Thermostat target humidity changed

The Thermostat target humidity changed trigger fires after the target humidity (setpoint) of a thermostat entityAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more] changes. The target humidity is what you want the thermostat to maintain, not the current room humidity. Some thermostats support humidity control and allow you to set a target humidity level in addition to temperature. Use this trigger when you want to react to adjustments in the desired humidity, whether they’re made through the UI, an automationAutomations in Home Assistant allow you to automatically respond to things that happen in and around your home. [Learn more], a voice command, or directly on the device.

Use the threshold type to filter which changes matter to your automation. You can fire on any change, or only when the new setpoint is above, below, inside, or outside a specific range.

Using this trigger from the user interface

If you prefer building automations visually, Home Assistant walks you through this trigger step by step. You pick what to watch, tweak a few options, and save. No YAML knowledge required.

To use Thermostat target humidity changed in an automation:

1. Go to Settings > Automations & scenes.
2. Open an existing automation, or select Create automation > Create new automation.
3. In the When section, select Add trigger.
4. Select what you want to monitor. Under By target (see Targets), pick the area your thermostat is in (like your bedroom or living room). You can also select a device, a specific entity, or a label.
5. From the triggers shown for that target, select Thermostat target humidity changed.
6. Under Threshold type, configure what kind of change fires the trigger:
   • Select Any change to fire on any change, regardless of direction or new value.
   • Select Above or Below and enter a value (in %) to fire only when the new setpoint is above or below that value.
   • Select In range and enter a lower and upper bound to fire only when the new setpoint falls inside the range.
   • Select Outside range and enter a lower and upper bound to fire only when the new setpoint is outside the range.
   • For each option, you can enter a fixed percentage or pick a sensor entity or a number helper entity as the threshold.
     • If you don’t have a number helper, you can create one by selecting Create a new number helper.
7. Select Save.

Options in the UI

Using this trigger in YAML

If you work directly in YAML, or you want to know exactly what Home Assistant does under the hood, this section has the technical reference. It lists the field names you use in YAML, their types, and which ones are required.

In YAML, Thermostat target humidity changed is referred to as climate.target_humidity_changed. A basic example looks like this:

trigger: climate.target_humidity_changed
target:
  entity_id: climate.bedroom
options:
  threshold:
    type: above
    value:
      number: 50

This fires whenever the target humidity of climate.bedroom changes to a value above 50%. To fire on any change regardless of direction or value, use type: any and omit value.

To fire only when the new setpoint is within a comfortable range:

trigger: climate.target_humidity_changed
target:
  entity_id: climate.bedroom
options:
  threshold:
    type: between
    value_min:
      number: 40
    value_max:
      number: 60

Options in YAML

YAML sometimes provides additional options for more complex use cases that are not available through the UI.

threshold:
  type: outside
  value_min:
    entity: input_number.comfortable_humidity_min
  value_max:
    number: 60

Targets of the trigger

This trigger requires a target. The target is the object that Home Assistant will watch. You can select a single entityAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more], a device, an area, a floor, or a label as a target, and Home Assistant will watch every matching climate entity behind that target.

• Entity: one specific climate entity, such as climate.living_room.
• Device: every climate entity that belongs to a device.
• Area: every climate entity in a room or area.
• Floor: every climate entity on a floor.
• Label: every climate entity that shares a label.

You can also select different target types in one trigger. For example, you can add a specific entity and an area as targets in the same trigger to monitor both of them at once.

Good to know

• This trigger monitors the target humidity setpoint (what you want the thermostat to maintain), not the current room humidity (the actual measured humidity). To react to changes in measured room humidity, use Relative humidity changed instead.
• The threshold type controls both the direction and the landing zone of the change. Use Above or Below to filter by direction, In range to fire only when the new value is inside a range, and Outside range to fire only when it escapes a range.
• Use Any change to fire on every change regardless of direction or where the new value lands.
• To react only when the target humidity first crosses a specific level, use Thermostat target humidity crossed threshold instead.
• The trigger only works with climate entities that expose a target humidity attribute. Not all thermostats support humidity control.
• Humidity values are expressed as percentages (0-100%).

Try it yourself

Ready to test this? Go to Settings > Automations & scenes, create a new automation, and add this trigger. Save the automation, then change the state of the targeted entity to watch the trigger fire on your actual entitiesAn entity represents a sensor, actor, or function in Home Assistant. Entities are used to monitor physical properties or to control other entities. An entity is usually part of a device or a service. [Learn more].

More examples

Real scenarios where this trigger fires in automations and scripts. Copy any example and adapt it to your setup.

Automation: adjust humidifiers when first thermostat humidity setpoint changes

When the first thermostat in the bedroom area changes its target humidity to a value above 50%, turn on all standalone humidifiers to supplement the climate systems. Firing on the first change prevents multiple humidifier activations.

• Trigger: Thermostat target humidity changed
  • Target: Bedroom area
  • Threshold type: Above (50%)
  • Trigger when: First
• Action: Turn on humidifier

alias: "Turn on humidifiers for high humidity targets"
triggers:
  - trigger: climate.target_humidity_changed
    target:
      area_id: bedroom
    options:
      threshold:
        type: above
        value:
          number: 50
      behavior: first
actions:
  - action: humidifier.turn_on
    target:
      entity_id: humidifier.bedroom

Still stuck?

The Home Assistant community is quick to help: join Discord for real-time chat, post on the community forum with the trigger you’re using and what you expected to happen, or share on our subreddit /r/homeassistant.

Related triggers

These triggers work well alongside this one:

• Thermostat target humidity crossed threshold: Triggers after the humidity setpoint of one or more thermostats crosses a threshold.

• Thermostat target temperature changed: Triggers after the temperature setpoint of one or more thermostats changes.