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Rating Newest Oldest. Best Answer: The can gets cold for the same reason that any other refrigeration unit gets cold. (eg air conditioner, refrigerator, dehumidifier). Inside of the can, there is a chemical which can be used as a refrigerant. It's a chemical with a low vapor pressure. When you press the button on top of the can, you open a valve and release some of the pressure from the can.
Evidence of this is the cold draft and smell you are experiencing. The fireplace damper is often the path of least resistance for air to enter the home. So if you run a kitchen vent fan or bathroom fan or anything else that exhaust air out of the house your home will start sucking air down the chimney. To fix this issue you can put in a chimney balloon low by the damper and that will seal the fireplace flue tight so the smell and draft cannot enter. I have used the clear balloons since they come in plenty of size variety. This should take care of the smell and cold draft in one shot.