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Best way to clean mold from residential AC evaporator.

Posted on 1/11/25 at 6:54 pm
Posted by Swazla
Member since Jul 2016
1796 posts
Posted on 1/11/25 at 6:54 pm
A friend has 12 year old HVAC system. During a repair a technician said the evap core has mold. He sent me a picture and it looks to be on the bottom 20%. He said the only way to fix it is too change the coil for a lot of $$.

I looked this up on the net and saw techniques of cleaning it. Is this practical and effective? I think I need some opinions from some honest pros.

Thanks in advance,
Posted by damonster
Member since Sep 2010
2442 posts
Posted on 1/11/25 at 9:00 pm to
AC tech cleaned our coils with some type of chemical and a brush. Not sure what the chemical was but it stunk quite bit. This got the majority of it off. Then we installed UV lighting that is supposed to keep the coils clean.
This post was edited on 1/11/25 at 9:03 pm
Posted by Spankum
Miss-sippi
Member since Jan 2007
60589 posts
Posted on 1/11/25 at 9:37 pm to
There’s no way that I would replace a coil simply for some mold. You can buy some spray coil cleaner at the Lowe’s and use a soft brush. Be sure to not fold the fins over on the coil.
Posted by LEASTBAY
Member since Aug 2007
16337 posts
Posted on 1/11/25 at 10:36 pm to
Coil cleaner or some use dawn and water.
Posted by BasilFawlty
Baton Rouge, LA
Member since Dec 2014
1273 posts
Posted on 1/12/25 at 8:12 am to
Concrobium mold control. Sold a ton of it in 2016 and have used it in my own home. Spray on coils, use a soft brush then rinse. It kills any mold and mildew that it contacts.
Posted by LSU999
Member since Nov 2012
9220 posts
Posted on 1/13/25 at 2:54 pm to
You can also use simple green
Posted by Swazla
Member since Jul 2016
1796 posts
Posted on 1/13/25 at 9:53 pm to
Thanks for all the information!!!
Posted by White Bear
AT WORK
Member since Jul 2014
17261 posts
Posted on 1/14/25 at 8:02 am to
I would not use simple green on aluminum.
Posted by gumbo2176
Member since May 2018
19407 posts
Posted on 1/16/25 at 1:11 pm to
quote:

use a soft brush. Be sure to not fold the fins over on the coil.



This especially. Brush with the direction of the fins, not across it because they do bend very easily and that will inhibit air flow.
Posted by baldona
Florida
Member since Feb 2016
23407 posts
Posted on 1/17/25 at 12:58 pm to
The mold will die faster than the metal will be hurt. Set a tarp underneath of it to catch anything that falls. I'd spray it liberally and then rinse it off after 5-10 mins. Let it dry, and do it again if need be.

You can use a yard type of sprayer, maybe even dilute by quite a bit. On a 12 year old unit I would worry more about the mold than the unit, I mean what's the worst that can happen you need to replace it?
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