With a cooling capacity of 3 degrees Celsius for a 12 square meter room, this system can be run for a full 24 hours and cost you as little as $.01. Totally eco-friendly, the Geizeer uses wood, which is a great thermal insulator, and any cool substance such as ice to deliver cool air. With the lid closed, the two points of power come in contact which activates the built-in fan. Forcing warmer air inside, the Geizeer forces the ice cube to shrink and pushes the nice, cold air out of the system so you and your co-workers, roommates, or family members can get some relief from the summer temperatures. Available in natural wood and a white, black, red, blue, or orange exterior, the Geizeer is the ultimate device in your home which you can take from room to room to stay cool.