(I posted this under residential and then found that there is a column for air quality, so I have copied the same message to here. -Apologies for posting in wrong place.)
Please help. I am getting a terrible smell like a dead animal from both my air-conditioners. This has been occurring on and off for the last five years. It only happens in the summer when it is hot and humid.
With my three ton Trane gas heat air-conditioner, the smell occurs when the unit is working and can be smelt in one or other of my sons bedrooms.
Last year I engaged a mould specialist to tell me what to do. He stated that I should just replace the piping and boxes to the rooms that are affected.
I replaced the piping and the boxes, and for good measure, also replaced the supply plenum and sucked all the debris and water out of the bottom of the air handler.
The smell still reoccurred. I then sprayed the coils with a mixture of bleach and water and this seemed to solve the problem. However, by this time it was late autumn and the hot season was almost over.
This spring the smell started again. I sprayed the evaporator coils again and also poured a cup of bleach into the bottom of the air handler. This worked for a week and then the smell started again last night. What can I do?
My two ton unit on my ground floor smells terribly when it is not blowing/operating. The smell comes from the return pipe. This also occurs when the weather is hot and humid.
The mould specialist told me on this unit that all I had to do was seal a small leak in one of the plenums and that this should solve the problem. This seemed to work the last year, but this year the smell has started again and it is really terrible.
Any suggestions will be highly appreciated. I have no recourse to any of the actions that the mould specialist suggested, as he is a friend of a friend. Also at the time he was here, the units were not smelling. Thus I am really on my own with this one. I also have just sold the house, and the new owners take occupation with in three weeks. Therefore I need to take action really quickly.