Fix for #42

Removed dependency on deprecated method (temperature utility), as it will break in april 2023. For now, reverted to not converting any temperatures, as the rest of the code only seems to work with Celsius.

Future development; reintroduce temperature conversion, based on TemperatureConverter (home assistant unit_conversion.py in util folder).

warmup/climate.py

@@ -31,7 +31,9 @@
 from homeassistant.exceptions import InvalidStateError, PlatformNotReady
 import homeassistant.helpers.config_validation as cv
 from homeassistant.util import Throttle
-from homeassistant.util.temperature import convert as convert_temperature
+
+""" temperature utility will stop working in HA 2023.4. Removed it for now, as CELCIUS is the only temperature standard this module supports anyway. """
+# from homeassistant.util.temperature import convert as convert_temperature
 
 DOMAIN = "warmup"
 CONFIG_SCHEMA = vol.Schema(
@@ -313,16 +315,18 @@ def state_attributes(self) -> Dict[str, Any]:
     @property
     def min_temp(self):
         """Return the minimum temperature."""
-        return convert_temperature(
-            self._device.min_temp, TEMP_CELSIUS, self.hass.config.units.temperature_unit
-        )
+        # return convert_temperature(
+        #    self._device.min_temp, TEMP_CELSIUS, self.hass.config.units.temperature_unit
+        # )
+        return self._device.min_temp
 
     @property
     def max_temp(self):
         """Return the maximum temperature."""
-        return convert_temperature(
-            self._device.max_temp, TEMP_CELSIUS, self.hass.config.units.temperature_unit
-        )
+        # return convert_temperature(
+        #     self._device.max_temp, TEMP_CELSIUS, self.hass.config.units.temperature_unit
+        # )
+        return self._device.max_temp
 
     @property
     def supported_features(self):