Out of curiosity how well do these work for heating an enclosure? I am working on building enclosures that are going to be 36" x 24" x 12". I am trying to estimate the most cost effective way of heating the enclosure. Currently every snake is in their own tank with screen mesh top and a light. (well two lights but only one is on at a time). I can't do a rack system since my house is old (1882 ish) and keeping ambient room temperature up would be very difficult.