Good chance Google fixed this since we got our thermostat, but it has tried to kill our dogs twice. Tech tried to claim a bad C wire and to remove it. As an engineer, it's pretty easy to measure the voltage of the Rh to C wire and see that it's 27VAC as it should be. Thermostat heats while it is supposed to cool, and no logic was programmed in for the thermostat to realize it is malfunctioning, so it heats the house to 95+while you're away. Wiring is confirmed perfect by their own techs. Junk