So my place is huge and my roommates are not keen on the idea on the huge bill it will take to keep the whole house at 75 degrees. So to solve this problem my chinchillas have their own fairly small room. I have made an air cooler by getting a 5 gallon styrofoam cooler, cutting a hole in the top and putting a 3in. curved PVC pipe in it then cutting a hole in the other end of the top and placing a 6in fan in that hole. Then I place a gallon of frozen water in the cooler along with a few frozen bottle of water. When I turn the fan on it pushes the cold air out. When checking the temperature it seems to cool the room down decently when its not boiling hot outside. Outside it was at 80, the house was at 78 and the chin room was at 66. When it gets hotter outside I want to make sure that the chins stay cool so I want to build one more cooling system. Is the way I have done my first one the best way to go or is there another more efficient and still cheap to make way to do a cooler.