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Question DetailsAsked on 8/5/2012

What could be the cause of a musty odor ina house that does not have a visable mold problem? The odor is more evident with air conditioning

What can cause a muosty odor ina house?

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2 Answers


What you have is what we call an impacted evaporator and a clogged drain line. to explain the odor comes from your evaporator that has standing water in the pan that is not draining. Find a trusted tech to pull and clean your evaporator if you have a split system, or acid wash your evaporator if you have a package unit. and make sure he blowout your drain pipe so the water has a fast track out of your system. whatever the cost is you will happy to find out that your electric bill will go down helping to offset what you paid for the cleaning.

Raymond Gonzalez
koolray heating and air


Answered 8 years ago by Raymond Gonzalez


As mentioned above.Chances are your "indoor coil and blower" are in need of cleaning as well as the drain line.

I'd start with a "clean and check" of your system, check Angie's list for an HVAC contractor . This is a relatively low cost service, ,just be sure they include,cleaning coils and drain line, some advertise 49 point check-up, checking things is needed ,but cleaning is more important,if you had to choose.

Ask how long it will take them, if it's not over an hour, they will just be checking things, not cleaning.

In rare cases you could have mildew/mold in the duct system,so ask them to take a look.

UV (Ultra Volet) light(s) installed over the indoor coil, will keep the coil clean, bulbs to be replaced each year.

The cleaner you keep the coils,the lower your power bill will be!!


Answered 8 years ago by BayAreaAC

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