Ok, UTH's need to be regulated so they do not get too hot. A rheostat, thermostat or proportional thermostat is needed. Rheostats really need stable room temps to work so they are likely not a good idea as you sound like the room is unregulated and cool. Look at thermostats there are lots of posts on them or start a new thread about them.
The other issue is the ambient temps typically 80ºF is a 'normal' target point for that . The simplest way to get there is to heat the room to 80. This is also likely to solve all the too cool heating issues. That may not always be the possible. The rest is a complete balance of basically trying to heat a small space in a controlled way to that target. There is not many simple solutions the typical methods are to reduce heat loss (insulation) and adding some secondary heater to lift the ambient air and surface temps to 80 then the uth to lift one part to 90.
insulation alone usually is not enough and a secondary heater sometimes is not either it takes both. The cooler the room the more difficult the task is.
The height of the tank is often an issue the heat rises and dissipates, Open tops don't help but you still need ventilation too so again a careful balance. Some will say plastic tubs but they don't insulate at all and limit secondary heat options so for a cool room (let me guess your room is 69-75?)
A side turned tank might help if you have the ability to make a 'plug' for it. I use a fluorescent light inside to help heat the air some. That might also help and lots of insulation to hold as much of that heat during the night as you can.
77ºF is a bit cold but not completely horrible 78 would be better that isn't that much really. Insulation might do that but you need a tstat!
http://ball-pythons.net/forums/showt...arium-Solution
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