I have a artesian santa cruz 3 person spa. I just moved it to a new home and am will be having installed this weekend, so right now it's sitting in the back of my trailer. The next couple of nights it's going to be down to the upper teens. It is drained and I blew out the nozzles, etc with a blower. The question is do I have to worry about the tub for the next couple of nights in these sub freezing temperatures? I was thinking of putting in a space heater for the next couple of nights to keep it warm, would that help, or needed? Thanks