"If your smart thermostat goes wrong, you could end up roasting or freezing."
That is exactly what happened to many Nest central heating systems last winter. Apparently it took several weeks for a firmware update to be issued to fix everyone.
http://www.nytimes.com/2016/01/14/fashion/nest-thermostat-glitch-battery-dies-software-freeze.html?_r=0
Biting the hand that feeds IT
