My civic puts out ample heat and it gets darn cold here in the winter. It takes about 5 minutes or so for the engine to warm up. Some cars just use electric heaters until they warm up. And of course the old volkswagons used to use a gasoline heater .

So I don't know if such an idea would be very cost effective.

My hydroponics experiment

You ever notice how hard it is to lip read cartoon characters?
"Crazy is what the sane call Delta Flyer"