I was looking online at a coleman electric soda cooler (Like a regular cooler to take camping or on vacation). *Two holes could be drilled in the lid and a water pump could pump chilled water through thin walled plastic tubing that snakes through a terrarium and then returns the water into the cooler via the other hole. *This system wouldn't effect the humidity the way an air cooling system would. *A similar model made by igloo claimed it could keep the water 47 degrees (F) cooler than the room temperature. *At $68 (for the coleman cooler, $120 for the igloo) this system, if it works, might be an affordable cooling solution for a highland terrarium. *Has anyone tried this or something similar?