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My home came with an aprilaire 6000 series zone control system - the 2 zone version. As far as I can tell it is most similar to the 6015 system, but it is labeled 6100 - probably a builder bundle version and not retail. The main tstat/controller is a 6003 model, supporting wireless. I see an option for 'Home Automation' in this menu: INSTALLER TOOLS AND TEST MENU Connection Type: Select whether the control will connect to the Aprilaire App (default) or to an home automation system. Aprilaire support has told me this thermostat/unit can be connected to C4, but did not provide any assistance on how. Has anyone successfully connected this type of Aprilaire unit to C4 before? If not, what would other good options be for C4 integration? Thanks