diff --git a/homeassistant/components/atag/climate.py b/homeassistant/components/atag/climate.py
index 9b2729f141e..a5f119e3a2b 100644
--- a/homeassistant/components/atag/climate.py
+++ b/homeassistant/components/atag/climate.py
@@ -46,6 +46,7 @@ class AtagThermostat(AtagEntity, ClimateEntity):
     _attr_supported_features = (
         ClimateEntityFeature.TARGET_TEMPERATURE | ClimateEntityFeature.PRESET_MODE
     )
+    _enable_turn_on_off_backwards_compatibility = False
 
     def __init__(self, coordinator, atag_id):
         """Initialize an Atag climate device."""