I had an old wool Army blanket and a drop light with a 100W bulb that Winter. Car not garaged. Drop light went between the block and the radiator and the blanket over top of the engine compartment to hold in a little heat. Made a BIG difference on the car starting in the AM.
Yep. Back in my working days I did the same. Kept the battery from freezing and it kept the oil warm enough to turn the engine. Also kept ice from forming in the carburator.