 31, 2017

Share This Post:

erik - owner


We want to help you learn about about all things air conditioning and heating! Have any questions or want to see us write about something? Give us a call, chat, or email and we'll do our best to help you out.


  • APS Qualified Contractor
  • BBB Accredited Business Logo
  • SRP certified contractor
  • BoAir Electrostatic Air Filter
  • Arizona Healt Pump Council
  • Southwest Gas Corporation
  • Energy star logo
  • Electric League of Arizona

Testimonials & Reviews

See What Our Customers Have to Say

    • #
      Brett Walker

      I wanted to make sure my air conditioner was ready for summer. Fernando came out and made sure my unit was tip top. He was friendly, professional and not a sales man. Thanks Fernando!

    • #
      Jackie Barkenhagen

      Colin and Andrea were incredibly professional and knowledgeable. They did a great job representing the company. We will definitely contact them again for any HVAC needs that arise.

    • #
      Nick Corso

      We woke up in the middle of the nite on memorial day to a hot house. I called precision at 6am and they were here before noon. Simple problem fixed, cool house. I love these guys!

    • #
      Jeneen Piche

      Thank you Ray at Precision Air...the compressor on our AC went out last night and the house was HOT. This morning Ray was there to replace the compressor and had us feeling the cool air again in no time. Great customer service...quick response time and friendly from the first call until the repair was completed. Ray even offered to clean the filters! Thank you!!

    • #
      Cara Perlman

      I’m so glad I called Precision for my annual AC checkup!! Austin was professional, super friendly and answered all my questions. I’ve had more bad experiences with AC companies here in the valley than good ones. Precision Air will have all my hvac business going forward!! Thanks for being a reputable and honest company!!!

    • #
      Jeff Stanczak

      He did a great job; professional and knowledgeable! Kalin is the technician’s name and Precision Air and Plumbing should take a bow for hiring such an invaluable employee!!!

    • #
      Kingsley Evans

      Precision Air is a company of integrity. I signed up with them August 1st, 2019 for their AC maintenance plan for 2 years... Someone from their office called me a week ago to set up their yearly maintenance visit. SO GRATEFUL.

    • #
      Andrew Burkhart

      Precision Air and Plumbing is a wonderful company to work with! They are very experienced and professional. They have helped us in our home for many years via a/c service and air duct cleaning.

    • #
      David Topping

      It was time to replace our AC, and so our choice was Precision Air, as we've been with them for over 20 years. Teman & Julian did an excellent job on the installation today, arriving on time.

Contact Us

Feel free to contact us any time at 602-349-6922 for immediate assistance.

We offer 24 hour emergency service, and would be happy to schedule an appointment for you, or simply answer any questions you may have.

Precision Air & Plumbing

3045 N. Colorado St.
Chandler, AZ 85225

This field is for validation purposes and should be left unchanged.
© Precision Air & Plumbing 2021.