I am highly against the screen cages, I woulden't want to even TRY to keep humidity and heat up to par! I would only use these in a room that is tem and humidity controlled so the cage dosen't need to be, if you use them at all. All the "plastic" type cages (visions,ect...) seem to work the best! I will ba building my own out of plywood, but if want to buy I would get a vision. At least 36" by 18".