Is It Safe to Sleep in a Parked Car with the Heater On?
1 Answers
It is not safe to sleep in a parked car with the heater on, for the following reasons: 1. When the engine is running, incomplete fuel combustion produces high concentrations of carbon monoxide. While driving, air convection through the ventilation system keeps CO levels low; 2. When the vehicle is stationary with heater running and windows closed, exhaust-borne carbon monoxide accumulates to dangerous concentrations; 3. In winter, many owners keep windows closed with heater running for prolonged periods. While this maintains warmth, it creates severe air pollution inside the cabin.