diff --git a/homeassistant/components/velbus/climate.py b/homeassistant/components/velbus/climate.py
index 34a565c2b37..ed47d8b0a91 100644
--- a/homeassistant/components/velbus/climate.py
+++ b/homeassistant/components/velbus/climate.py
@@ -14,6 +14,7 @@ from homeassistant.components.climate import (
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.const import ATTR_TEMPERATURE, UnitOfTemperature
 from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import ServiceValidationError
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from .const import DOMAIN, PRESET_MODES
@@ -39,8 +40,7 @@ class VelbusClimate(VelbusEntity, ClimateEntity):
         ClimateEntityFeature.TARGET_TEMPERATURE | ClimateEntityFeature.PRESET_MODE
     )
     _attr_temperature_unit = UnitOfTemperature.CELSIUS
-    _attr_hvac_mode = HVACMode.HEAT
-    _attr_hvac_modes = [HVACMode.HEAT]
+    _attr_hvac_modes = [HVACMode.HEAT, HVACMode.COOL]
     _attr_preset_modes = list(PRESET_MODES)
     _enable_turn_on_off_backwards_compatibility = False
 
@@ -66,6 +66,11 @@ class VelbusClimate(VelbusEntity, ClimateEntity):
         """Return the current temperature."""
         return self._channel.get_state()
 
+    @property
+    def hvac_mode(self) -> HVACMode:
+        """Return the current hvac mode based on cool_mode message."""
+        return HVACMode.COOL if self._channel.get_cool_mode() else HVACMode.HEAT
+
     @api_call
     async def async_set_temperature(self, **kwargs: Any) -> None:
         """Set new target temperatures."""
@@ -79,3 +84,15 @@ class VelbusClimate(VelbusEntity, ClimateEntity):
         """Set the new preset mode."""
         await self._channel.set_preset(PRESET_MODES[preset_mode])
         self.async_write_ha_state()
+
+    @api_call
+    async def async_set_hvac_mode(self, hvac_mode: HVACMode) -> None:
+        """Set the new hvac mode."""
+        if hvac_mode not in self._attr_hvac_modes:
+            raise ServiceValidationError(
+                translation_domain=DOMAIN,
+                translation_key="invalid_hvac_mode",
+                translation_placeholders={"hvac_mode": str(hvac_mode)},
+            )
+        await self._channel.set_mode(hvac_mode)
+        self.async_write_ha_state()
diff --git a/homeassistant/components/velbus/strings.json b/homeassistant/components/velbus/strings.json
index 948c079444d..55c7fda84ac 100644
--- a/homeassistant/components/velbus/strings.json
+++ b/homeassistant/components/velbus/strings.json
@@ -17,6 +17,11 @@
       "already_configured": "[%key:common::config_flow::abort::already_configured_device%]"
     }
   },
+  "exceptions": {
+    "invalid_hvac_mode": {
+      "message": "Climate mode {hvac_mode} is not supported."
+    }
+  },
   "services": {
     "sync_clock": {
       "name": "Sync clock",