Daikin Altherma Heating Controls using Onecta Integration via Home Assistant

Air Source Heat Pumps (ASHPs)

Last Post by phil bell 4 weeks ago

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phil bell

(@phil-bell)

Active Member Member

Joined: 9 months ago

Posts: 2

Topic starter 11/11/2025 11:12 am

Ok so likely not setting the world on fire here for revolutionary controls but it may help some, especially here in the UK, where Octopus are installing a lot of these Dainkin units.

so they have 2 modes, LWT which runs and balances temps of a heat curve and ignores internal temps. It’s very efficient but doesn’t balance internal comfort without a lot of tinkering.
Then Madoka mode that uses the internal thermostat and constantly messes about with the heat pump, is not great at efficiency but does do comfort well.

So, behold. LWT with some internal reference for the best of both.

\
alias: Heat Pump - Adjust Heat Curve Offset based on Room Temp
triggers:

minutes: /30
trigger: time_pattern
conditions:
condition: numeric_state
entity_id: sensor.altherma_heat_pump_climatecontrol_room_temperature
above: 0
actions:
variables:
room_temp: >
{{ states(‘sensor.altherma_heat_pump_climatecontrol_room_temperature’) |
float(21) }}
current_counter: |
{{ states(‘input_number.heat_curve_offset_counter’) | float(0) }}
choose:
- conditions:
  - condition: numeric_state
    entity_id: sensor.altherma_heat_pump_climatecontrol_room_temperature
    above: 21.5
  - condition: numeric_state
    entity_id: sensor.altherma_heat_pump_climatecontrol_leaving_water_temperature
    above: 30
    sequence:
  - variables:
    new_value: |
    {% set next = current_counter - 1 %} {% if next < -5 %}
    -5
    {% else %}
    {{ next | int }}
    {% endif %}
  - target:
    entity_id: input_number.heat_curve_offset_counter
    data:
    value: “{{ new_value }}”
    action: input_number.set_value
- conditions:
  - condition: numeric_state
    entity_id: sensor.altherma_heat_pump_climatecontrol_room_temperature
    below: 20.5
    sequence:
  - variables:
    new_value: |
    {% set next = current_counter + 1 %} {% if next > 5 %}
    5
    {% else %}
    {{ next | int }}
    {% endif %}
  - target:
    entity_id: input_number.heat_curve_offset_counter
    data:
    value: “{{ new_value }}”
    action: input_number.set_value
- conditions:
  - condition: numeric_state
    entity_id: sensor.altherma_heat_pump_climatecontrol_room_temperature
    above: 20.5
  - condition: numeric_state
    entity_id: sensor.altherma_heat_pump_climatecontrol_room_temperature
    below: 21.5
    sequence:
  - target:
    entity_id: input_number.heat_curve_offset_counter
    data:
    value: 0
    action: input_number.set_value
target:
entity_id: climate.heating_leaving_water_offset
data:
temperature: “{{ states(‘input_number.heat_curve_offset_counter’) | int }}”
action: climate.set_temperature
mode: single
\\

This automation will reference the internal thermostat every 30 minutes and then tweak the flow temperature by 1 up or down to help keep the room temp within the ideal mark of 20.5 and 21.5 degrees C.
Its max adjustment is +/- 5 to the flow temperature.

It also needs a helper to track that adjustment value which you can drop into your configuration.yaml

\
input_number:
heat_curve_offset_counter:
name: Heat Curve Offset Counter
min: -5
max: 5
step: 1
mode: box
initial: 0
\\

This has been keeping my house warm now for a good few weeks and stopping the house over heating whilst keeping the heat pump running slow and steady. Give it a look if you’re interested.

🫶

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