Many elements of the home can be controlled remotely from the residents’ smart phones, including internal temperatures. The GPS on their phones will activate heating systems 20 minutes in advance of their arrival to optimize energy consumption. A similar system is employed for the showers; a water recirculation pump fills the pipes with hot water five minutes before a scheduled shower time.  Photo 6 of 7 in Plugged-In Prefab Collects Weather Data to Conserve Energy