diff --git a/src/espmega_iot_core.cpp b/src/espmega_iot_core.cpp
index df30835..cfece8d 100644
--- a/src/espmega_iot_core.cpp
+++ b/src/espmega_iot_core.cpp
@@ -699,6 +699,10 @@ void ac_set_state(int mode, int temperature, int fan_speed)
 {
   ac_mode = mode;
   ac_temperature = temperature;
+  if (ac_temperature < AC_MIN_TEMPERATURE)
+    ac_temperature = AC_MIN_TEMPERATURE;
+  else if (ac_temperature > AC_MAX_TEMPERATURE)
+    ac_temperature = AC_MAX_TEMPERATURE;
   ac_fan_speed = fan_speed;
   temperature -= AC_MIN_TEMPERATURE;