diff --git a/homeassistant/components/climate/__init__.py b/homeassistant/components/climate/__init__.py
index f9405e4b040cb..d00d30c3b1945 100644
--- a/homeassistant/components/climate/__init__.py
+++ b/homeassistant/components/climate/__init__.py
@@ -693,8 +693,14 @@ def max_humidity(self):
 
     def _convert_for_display(self, temp):
         """Convert temperature into preferred units for display purposes."""
-        if temp is None or not isinstance(temp, Number):
+        if temp is None:
             return temp
+
+        # if the temperature is not a number this can cause issues
+        # with polymer components, so bail early there.
+        if not isinstance(temp, Number):
+            raise TypeError("Temperature is not a number: %s" % temp)
+
         if self.temperature_unit != self.unit_of_measurement:
             temp = convert_temperature(
                 temp, self.temperature_unit, self.unit_of_measurement)
diff --git a/homeassistant/components/climate/mysensors.py b/homeassistant/components/climate/mysensors.py
index adf44a818292b..9fd6059acbe12 100755
--- a/homeassistant/components/climate/mysensors.py
+++ b/homeassistant/components/climate/mysensors.py
@@ -67,7 +67,7 @@ def temperature_unit(self):
     @property
     def current_temperature(self):
         """Return the current temperature."""
-        return self._values.get(self.gateway.const.SetReq.V_TEMP)
+        return float(self._values.get(self.gateway.const.SetReq.V_TEMP))
 
     @property
     def target_temperature(self):
@@ -79,21 +79,21 @@ def target_temperature(self):
         temp = self._values.get(set_req.V_HVAC_SETPOINT_COOL)
         if temp is None:
             temp = self._values.get(set_req.V_HVAC_SETPOINT_HEAT)
-        return temp
+        return float(temp)
 
     @property
     def target_temperature_high(self):
         """Return the highbound target temperature we try to reach."""
         set_req = self.gateway.const.SetReq
         if set_req.V_HVAC_SETPOINT_HEAT in self._values:
-            return self._values.get(set_req.V_HVAC_SETPOINT_COOL)
+            return float(self._values.get(set_req.V_HVAC_SETPOINT_COOL))
 
     @property
     def target_temperature_low(self):
         """Return the lowbound target temperature we try to reach."""
         set_req = self.gateway.const.SetReq
         if set_req.V_HVAC_SETPOINT_COOL in self._values:
-            return self._values.get(set_req.V_HVAC_SETPOINT_HEAT)
+            return float(self._values.get(set_req.V_HVAC_SETPOINT_HEAT))
 
     @property
     def current_operation(self):