Thought this was worth a separate reply; you also don't necessarily need to bring the washer inside, as long as you make sure there's no residual water in the pump. So you would disconnect the water supply, and then run the pump until nothing else is coming out. It should be fine to store in the cold as long as you do that. At least, that's what I've done when I keep it in the garage. If you're concerned, I would just look that up quickly to see if it's fine to store in. Really cool temperatures as long as you drain the pump.