Right - this is a very important point. If you're paying a lot for a thermostat, something is wrong. If you want this to be a smart device (as with many IoT fun

Right - this is a very important point. If you're paying a lot for a thermostat, something is wrong. If you want this to be a smart device (as with many IoT functions), you're better off with an anduino and re-implementing thermostat function with a new array of sensors and software. an Arduino and a $15 PID will give you a better result anyway, and you'll also get to have the luxury of better sensor distribution, since you can instrument all of that stuff yourself. The major problem I have with IoT stuff, is that outside of the initial telemetry/sensor/data gathering phase, many of these devices won't change...The idea of a smart thermostat is not really special, nor is the app. Where the IoT would be best is in making it easy to diagnose heat loss in the system/air delivery inconsistency, and then provide a way to make physical changes to the system to improve things. Barring a way to act on the data, its useless. Its also useless to continually collect data over time, since the system has already been optimized. (unless you're expecting your instrumentation to either measure degradation of performance over time, or you can incorporate the instruments into a closed-loop system where they validate that the output remains constant).