There's nothing quite like getting into a warm car with the windows defrosted. I have been using these heaters for many years. As a first aider, I have to be ready at all times. It keeps my truck warm and clean. Keeping the cabin warm also helps conserve plastics in new cars. In the summer they dry out, and the winter cold compresses them, causing cracks in the plastic. don't worry about the heating. He drove into my son's car. No more worrying about cleaning frozen windows when you rush to school. (Safety) We put him on a timer so he warms up before he has to leave. Works perfectly!