Controlling Air Source Heat Pump LWT Offset

[DrConradInTheHouse]

Interesting, but…not for Air Source Hear Pumps - can something be done for this?

I run a Daikin air source heat pump (ASHP) that runs in LWT mode (i.e. thermostat influence removed). This is because the accompanying Madoka thermostat implements a truly awful hysteresis algorithm coupled with slow response to temp changes, means uncomfortable and erratic home heating.

In LWT mode a Weather Dependent Heating Curve is set by me and used by the system as a reference value for lwt then one can apply a -ve or +ve offset to this, so as to refine control the lwt and thus the general home temp (all emitters are fully balanced and all rooms are roughly at the same temp). I tend to dial in offsets in the range of -4 to +2.

In Homeassistant, we could implement some form of PID drive that adjusts offset based on a input room temperature sensor (I use a Switchbot meter plus). SimpleThermostat / Generic Thermostat etc. don’t cut it because these operate on a ‘heater’ turning it on and off and their hysteresis is very basic. Your integration appears similar.

ASHP are designed to run 24/7 hence cycling them this way is a wear and tear driver. Far better to control the lwt. Hence this post.

Any way this can be implemented?

[ScratMan]

What is the type of the LWT offset instance in Home Assistant ? Is it a number.entity_name input ? And what is the unit °C or °F ?
If it's degrees, IMHO a simple automation to adjust the offset to +1, 0 or -1 depending if ambient temperature is above, equal or below the target temperature should be enough; and switch to -2 to -4 if temperature is over setpoint + an adjustable threshold, same for +2 if temperature is too low Vs setpoint.

[borisvettorato]

I have exactly the same setup, did you manage to use this thermostat for the daikin @DrConradInTheHouse