I can't be the only one amazed the op wants to live in a home that's kept at 78 degreesThat's way too hot to be comfortable for me, and I've lived in south florida for over 10 years.
The easier solution, and coincidentally the one that keeps everyone satisfied, is to get a heating setup that allows the house to be at 74 degrees and still keep your snakes warm. I keep my AC blasting to try and keep the house around 74 degrees, but my aquarium still stays 92-95 on the hot side, low 80s on the cool side.