former apple executive who helped develop the ipod. it's easy to control and controls 50% of the home's energy use. advanced features like this help people save money. >> the leaf saves relative to what you, if you like 27 degrees at cooling season, it will show up 73 to nudge you slightly out of your comfort zone. >> reporter: he says even a degree or two of energy conservation can add up to a whole lot of savings at the end of the month. the price tag is about $250. first batch of therm statsd sold out in a matter of few weeks. a sign heather that the humble home thermostat is hot gadget and cool way to save some money. >> heather: and eventually it could read your mind. thank you very much, claudia. >> gregg: i got a couple digital