I recently got a couple of Stelpro Ki thermostats. They have the ability to display outdoor temperature, but the manual has this somewhat vague description:
Outdoor Temperature (EXT)
When connected to a Z-Wave network, the thermostat may display the outdoor temperature provided by an external sensor.
When available, the outdoor temperature is displayed instead of the set point, providing that the outdoor temperature display setting is set to on.
If no temperature is received within a 4 hours timeframe, the outdoor temperature will disappear and the set point will be displayed.
In order to display the outdoor temperature, an external sensor needs to be part of the Z-Wave network. It may be a physical sensor or a weather station app.
Refer to your Z-Wave hub controller instructions manual to find how to associate both devices. On some Z-Wave hub controllers, an app may be used to provide the outdoor temperature.
The last sentence sounds promising (I don’t intend to get an outdoor temperature sensor), but I don’t really know what I’m looking for. My controller is a Aeotec ZW090 Z-Stick Gen5. Does anyone know if this is doable in Home Assistant / with that controller? Or even what I can search for to find out?
(Side note: it’s nice to have a baseboard heater-compatible smart thermostat, but given that those of us with baseboard heaters tend to have thermostats bloody everywhere, upgrading is not a cheap proposition.)