I know what it's like dealing with the temps. I have my cage wrapped cuz it's not warm enough but I'm still runnng80's in the warm corner, ambient 76. I have a standard heating pad on low in sleeping corner with 50 watt grow light, and 24 inch 5.0 grow bulb. The hood and such will give u 5 degrees. Spot lamp gets glass up to 85/90 so they can cling to that if they want. I'm thinking maybe ur soil is too thick over heating pad. I got mine covered with small stones(glued together) to make more heat. With just 2" of moss over spot I couldn't feel any warmth over it. If u have screen lid cover half of it to trap heat lights will create. I had terrarium set up month before I got frogs. Bu thit with that-20 weather the day after I got them home. any thing can happen up north, keep blankets and extra heating pad ready!!! Also location location.