Ok Guys I own a box van now and it doesn't fit in garage do i'm parking outside now….I've found that I'm starting to have leaked hear and there…. I've read about putting a small heater in the box at night….BUT i'm very nervous about leaving a heater running in my ONLY unit…. ANY tips? is there a special covers made for weather? Do i flush out all hoses and machine? do I put anti-freeze in machine? Any help would be great!