- Mar 8, 2003
- 38,416
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i have a private air conditioning unit in the upstairs of my house. (central heat and air) and whenever it kicks in, the air coming out smells like sour eggs. there is nothing smelly going into the air intake, so it must be something wrong with the unit itself. it still cools the air but this awefull smell is driving me insane. it just started doing this a few months ago, and has gotten worse.