But, if the Nest "connected home" products are tied to your Google account, your Nest usage could trigger ads seen in your browsers.
Use the heat a lot? Ads for sweaters, blankets, etc. Use the AC a lot, ads for coolers, beer, fans, etc.
The nest isn't really the best place to show adds. I have had one for a little over a year now and rarely ever even see the screen. It only lights up when I walk directly past it and I don't even bother to look at it most of the time. It has my schedule down to a T now and does a great job of keeping me comfortable without any intervention on my part. When I do want to make adjustments I do it from the app on my iPhone/iPad. It's just a simpler interface to navigate than the click-wheel thermostat. I suppose they could show adds in the app if they wanted but that's about the only place I would see them.