diff --git a/homeassistant/components/lightwave/climate.py b/homeassistant/components/lightwave/climate.py
index 942fb4a1fbc0..136486f24926 100644
--- a/homeassistant/components/lightwave/climate.py
+++ b/homeassistant/components/lightwave/climate.py
@@ -90,7 +90,7 @@ class LightwaveTrv(ClimateEntity):
                 self._attr_hvac_action = HVACAction.OFF
 
     @property
-    def target_temperature(self):
+    def target_temperature(self) -> float | None:
         """Target room temperature."""
         if self._inhibit > 0:
             # If we get an update before the new temp has