I'm setting up a plastic tub enclosure (36x18x6). Right now I've got a single heat pad (THG heat tape) regulated with a thermostat on one side that takes the internal surface temp of the tub to 90°F. However, I think I keep my house too cold and I can't get the cool side of the tub past 75°F. I'm considering adding another pad to the cool side and regulate its temp to 80°F. Does anyone see an issue with doing this?