this post was submitted on 05 Aug 2023
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A lot of the time you're still utilising those proprietary products though. I'm not aware of a home thermostat that isn't both easy to use (for the family) and non-proprietry. Sure home assistant can act as a coordinator, but in a lot of the cases it's doing it via the cloud service.
Most modern boilers can be activated by a simple relay (it's how the thermostat calls for heat).
A basic switch plumbed into hass can be set up as a thermostat entity, that isn't too horrible to use.
And you can add a physical thermostat capable of sending values locally to hass if people want to be able to spin a dial on the wall.
To be honest, I do a lot of my automation invisibly: The target temperature is automated, the only physical button is a "30 minutes heat" one I installed.
There are some nice ZigBee trvs now
I largely use Xiaomi and you can flash the temperature and humidity monitors.
It'd not an off-the shelf solution as such, but I have a relay with an ESP32 that fires up the heating and it's directly controlled by HA. HA uses thermometers around the house - mostly ZigBee - to work out when to run it.
Given that Hive is ZigBee based and will continue to work locally, I wonder if it can be directly linked to HA?
There are options for cloud free thermostats. The Drayton Wiser system can be controlled fully locally via a custom Home Assistant integration.
There are also some Zigbee and Z-wave thermostats that run locally.