Put another way, residential heating and air conditioning constitute 11.88 percent of the U.S. energy budget: cars only account for 8.9 percent. (see spread sheets 2.2 and 2.6) Worse, a good portion of that energy is wasted: lights get left on, air conditioners churn when you are on vacation, sleeping notebooks suck vampire power.
FORBES: Nest Labs: Can Apple Alums Make A Thermostat Hip?