Additional sensors for dynamic HVAC (Score: 1) by firstname.lastname@example.org on 2015-08-17 15:10 (#HMQZ) Its really sad how expensive a quality HVAC thermostat system is. I found one Honeywell system that would actually maybe kinda do something smart, but it would be in the thousands of dollars price point, and intended for commercial applications. What is needed is:A system of thermostats that all talk to each other and wirelessly control floor vents. So if the room where the thermostat is is not representative of the whole house, additional thermostats can be paired to give the system more data points to consider. With optional computer controlled vents, the system can further be optimized. This was my hope for Nest. But years later, there has been no improvement. there is no algorithm that will solve a problem for which there is only incomplete input data.