Bump up your house's heat, should help. I used to use my wifes heating pad on the cool end of the enclosure just pressed against it and it did help with ambient temps ( didn't need thermostat as it was a very weak heat pad for women cramps lol. It was just enough to heat the inside up to 79-83f) inside the tank tremendously. Some people also use tiny heaters just beside the cool side of the tank and that works too. Unlike heating bulbs your humidity isn't shut down. And for the warm side UTH with thermostat set to 90f.
Well I was under the impression you already had UTH heating but if you only have lamp then dont get rid of it. Tough situation.
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