Oh I’m definitely replacing Crestron and going for something user serviceable. I have a software engineering background but little knowledge of hardware interfaces.
There are temp sensors throughout the home. I’m not sure how to determine whether it is BACNET or what. Ecobee or Rachio more likely (based on what I know) seems like a good choice for irrigation.
I’m stumped on how to upgrade the HVAC control tho, and how to connect it with the old signal wires. I would hire someone to do that part if I knew what to look for. But most will want to charge a fortune for a full integration I think.