diff --git a/homeassistant/components/climate/nest.py b/homeassistant/components/climate/nest.py
index ab41c10e6d1..e098c3c3709 100644
--- a/homeassistant/components/climate/nest.py
+++ b/homeassistant/components/climate/nest.py
@@ -155,8 +155,8 @@ class NestThermostat(ClimateDevice):
         """Set new target temperature."""
         target_temp_low = kwargs.get(ATTR_TARGET_TEMP_LOW)
         target_temp_high = kwargs.get(ATTR_TARGET_TEMP_HIGH)
-        if target_temp_low is not None and target_temp_high is not None:
-            if self._mode == STATE_HEAT_COOL:
+        if self._mode == STATE_HEAT_COOL:
+            if target_temp_low is not None and target_temp_high is not None:
                 temp = (target_temp_low, target_temp_high)
         else:
             temp = kwargs.get(ATTR_TEMPERATURE)