The Daikin AC integration in Home Assistant is getting a new action, daikin.set_demand_control. It limits a unit's maximum power to a percentage of its nominal power, for example while electricity is expensive. The change by Fredrik Erlandsson was merged on 14 October 2026, and the documentation, merged a day later, marks it as available from Home Assistant 2026.11.

How it works

This is an action for automations and scripts, not a new slider on the dashboard. In the editor it appears as "Set demand control" under the Daikin AC integration, with four options:

  • Device: the Daikin unit to limit;
  • Enable: turns demand control on or off;
  • Maximum power: 40 to 100 percent of nominal power, 100 by default, used only with demand control on and the mode set to manual;
  • Mode: "Manual" or "Auto". In auto mode the unit manages the limit itself and the maximum power setting is ignored.

In YAML a basic call looks like this:

action: daikin.set_demand_control
data:
  device_id: 17159993ce512ff1794b6c1abc6f3df3
  en_demand: true
  max_pow: 40

The documentation suggests copying the device ID by building the action in the UI first and then switching it to YAML.

Which units support it

Not every Daikin model has demand control. The integration checks the dmnd capability flag the unit already reports in its model information, so setup sends no extra request. On a model without the feature the action fails with an error instead of doing nothing quietly. The feature comes from pydaikin 2.19.0, the library behind the integration.

If several indoor units share one outdoor unit, the documentation notes that the outdoor unit follows the least restrictive setting. With one indoor unit at 80 percent and another at 50 percent, the outdoor unit will run at up to 80 percent. Limiting just one room does not cut the whole system's draw.

A typical use

The documentation includes an example built around a binary sensor that turns on during the high tariff. When it switches on, the automation enables demand control at 40 percent, and when it switches off, it turns the limit off again. A second example caps the unit at 60 percent between sunset and sunrise. Any integration that knows the electricity price or tariff periods can drive the same logic, so the air conditioner keeps running at peak hours, just with less power.