For six years, a group of robots lived in three houses on a street in Campbell Creek, Tennessee. No humans resided there with them. The house was solely occupied by robots, fake sweat machines, and a bunch of electronic appliances, which turned on every day — right on schedule.
In October, the robots were removed from the three homes. As expected, the most-energy efficient house had an overall utility bill that was four times smaller than that of the control house.
The most interesting thing about this are the fake sweat machines.