Zoned heating system from disparate line-voltage and low-voltage thermostats

[reid.a.baldwin]

@SmartenUp

I want to be able to

• set modes such as home, away, sleeping, vacation, and when those modes are set have each thermostat go to a specified set point
• control all this from a wall mounted traditional appearing thermostat
• also be able to check and control this remotely from my phone
• adjust an individual thermostat to a new temperature and have that setting hold until the next time the whole system's mode changes

Most of what you are asking for is easily accomplished using Hubitat's modes and Rule Machine once you get smart thermostats installed. The exception may be controlling Hubitat's mode from the thermostat. Although some thermostat's have the concept of various modes like home, away, sleeping, etc., that information is not part of what is typically communicated to Hubitat.

@SmartenUp

I'd like to be able to

• trigger away mode when I lock a smart lock on my way out the door
• trigger home mode when I unlock the door via smart lock
• trigger sleep mode from a switch or button next to the bed (eventually hope to have that also turn off all the lights, lock all the doors and arm my alarm)

Most of this should be doable with a smart door lock and smart light. I don't think any of the smart locks distinguish between locking from the outside and locking from the inside. I've heard mixed results distinguishing between manual locking events and Hubitat commanded locking events.

@SmartenUp

Most of the rooms are on high, line-voltage thermostats.

I am not familiar with line voltage system like what you are describing, so I will not comment on that aspect.

@SmartenUp

The main room is on a low voltage thermostat (says 30 volt max on back and just has two tiny wires [red and white] coming from the wall), I am assuming this was done because that room has 4 of these heaters which would have been too much wattage for a single line voltage thermostat, and so this is some kind of relay perhaps.

Based on this description, you should not assume that any smart low voltage thermostat will work as a simple replacement for what you have. Two wires wouldn't usually be sufficient for both power and signal, unless some non-standard protocol is used. Is the thermostat battery powered? Is it an old-fashioned thermostat that doesn't need power? I recommend that you investigate how this is wired and hopefully physically find the relay that you suspect is there. You may end up wanting to run 5-conductor thermostat wire to the thermostat. Alternatively, you may end up deciding to replace that relay with a smart relay like a Zooz ZEN16 and not rely on the wire to transmit the signal. (That option would make your system dependent on your Hubitat for basic function.)