No, sleeping in a car with the windows closed is generally not safe. The possibility of carbon monoxide buildup in the cabin as a result of an exhaust malfunction or obstruction is simply too great when the engine is running.
What is carbon monoxide poisoning?
Your body replaces the oxygen in your red blood cells with carbon monoxide when there is too much carbon monoxide in the air. Serious tissue damage or even death may result from this.
Unvented space heaters are the most frequent cause of CO poisoning in the home.
Combustible fuel and interior air are used in an unvented space heater's heating mechanism. Instead of venting the gases it produces outside, it does so inside the room.
Therefore, it is false to use the heater or air conditioner in a parked car with the windows closed.
Learn more about carbon monoxide here:
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