I currently have 1 3 Ton and 1 5 Ton Water Furnace Envision heat pump for my house. They both have 4 zone intellizone zone controllers. On the 3 ton unit I want to go from 4 to 6 zones. Can anyone recommend a zone controller that will work well for this. Ideally I also would like to use the Crestron wired TSTAT thermostats for integration with my crestron system.