I have a 6 month old sulcata, and i keep it in a 2ft by 4ft tortoise table in my bedroom. my house is typically at 76 degrees during the day. i have a 25w uv light and a 25w fluorescent light that i keep on between 8am-6pm. at night my house reaches temperatures as low as 68 degrees. it's a large house, and expensive to heat. so it there any ways to keep the enclosure warmer? im afraid my tort will get sick from being too chilly..