Update modbus climate (#62483)

Single register values weren't parsed accordingly for climate devices.
Co-authored-by: jan Iversen <jancasacondor@gmail.com>

homeassistant/components/modbus/climate.py

@@ -28,6 +28,7 @@ from . import get_hub
 from .base_platform import BaseStructPlatform
 from .const import (
     CALL_TYPE_REGISTER_HOLDING,
+    CALL_TYPE_WRITE_REGISTER,
     CALL_TYPE_WRITE_REGISTERS,
     CONF_CLIMATES,
     CONF_MAX_TEMP,
@@ -122,12 +123,21 @@ class ModbusThermostat(BaseStructPlatform, RestoreEntity, ClimateEntity):
             for i in range(0, len(as_bytes), 2)
         ]
         registers = self._swap_registers(raw_regs)
+
+        if isinstance(registers, list):
             result = await self._hub.async_pymodbus_call(
                 self._slave,
                 self._target_temperature_register,
-            registers,
+                [int(float(i)) for i in registers],
                 CALL_TYPE_WRITE_REGISTERS,
             )
+        else:
+            result = await self._hub.async_pymodbus_call(
+                self._slave,
+                self._target_temperature_register,
+                target_temperature,
+                CALL_TYPE_WRITE_REGISTER,
+            )
         self._attr_available = result is not None
         await self.async_update()