How about a pre built smart thermostat system ? We can build the Niagara front end JACE and supply all the communicating thermostats.  

We offer Pre Built and commissioned Niagara controllers and JACE's. If you have a need for a controller or control system contact us about you needs. We can prebuild and commission the controllers and ship them out with control drawings. We can do in between as needed let us give you a quote.