Thank you so much! I was having trouble picturing it, now that I know what to look for I shouldn't have too much trouble finding something like that.
Is a heating pad on one end on the bottom enough? I would use a thermostat of course to make sure the heat was constant.
It really depends on your house temperatures. An ambient temp of 75* and below is not really a good idea. If your house doesn't get hotter than 72*, you might need a second UTH which you can use with the thermostat and a dimmer.