Here’s an odor you don’t want floating around inside your house: a moldy stench that smells like a pile of dirty socks. It seems to be coming from the air conditioning vents. What’s causing it and what can you do about it?
It won’t shock you to learn that what you’re experiencing is a common problem with air conditioners known as “dirty sock syndrome.” Yes, the people who named it knew exactly what they were talking about. No, nobody has tossed a bunch of dirty socks into your HVAC system (I mean, we don’t think so). But the odor is coming from the same source as smelly socks—bacteria from microbes. You’ve got a source of it in your AC, and we can probably guess what it is. Below we’ll talk more about how dirty sock syndrome happens in an air conditioner and what you can do about it.