I will have to let Gus help you on the climate cos I live in MN! But my trick is to grow the lowland plants in the warmest part of my house. Which happens to be where the dining room table used to be. Now I don't have a dinner table but 2 large neps tanks instead! [img]http://www.**********.com/iB_html/non-cgi/emoticons/biggrin.gif[/img]
I personally would go with the electric heat mats underneath the terrarium if relocating in the warmest part of your house is not an option or if the warmest part of your house is not at least 70*F at night. Ive heard bad things about aquarium heaters. I've never used one again after returning home from an xmas party to find my natural aquarium full of dwarf cichlids and banjo catfish boiled to death from an aquarium heater that stuck on!