Maybe there is something wrong with yours or you have animals who have urined somewhere in your house.
An air conditioner should not smell like smoke when turned on (or when turned off). I would have to suspect that the electrical insulation is burning.
A smell coming from a reverse cycle air conditioner may be a signal that the filter needs to be cleaned. A smell like engine exhaust might be present if the air conditioner motor is in need of repair.
because you have too many dead babies in your air conditioner tank
Failed compressor
It sounds like there is a leak inthe evaporator section of your air conditioner. If this continues, the air conditioner will no longer cool and you may have to replace several components of the system. The smell is that of atomized esther oil.
Air Conditioning compressors have heaters in them to keep the oil warm year round. A critter or two may have discovered this source of warmth and moved into your condensing unit for the winter.
It sounds like there is a leak inthe evaporator section of your air conditioner. If this continues, the air conditioner will no longer cool and you may have to replace several components of the system. The smell is that of atomized esther oil.
Cats spraying your car with urine.
if u would have noticed the onion smell comes only when you cut onions .
Unless someone peeded into your inlet vents, next guess is are you a smoker??
sounds like your air conditioner compressor is bad.
The belt that runs the fan may be wearing out.