with just a UTH its hard to heat an entire glass tank. just make sure the UTH is only getting as hot as 92. for ambient temps you can always tape off the enitre lid of the tank and cut a hole to leave the light on. then just get a rheostat/dimmer and you can leave the light on all the time if you want. the only problem then is that you are going to drain your humidity, which is why a lot of people hate tanks and eventually switch to something else