# SystemModeEnum

    enum SystemModeEnum

The current operating mode of the thermostat.
- `


  ### [off](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO3offyA2GmF)


  ` The thermostat is not set to engage any climate control functions.

  #### Declaration

  Swift

      case off

- `


  ### [auto](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO4autoyA2GmF)


  ` Demand is generated for either cooling or heating, as required.

  #### Declaration

  Swift

      case auto

- `


  ### [cool](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO4coolyA2GmF)


  ` Demand is only generated for cooling.

  #### Declaration

  Swift

      case cool

- `


  ### [heat](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO4heatyA2GmF)


  ` Demand is only generated for heating.

  #### Declaration

  Swift

      case heat

- `


  ### [emergencyHeat](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO13emergencyHeatyA2GmF)


  ` Second stage heating is in use to achieve desired temperature.

  #### Declaration

  Swift

      case emergencyHeat

- `


  ### [precooling](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO10precoolingyA2GmF)


  ` The thermostat is in precooling mode.

  #### Declaration

  Swift

      case precooling

- `


  ### [fanOnly](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO7fanOnlyyA2GmF)


  ` Demand is only generated for fan.

  #### Declaration

  Swift

      case fanOnly

- `


  ### [dry](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO3dryyA2GmF)


  ` Demand is only generated for dehumidification.

  #### Declaration

  Swift

      case dry

- `


  ### [sleep](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO5sleepyA2GmF)


  ` The thermostat is set to sleep mode.

  #### Declaration

  Swift

      case sleep

- `


  ### [init(rawValue:)](https://developers.home.google.com/reference/swift/GoogleHomeTypes/Enums/Matter/ThermostatTrait/SystemModeEnum#/s:15GoogleHomeTypes6MatterO15ThermostatTraitV14SystemModeEnumO8rawValueAGSgs6UInt64V_tcfc)


  ` Creates a new instance with the specified raw value.

  If there is no value of the type that corresponds with the specified raw
  value, this initializer returns `nil`. For example:

      enum PaperSize: String {
          case A4, A5, Letter, Legal
      }

      print(PaperSize(rawValue: "Legal"))
      // Prints "Optional(PaperSize.Legal)"

      print(PaperSize(rawValue: "Tabloid"))
      // Prints "nil"

  #### Declaration

  Swift

      init?(rawValue: UInt64)

  #### Parameters

  |---|---|
  | ` rawValue ` | The raw value to use for the new instance. |