From 0308f01b295a8ecfef9938b67514aa1b7b95e5bc Mon Sep 17 00:00:00 2001
From: Maciej Bieniek <bieniu@users.noreply.github.com>
Date: Sun, 16 Aug 2026 09:14:02 +0200
Subject: [PATCH] Add support for inverted output in Shelly climate entity
 (#179208)

---
 homeassistant/components/shelly/climate.py |  6 +++-
 tests/components/shelly/test_climate.py    | 35 ++++++++++++++++++++++
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/homeassistant/components/shelly/climate.py b/homeassistant/components/shelly/climate.py
index 422618df9179..c8cfc68f517c 100644
--- a/homeassistant/components/shelly/climate.py
+++ b/homeassistant/components/shelly/climate.py
@@ -727,6 +727,9 @@ class RpcClimate(ShellyRpcEntity, ClimateEntity):
         self._thermostat_type = coordinator.device.config[self.key].get(
             "type", "heating"
         )
+        self._invert_output = coordinator.device.config[self.key].get(
+            "invert_output", False
+        )
         if self._thermostat_type == "cooling":
             self._attr_hvac_modes = [HVACMode.OFF, HVACMode.COOL]
         else:
@@ -770,7 +773,8 @@ class RpcClimate(ShellyRpcEntity, ClimateEntity):
     @override
     def hvac_action(self) -> HVACAction:
         """HVAC current action."""
-        if not self.status["output"]:
+        # When inverted, relay on means idle; otherwise relay on means active.
+        if self.status["output"] == self._invert_output:
             return HVACAction.IDLE
 
         return (
diff --git a/tests/components/shelly/test_climate.py b/tests/components/shelly/test_climate.py
index 03abc95d1680..e249324a895d 100644
--- a/tests/components/shelly/test_climate.py
+++ b/tests/components/shelly/test_climate.py
@@ -736,6 +736,41 @@ async def test_rpc_climate_hvac_mode_cool(
     assert state.attributes[ATTR_HVAC_ACTION] == HVACAction.COOLING
 
 
+@pytest.mark.parametrize(
+    ("thermostat_type", "invert_output", "output", "expected_action"),
+    [
+        ("heating", False, True, HVACAction.HEATING),
+        ("heating", False, False, HVACAction.IDLE),
+        ("heating", True, True, HVACAction.IDLE),
+        ("heating", True, False, HVACAction.HEATING),
+        ("cooling", True, True, HVACAction.IDLE),
+        ("cooling", True, False, HVACAction.COOLING),
+    ],
+)
+async def test_rpc_climate_hvac_action_inverted_output(
+    hass: HomeAssistant,
+    mock_rpc_device: Mock,
+    monkeypatch: pytest.MonkeyPatch,
+    thermostat_type: str,
+    invert_output: bool,
+    output: bool,
+    expected_action: HVACAction,
+) -> None:
+    """Test climate hvac action with inverted output."""
+    entity_id = "climate.test_name"
+
+    new_config = deepcopy(mock_rpc_device.config)
+    new_config["thermostat:0"]["type"] = thermostat_type
+    new_config["thermostat:0"]["invert_output"] = invert_output
+    monkeypatch.setattr(mock_rpc_device, "config", new_config)
+    monkeypatch.setitem(mock_rpc_device.status["thermostat:0"], "output", output)
+
+    await init_integration(hass, 2, model=MODEL_WALL_DISPLAY)
+
+    assert (state := hass.states.get(entity_id))
+    assert state.attributes[ATTR_HVAC_ACTION] == expected_action
+
+
 async def test_wall_display_thermostat_mode(
     hass: HomeAssistant,
     mock_rpc_device: Mock,