Ok, with ambient temps like that in the room you'll need an additional heat source. I would use a UTH (heat mat) as well as your lights, BOTH REGULATED BY A THERMOSTAT (VERY IMPORTANT- are you currently using a thermostat?) You could also try CHEs (ceramic heat emitter). I would be happy to share with you what I do with my enclosures for the winter if you'd like. To briefly summarize, I use 1/2" foam board insulation. I use it to keep heat and humidity in the tank.