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.
Sure thing! Ever since I set up his terrarium, my room temp has stayed the same (78 degrees). My thermostat should be arriving here soon actually
What do you do with your enclosures during all the other seasons as well?