Thermostat is drying

The Thermostat is drying condition passes when 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] is actively in dry mode, removing excess humidity from the air. This is common in air conditioning systems with dehumidification capabilities. A thermostat set to dry mode does not run continuously. It cycles to maintain comfortable humidity levels. Use Thermostat is drying to confirm the system is in an active drying cycle, rather than just set to dry mode and idle.

Using this condition from the user interface

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

To use Thermostat is drying in an automation:

1. Go to Settings > Automations & scenes.
2. Open an existing automation, or select Create automation > Create new automation.
3. In the And if section, select Add condition.
4. Select what you want to check. Under By target (see Targets), pick the area your thermostat is in (like your living room or bedroom). You can also select a device, a specific entity, or a label.
5. From the conditions shown for that target, select Thermostat is drying.
6. Under Condition passes if (see Behavior), pick Any or All to control how the check behaves when multiple thermostats are targeted.
7. Under For at least, set how long the thermostat must have been actively drying before the condition passes. Leave it at zero to pass immediately.
8. Select Save.

Options in the UI

Using this condition 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 is drying is referred to as climate.is_drying. A basic example looks like this:

condition: climate.is_drying
target:
  entity_id: climate.living_room

This passes when the living room thermostat is actively running in dry mode to remove excess humidity.

Options in YAML

Targets of the condition

This condition requires a target. The target is the object that Home Assistant will check. You can point the condition at 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, and Home Assistant will evaluate 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 condition. For example, you can add a specific entity and an area as targets in the same condition to check both of them at once.

Behavior with multiple targets

When you target more than one entity (or select an area, floor, or label that contains several), the Condition passes if option controls how the results combine:

• Any (default): the condition passes if at least one of the targeted entities matches. For example, if you check three smoke sensors and only one of them detects smoke, the condition still passes. This is useful for questions like “is there smoke anywhere in the house?”
• All: the condition passes only when every targeted entity matches. For example, if you check the same three smoke sensors, the condition passes only once all three report cleared. This is useful for “is the entire house safe now?” checks, so your automation does not send an all-clear while one room still has a reading.

Good to know

• A thermostat can be set to dry mode but not actively drying if it has already reached comfortable humidity levels and is idling. Use Thermostat is in HVAC mode if you only care about the mode setting.
• Thermostats that are unavailable (unavailable) or have an unknown state (unknown) do not count as actively drying. With Any behavior, they are skipped. With All behavior, the condition fails if every targeted thermostat is unavailable.
• This condition checks the current action of the thermostat, not its mode. To check if a thermostat is simply on (any active mode) or off, use Thermostat is on or Thermostat is off.
• Dry mode is typically found in air conditioning systems with dehumidification features. Not all climate systems support this mode.

Try it yourself

Ready to test this? Go to Settings > Automations & scenes, open an automation, and add this condition. Trigger the automation with and without the condition met, and watch whether it continues or stops.

More examples

Real scenarios where this condition gates an automation. Copy any example and adapt it to your setup.

Automation: boost air circulation when dehumidifying

When the living room thermostat is actively drying the air, increase the ceiling fan speed to improve air circulation and help distribute the dehumidified air throughout the room. This optimizes moisture removal only during active drying cycles.

• Trigger: State: Living room thermostat started drying
• Condition: Thermostat is drying
  • Target: Living room thermostat
• Action: Set fan speed to 60%

alias: "Boost fan when drying"
triggers:
  - trigger: state
    entity_id: climate.living_room
    attribute: hvac_action
    to: "drying"
conditions:
  - condition: climate.is_drying
    target:
      entity_id: climate.living_room
actions:
  - action: fan.set_percentage
    target:
      entity_id: fan.living_room_ceiling
    data:
      percentage: 60

Still stuck?

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

Related conditions

These conditions work well alongside this one:

• Thermostat is on: Tests if one or more thermostats are on.

• Thermostat is cooling: Tests if one or more thermostats are cooling.

• Thermostat is heating: Tests if one or more thermostats are heating.

• Thermostat is in HVAC mode: Tests if one or more thermostats are set to a specific HVAC mode.