Tree Frog Heat Tips?

[emseeKAY]

so my gf's father asked me to help him with his red eyed tree frog and i was wondering, the room that he wants him in gets rather cold at night so we would have to leave the heat lamp on, but when we do this the frog will NOT get up at all, whereas when we turn the light off you can hear him moving around and going after the crickets, etc. what could i do, i thought about getting a night heat lamp? any insight would be greatly appreciated as always!