A dingy smell is the most common smell found in ACs. If your AC smells musty, the most likely cause is the build up of water in the drain pan or drip lines, which can cause mold or rot.
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Why is my AC blowing out stinky air?
Air conditioning can blow bad smelling air because of mold in the system. There’s air circulation in the area because of your air conditioner.
Why does my AC smell like sewer?
A sewage smell coming from your air conditioner can be a sign of a dangerous problem. If you smell sewage when you turn on your A/C unit, your sewer system may have backed up, and the smell may come from a broken pipe.
Why does my AC smell like a fart?
A gas leak in your system is most likely to be indicated by a smell like a skunk. The smell of a gas called methyl mercaptan could be coming into your ductwork and making your home smell like a spray park.