First and foremost please keep in mind a UTH will do nothing to heat the air in the tank. If the room temp is less than 80 degrees you prob need to add a secondary heat source to keep ambient temps up. I use heat lamps on rheostats and a thermostat just for ambient in addition to UTH for hot spot.
Heat lamps are great but will dry out the tank, you can cover the top partially to help. When I had a 20 gal I got a sheet of plastic like they use for fluorescent light covers and drilled holes and suspended lamps above. Worked perfect for heat and humidity was not impacted. There are plenty of alternatives. The goal is to reduce the amount of the top open to the air but still have adequate ventilation.
Also if nothing else make sure to have a thermostat for UTH, despite what the packaging may say this is not optional.
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