diff --git a/homeassistant/components/oem/climate.py b/homeassistant/components/oem/climate.py
index 1b600b25d94..86c770ec82d 100644
--- a/homeassistant/components/oem/climate.py
+++ b/homeassistant/components/oem/climate.py
@@ -66,8 +66,13 @@ class ThermostatDevice(ClimateEntity):
     """Interface class for the oemthermostat module."""
 
     _attr_hvac_modes = SUPPORT_HVAC
-    _attr_supported_features = ClimateEntityFeature.TARGET_TEMPERATURE
+    _attr_supported_features = (
+        ClimateEntityFeature.TARGET_TEMPERATURE
+        | ClimateEntityFeature.TURN_OFF
+        | ClimateEntityFeature.TURN_ON
+    )
     _attr_temperature_unit = UnitOfTemperature.CELSIUS
+    _enable_turn_on_off_backwards_compatibility = False
 
     def __init__(self, thermostat, name):
         """Initialize the device."""