We have two heat pumps in our home. One upstairs and one down. When the downstairs furnace or air conditioner is on, the home is filled with a bad odor. Almost smells like something decaying, sewer or natural gas :eek: . We had the gas guy come and he couldn't find anything leaking. What might be causing this? I have scheduled someone to come clean my ducts but I am worried that it won't solve the problem and it is expensive. This has been going on now for over a year. I can't hardly stand to turn on the furnace or air conditioners any more.

Thanks for any help you can give me!

See this link


https://www.askmehelpdesk.com/heating-air-conditioning/rotten-egg-odor-coming-house-vents-93534.html