The nest cost $250, insulation cost 10x that, and new furnace is 40x. I agree that insulation and upgrading the home would produce the nest results but my poin

The nest cost $250, insulation cost 10x that, and new furnace is 40x. I agree that insulation and upgrading the home would produce the nest results but my point is that the data is useful, not useless. I could shut my heating completely and save 100% but that misses the point. What I did was turn on the heating in the morning to a temperature that was comfortable and then shut it off so that by the time everyone left for work/school the temperature would still be acceptable but on the lower bounds. That saved about 45 mins of heating a day. Overnight as well I could see how my furnace behaved and tweaked based on that, etc. The key isn't just the nest but the other temp sensors so I have a complete idea of what my houses characteristics are.