Google called it quits on a smart thermostat two years ago, but it looks like the company couldnt resist circling back to the idea. According to two of The Informations sources and a document reviewed by the outlet, Mountain View has been conducting a trial of Internet-connected thermostats to help users keep tabs on their energy use and adjust accordingly. As part of a project reportedly dubbed EnergySense, the hardware itself seems to be created by a third party such as Ecobee.