I am having trouble setting my tub up I dunno what size tub I needed so I just got a sterilite 31 qt from walmart and an UTH under one side I have a rheostat dimmer and a 500R but neither are getting the temps right. my accurite is reading 74% humidity 83.8 on heated side and 81.9 on cool side and the pad is on high. what am I doin wrong! I don't know if it is my air in the house fluctuating cuz my air isn't working the tempurature in the house just flows with what climate is like outside! Help...............