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Question DetailsAsked on 3/18/2015

Mystery house smell for a year!! It was tolerable over the winter but bad again on first 70 degree day.

Happened first time year ago when snow covered vent pipe on roof....hasn't stopped completely since then. Ran water down vent pipe, no obstruction. Opened sewer clean-out valve, used gas meter, no gas coming out. The smell comes and goes, every place in the house....moves around. When putting nose over register, not coming from there. Thought maybe coming from attic, which when got hot in there for first time this spring, maybe mold smelling worse. Put exhaust fan in garage window, opened hatch to attic, no smell coming into garage from the opening. Please, someone give us a clue.....have read all could find on internet, and tried everything!!! Definitely does not smell like sewer, definitely not like dead animal.....smells kinda musty, maybe like wet dirt/leaves, but not exactly. Very hard to explain. Over the winter, it was tolerable......could sometimes go for hours without smelling it, but it was very bad first warm day (and furnace did not run.)

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1 Answer


I can answer my own question......figured it was an ozone leak coming from outside central air conditioning unit. I bought an air purifier hoping to help with the smell I couldn't find....when turning on the ozone producer part of the machine I, that smells a lot like the odor I've been smelling all this time! Online found tip to looking for electrical arcing somewhere (that would produce ozone).....take an am radio around and listen for static. Found it coming from the air conditioner into the furnace. Shut off power to ac at the electrical box, no more static, and no more smell !! Can't really fix it myself, but at least can point air conditioner guy in the right direction without spending hundreds of dollars searching for where the smell was coming from!!

Answered 5 years ago by joysocute

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