Conveniently enough, they sell a device to help with that. "In addition, the Nest Protect activity sensors improve the Auto-Away feature of your Nest Thermostat." (Nest Protect is their smoke detector.)
Yes. I'm not a huge fan of the product in general or the financial deal BUT I will say this aspect of the product is genius in that you want an auxiliary sensor aka the smoke detector right where people spend most of their time, bedrooms and offices and such. There are serious problems with the overall situation, but no sarcasm, the specific situation of this product pairing is a work of genius. I don't think that one idea makes up for the other problems, but credit it due them for this.
