I have one UTH with thermostat on my 40 gal breeder tank and have no problem keeping that side at the recommended 85F but the cold side is constantly below 70F. I have a space heater now keeping it at around 74-78F but they eat a lot of electricity. I was wonder what you guys/gals think of putting another large UTH with thermostat on the cold side and setting it to 75F. I am thinking because they use a fraction of the power that I would save $$$ and regulate the tank much better. Any thoughts or issues I haven't thought of?