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AC Musty Smell

June 20, 2015, 10:30:14 am

A few months ago I thouroughly cleaned both coils of each AC unit which resulted in clean, fresh air from the units.  However, over the past 6 weeks or so with humidity levels in mid 80's to 100% range on most days, upon initial startup, I have noticed a slight musty smell.  Evaporator coil on each unit appears clean.  So my question is, does anyone have knowledge of a coil cleaner that I could spray on the coils for maintenance that might kill any mildew / mold and restore clean fresh air?  Any input would be appreciated.

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Re: AC Musty Smell

Reply #1 – June 20, 2015, 10:41:02 am

Most box stores sell evaporator cleaner.  Do not use condenser cleaner-- it is meant for outdoor use only.

And, yes, sadly with high humidity and the "less than effective" filters, these things do need periodic cleaning.

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Re: AC Musty Smell

Reply #2 – June 20, 2015, 05:34:26 pm

Thanks Brett, 
I found a foaming cleaner at Home Depot that worked very well but required rinsing with water.  Since coils are visibly clean was hoping to find something I could just spray on that would kill the mildew.  But I'm always looking for that big "easy" button...maybe not this time?

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Re: AC Musty Smell

Reply #3 – June 21, 2015, 08:57:43 am

Bill,
  Here are some evaporator cleaner products from a company whose reputation has been earned by HVAC professionals.


Evap-Fresh No Rinse

Bio-Fresh cd

good luck,

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Re: AC Musty Smell

Reply #4 – June 21, 2015, 11:32:16 am

Thanks Rick!
Both of those products are just what I'm looking for.  I will get one or the other tomorrow, or order, and give it a try.  Grainger carries that product so should be able to get quickly.

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