Last spring, the project won the pair the Consumer Electronics Association's Greener Gadget contest and coverage on CNN. Now it's available as a kit for sale at their Web site. It's open-source, so you can see all the code, parts and methods they used to build it, and modify it as you like to expand its functionality. The kit involves some soldering and programming but comes with crystal-clear step-by-step directions. After enough updates, your followers are bound to start telling you to shut off your air conditioner more often — if you haven't already decided to do it on your own.