Hi, With the way the temps have been lately im not surprised your having problems. If you have a dome to put a bulb in I would suggest to buy maybe a 40 watt red bulb or night bulb to help bring the temps up. Either one would work because by the sounds of things you will need to keep it on at night. If you cant get a thermostat I would buy a dimmer from good old walmart or home depot. Or you could buy a dome with a dimmer on it.