I have a Crusair 7000 BTU that is currently disconnected because of an electrical issue with it. I have a second 12,000 BTU unit that has been heating/cooling the cabin quite effectively so I haven't been motivated to repair it. Both units share the same pump and plumbing. I still have to winterize the thing and connecting it back in to power isn't going to work. Do I need to have the unit working, or is there a way to blow air through it or something else? Thoughts?