While this is very cool, I'd like to hear more in regards to how multiple Nest thermostats can work together. Ideally there would be one expensive unit and seve

While this is very cool, I'd like to hear more in regards to how multiple Nest thermostats can work together. Ideally there would be one expensive unit and several other attachable units, much like how you can extend Wifi range. The carbon monoxide detector would make for a great addon unit, a "plugin" of the master smoke detector unit.