[Feature request] - Update Temperature Offset in self-regulation

[jmcollin78]

Discussed in #342

The point is:

add a way to update the offset for a list of underlying which are able to change the offset temperature and find a way to have a generic solution (not depending of a particular device brand or model).

---

^{Originally posted by LennardPlay January 15, 2024}
Most TRVs / room theremostats publish both a CLIMATE:set_temperature and a CLIMATE:temperature_offset entity.
That opens up two possible methods for dynamic temperature regulation.

Dynamically adjusting the CLIMATE:set_temperature within a few degrees around the VT.set_temperure, to reach the desired temperature more quickly and more reliably (like VT does right now)

• Easy to understand
• Doesn't require a temperature_offset temperature
• Easy to troubleshoot in the HA history tab

Keeping the CLIMATE:set_temperature the same as the VT:set_temperature and doing the dynamic regulation through the CLIMATE:temperature_offset (Telling the climate device, that the room is colder than it thinks)

• Keeping the VT's and climate's set point the same (more elegant)
• No more confusion for family members or guests ("Why does the thermostat say 22°C when I just set it to 20°C?")
• Easily adjust the set temperature on the climate device itself without needing to go into manual mode. Temperature set points always are fully synchronized
• It needs to be tested how other climate devices react to frequent changes in CLIMATE:temperature_offset

Basically the 2 methods do the same thing. The only difference is where the addition of the regulation_offset + set_temperature takes place (in software vs in the climate device)

An Example

Mothod 1: (How VT works right now)
VT:current_temp: 15°C
VT:set_temperature: 20°C
-> CLIMATE:set temperature: 21.5°C
-> Climate heats to 21.5°C internal temperature -> Room reaches the right temperature more quickly

Mothod 2:
VT:current_temp: 15°C
VT:set_temperature: 20°C
-> CLIMATE:set temperature: 20°C
-> CLIMATE:temperature_offset: -1.5°C
-> Climate heats to 21.5°C internal temperature -> Room reaches the right temperature more quickly

I think method 2 could bring an improvement to the VT integration and make it more useful. Let me know what you think of this idea :)

[bell07]

Some additional remarks to the idea.

They are two offset entity types, that cannot be differentiated by automatically. In first step only one of them should be supported or both?

Type 1. internal sensor offset
This type adjust the sensor values. That means, if offset is set, the internal thermostat temperature changes in dashboard and on hardware display. Values <0 means, the room is colder and heating should be increased. Value > 0 means the room is warmer. Since this offset changes (delayed) the internal temperature value, this needs to be covered in next calculation.

Example 2 extended:
VT:current_temp: 15°C
VT:set_temperature: 20°C
-> CLIMATE:set temperature: 20°C
-> CLIMATE:temperature_offset: -1.5°C
-> Climate heats to 21.5°C internal temperature -> Room reaches the right temperature more quickly
-> Climate show still target temperature 20°C on display, that is less confusing
-> Climate show internal temperature is 13,5 °C

Type 2. heating power offset
This type just change the heating power. That means if offset is set, no changes are displayed in UI, but the hating is more powered. Values >0 means, the room is colder and heating should be increased. Value <0 means the room is warmer. Since this offset changes (delayed) the internal temperature value, this needs to be covered in next calculation.

Example 2 extended:
VT:current_temp: 15°C
VT:set_temperature: 20°C
-> CLIMATE:set temperature: 20°C
-> CLIMATE:temperature_offset: 1.5°C
-> Climate heats to 21.5°C internal temperature -> Room reaches the right temperature more quickly
-> Climate show still target temperature 20°C on display, that is less confusing
-> Climate show internal temperature is 15 °C

I have more "Type 1. internal sensor offset" devices and only 2 "Type 2. heating power offset" so the Type 1 is higher prio for me.

[bell07]

VT does have two different offsets: The "self regulation" and the "Use internal temperature of the underlying".

I like to see the offset updates from the "Use internal temperature of the underlying" too. In case of Type 1. internal sensor offset it is possible to show the temperature of external thermometer on device.

How VT works right now :
External thermometer: 18°C
Climate (internal) thermometer: 20°C
Target temperature: 20°C
"Use internal temperature of the underlying" set the target temperature to 22.
-> Device show 22° target and 20° current. Heating is in progress

How VT can work using offset :
External thermometer: 18°C
Climate (internal) thermometer: 20°C
Target temperature: 20°C
"Use internal temperature of the underlying" set the offset to -2
-> Device show 20° target and 18° current. Heating is in progress.