Nest T4000ES Thermostat E White

This thermostat was super easy to install and set up. I wired it, popped it on the mount, entered my information, let it update, left it on automatic "learn" schedule and just let it rock. My house doesn't have any returns for the forced air system upstairs, so the upstairs gets very hot in the winter at night and the heat runs a lot. The remote temperature sensor (which comes with this kit) solved this problem very well. I have it set to work off the upstairs temperature sensor during the "night" schedule which by default is 10pm to 7am, which ended up being perfect for us. It makes the upstairs so much more comfortable at night and the heat runs a lot less. Just a quick catch-up when it switches back to the downstairs thermostat in the morning. Adding the remote temperature sensor in the settings is also a breeze, especially with the Nest app. And overall, it seems like this thermostat works more "smoothly" than the cheap battery-powered one we had before. The heat doesn't seem to run as long and create as many uncomfortably high temperature events as the old thermostat. The occupancy sensor and automatic "away" eco temperature settings also work very well. It almost immediately recognizes when nobody is home and switches the settings. We also have central air, so I may post an update on how well it works with that when summer comes. Note about installation: This thermostat is powered by the furnace, therefore requires the blue "common" wire to charge the thermostat battery. I thought I was missing the blue wire but it turned out the previous installer just cut it back at the cable sheath. I simply slid a little more slack through in the basement, re-stripped the cable, and got the blue wire back. Note I also precharged the thermostat with the USB micro port while I was working on fixing the wiring. Not sure if that was necessary, but it was completely off/dead when I received it.