When was the last time you changed your air filters?

Home Inspector with Complete Home Inspections, Inc. TN Lic#050

When was the last time you changed the air filter in your furnace or HVAC unit? Depending upon the filter and type, if you can't remember, then it is probably time to do something.

Here are a few facts about air filters:

  • Spun glass filters only stop about 10% of the dirt and need to be changed every 30 days! What happens to the rest of the dirt? Check your coils and ductwork! Can we say Yeech?
  • Dirty air filters of any type can greatly reduce the efficiency of your system. It has to work harder to either heat or cool your home, wasting energy and also can reduce the life of the unit. Dirty air filters can also lead to cracked heat exchangers in gas-fired units.
  • Washable type media is OK if the media opening is sized appropriately. Some washable medias such as the one in the background are too restrictive when clean much less dirty. If you are using such a media, consider replacing.
  • Paper medias which can be purchased in most home improvement stores, in my opinion is the best. Depending upon the type and manufacturer, these medias need to be replaced every 30-90days.
  • The BEST type of media is the 4" thick media. The initial cost is higher, but these can last about 9 months to a year depending upon size and application. Search for Honeywell Return Air Media using your search engine browser.
  • MERV ratings are important. The higher the MERV rating the better the filter is at trapping dirt and and other air-borne contaminants. The minimum MERV rating I suggest is 8.

If you find this information helpful, feel free to pass it on to a friend or colleague.

This posting and the continents written here are the intellectual property of Michael Thornton of Complete Home Inspections, Inc. providing Nashville home inspections for Brentwood and the Davidson and Williamson Counties of Middle Tennessee. The views and opinions expressed are just that - views and opinions of Michael Thornton and those who comment.  This post is part of the ActiveRain Real Estate Network, which is a social network highlighting the best of Web 2.0.  Information is provided with the intent of educating and assisting home owners, home sellers, home buyers, real estate investors, and real estate professionals with information the can be used to make better real estate decisions. 

For other postings go to chiblogs.com



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Julie Chapman
DR Horton - Lakeland, FL
New Homes Sales Lakeland Florida
Michael, Thanks for reminding me.......both my homes and my office need to have them changed......
Dec 28, 2007 11:30 PM #1
David & Lisa Webber
RE/MAX Executive - Crofton, MD

Great timely reminder Michael...  Good excuse to e-mail clients as well....

Dec 29, 2007 12:00 AM #2
Larry Brewer - Benchmark Realty llc
Benchmark Realty LLc - Nashville, TN
Good post, I see you were up early this morning.
Dec 29, 2007 12:03 AM #3
Brian Corwell
RE/MAX Sauk Valley - Sterling, IL
Sterling, Illinois Real Estate

That would explain the thin haze of dust floating in the air in the house...lol...But it brings up an excellent point to add to any monthy mail that is sent out to your client base...and can help keeping more money in the house and less to the gas company

Brian Corwell

RE/MAX Sauk Valley

Sterling, Illinois Real Estate

Dec 29, 2007 12:34 AM #4
Melissa Grant
A Serendipity World - Greenbackville, VA
The Law of Attraction In Life & Business
This is great info ! Like David & Lisa Webber, www.webberteam.com said, it is a great excuse to email past clients !
Dec 29, 2007 12:35 AM #5
Charles McDonald
Charlottesville Real Estate Solutions - Charlottesville, VA
REALTOR®, Blogger, Principal Broker®, Owner

When the filters are on the returns, is there a better solution. Can you email me?

Hope you have a wonderful New Year!

Your friend in Charlottesville!

Dec 29, 2007 12:52 AM #6
Amanda Evans
DFW Living - Fort Worth, TX
Real Estate Broker - Fort Worth Texas
Thanks for the reminder! We are overdue to change filters around the Hall household. 
Dec 29, 2007 01:04 AM #7
Eldon Holliday
National Property Inspections - Olive Branch, MS

Michael,  I'm an inspector just south of Memphis.  I don't have to tell you about all the pollen and junk we have here.  I always check the filters during an inspection, I also note the size in the report and let the buyers know how to change them.  Some of the first time buyers have never changed a filter before.

On another note, in your picture is that your company truck your standing in front of?

Dec 29, 2007 02:17 AM #8
Jacques Mountain
Dream Home Inspections/203K Consultant - Fayetteville, GA
Inspector/203K Consultant

This is some of the best info I have seen on air filters.

Oct 01, 2008 02:49 PM #9
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