My grandpa has a greenhouse where he houses over a thousand different orchids. It has all sorts of monitoring systems, misters, hygrometers, heaters, etc, and he has kept frogs in there as well. The only issue was feeding. There aren't that many insects in a greenhouse and there's an abundance of space where you'd need to look in order to find the animal you're housing. If you want I could ask him the specs of his greenhouse, how it's insulated, and much more.