To clarify, I'm referring to the garage in our 5th wheel.
I purchased a small 700W radiator heater. Ran a test last night....temp dropped to 27. I just checked and the temp is well above freezing. The drinks are cold but not close to freezing. I forgot to put insulation where the water hose comes into the garage which is the only hole I can find that needs plugging. I will continue to drain the water lines, hot water heater, all tanks and add pink to drains. But this will take care of our drinks and other liquids, which is what I want to do.