Hi all\r\n this may be a little off topic but I'm working on extending my own cbus automation and wanted to improve the overall HVAC control I have. \r\n\r\nI'm working with a 10 year old Hitachi Utopia system (8 on-off zones controlled by manual IAS wall controllers) which could do little more than allow cbus to turn it on or off and detection run state using relays and some cbus logic. Note I did also setup a IR interface but never got enough detail out off the hitachi techs to figure out how to use the PAC or anything else to control it via IR.\r\n\r\nAs one of the wall controllers had failed I started looking into this again had noticed the iZone (airsteam) and myZone3 (metalflex) systems looking for replacement parts with the idea of "upgrading" in mind. \r\n\r\nApparently they "claim" to be "add on" automation control systems that can upgrade older systems and provide an automation interface (rest api) and also control the old on/off zone motors like a VAV system would, making ducted systems much more efficient.\r\n\r\nNote from what I can tell, they both are based on the same hardware but were branched at some point. Myzone3 seems to be more targeted to older equipment as the vendor claims it can control IAS zone motors (as if they were VAV motors using timing information) and also the older Hitachi's by the A/B cable to give full control better than I have with cbus now. No guarantees just claims currently, apparently myzone3's aren't regularly installed in Victoria (my state) but QLD.\r\n\r\nIf I went this way I would rewrite PAC logic and the HVAC control logic using a framework like openhab2.\r\n\r\nThat said, apart from a scrappy manual with very little information I cannot find much on either system and the vendors themselves aren't that very familiar with it technically. An add on system seems to cost somewhere between 1k-3k in parts depending on what you do (e.g full control, temp sensors, or just zone control).\r\n\r\nWondering if anyone has experience with them and could share there thoughts? Stay clear? Better options? Great experience?\r\n\r\nDo I stick with the wall controllers or take a gamble on this. If I gamble with it I'd build an openhab plugin in the process.