text: """Support for Aqualink Thermostats."""
  import logging
  from typing import List, Optional
  
  from iaqualink import AqualinkHeater, AqualinkPump, AqualinkSensor, AqualinkState
  from iaqualink.const import (
      AQUALINK_TEMP_CELSIUS_HIGH,
      AQUALINK_TEMP_CELSIUS_LOW,
      AQUALINK_TEMP_FAHRENHEIT_HIGH,
      AQUALINK_TEMP_FAHRENHEIT_LOW,
  )
  
  from homeassistant.components.climate import ClimateEntity
  from homeassistant.components.climate.const import (
      DOMAIN,
      HVAC_MODE_HEAT,
      HVAC_MODE_OFF,
      SUPPORT_TARGET_TEMPERATURE,
  )
  from homeassistant.config_entries import ConfigEntry
  from homeassistant.const import ATTR_TEMPERATURE, TEMP_CELSIUS, TEMP_FAHRENHEIT
  from homeassistant.helpers.typing import HomeAssistantType
  
  from . import AqualinkEntity, refresh_system
  from .const import CLIMATE_SUPPORTED_MODES, DOMAIN as AQUALINK_DOMAIN
  
  _LOGGER = logging.getLogger(__name__)
  
  PARALLEL_UPDATES = 0
  
  
  async def async_setup_entry(
      hass: HomeAssistantType, config_entry: ConfigEntry, async_add_entities
  ) -> None:
      """Set up discovered switches."""
      devs = []
      for dev in hass.data[AQUALINK_DOMAIN][DOMAIN]:
          devs.append(HassAqualinkThermostat(dev))
      async_add_entities(devs, True)
  
  
  class HassAqualinkThermostat(AqualinkEntity, ClimateEntity):
      """Representation of a thermostat."""
  
      @property
      def name(self) -> str:
          """Return the name of the thermostat."""
          return self.dev.label.split(" ")[0]
  
      @property
      def supported_features(self) -> int:
          """Return the list of supported features."""
          return SUPPORT_TARGET_TEMPERATURE
  
      @property
      def hvac_modes(self) -> List[str]:
          """Return the list of supported HVAC modes."""
          return CLIMATE_SUPPORTED_MODES
  
      @property
      def pump(self) -> AqualinkPump:
          """Return the pump device for the current thermostat."""
          pump = f"{self.name.lower()}_pump"
          return self.dev.system.devices[pump]
  
      @property
      def hvac_mode(self) -> str:
          """Return the current HVAC mode."""
          state = AqualinkState(self.heater.state)
          if state == AqualinkState.ON:
              return HVAC_MODE_HEAT
          return HVAC_MODE_OFF
  
      @refresh_system
      async def async_set_hvac_mode(self, hvac_mode: str) -> None:
          """Turn the underlying heater switch on or off."""
          if hvac_mode == HVAC_MODE_HEAT:
              await self.heater.turn_on()
          elif hvac_mode == HVAC_MODE_OFF:
              await self.heater.turn_off()
          else:
              _LOGGER.warning("Unknown operation mode: %s", hvac_mode)
  
      @property
      def temperature_unit(self) -> str:
          """Return the unit of measurement."""
          if self.dev.system.temp_unit == "F":
              return TEMP_FAHRENHEIT
          return TEMP_CELSIUS
  
      @property
      def min_temp(self) -> int:
          """Return the minimum temperature supported by the thermostat."""
          if self.temperature_unit == TEMP_FAHRENHEIT:
              return AQUALINK_TEMP_FAHRENHEIT_LOW
          return AQUALINK_TEMP_CELSIUS_LOW
  
      @property
      def max_temp(self) -> int:
          """Return the minimum temperature supported by the thermostat."""
          if self.temperature_unit == TEMP_FAHRENHEIT:
              return AQUALINK_TEMP_FAHRENHEIT_HIGH
          return AQUALINK_TEMP_CELSIUS_HIGH
  
      @property
      def target_temperature(self) -> float:
          """Return the current target temperature."""
          return float(self.dev.state)
  
      @refresh_system
      async def async_set_temperature(self, **kwargs) -> None:
          """Set new target temperature."""
          await self.dev.set_temperature(int(kwargs[ATTR_TEMPERATURE]))
  
      @property
      def sensor(self) -> AqualinkSensor:
          """Return the sensor device for the current thermostat."""
          sensor = f"{self.name.lower()}_temp"
          return self.dev.system.devices[sensor]
  
      @property
      def current_temperature(self) -> Optional[float]:
          """Return the current temperature."""
          if self.sensor.state != "":
              return float(self.sensor.state)
          return None
  
      @property
      def heater(self) -> AqualinkHeater:
          """Return the heater device for the current thermostat."""
          heater = f"{self.name.lower()}_heater"
          return self.dev.system.devices[heater]
  