diff --git a/main/control.c b/main/control.c
index f27a9a7..42eb184 100644
--- a/main/control.c
+++ b/main/control.c
@@ -15,7 +15,8 @@
 #define RETURN_FLOW_TEMPERATURE_LOWER_LIMIT_NIGHT 25.0f
 #define CHAMBER_TEMPERATURE_TARGET 80.0f             // Max cutoff temperature
 #define CHAMBER_TEMPERATURE_THRESHOLD 45.0f          // Min threshold for burner enable
-#define OUTDOOR_TEMPERATURE_THRESHOLD 13.0f          // Min threshold for burner enable
+#define SUMMER_MODE_TEMPERATURE_THRESHOLD_HIGH 20.0f // Summer mode will be activated
+#define SUMMER_MODE_TEMPERATURE_THRESHOLD_LOW 15.0f  // Summer mode will be deactivated --> Heating starts
 #define CIRCULATION_PUMP_TEMPERATURE_THRESHOLD 30.0f // Min threshold of chamber for circulation pump enable
 #define BURNER_FAULT_DETECTION_THRESHOLD (60U * 4U)  // Burner fault detection after 4 minutes
 
@@ -62,6 +63,7 @@ void initControl(void)
 void taskControl(void *pvParameters)
 {
     bool bHeatingInAction = false;
+    bool bSummerMode = false;
     eBurnerState eBurnerState = BURNER_UNKNOWN;
     int64_t i64BurnerEnableTimestamp = esp_timer_get_time();
 
@@ -101,10 +103,19 @@ void taskControl(void *pvParameters)
 
         sControlTemperatureEntry currentControlEntry = getCurrentTemperatureEntry();
 
+        if (getOutdoorTemperature().average60s.fValue >= SUMMER_MODE_TEMPERATURE_THRESHOLD_HIGH)
+        {
+            bSummerMode = true;
+        }
+        else if (getOutdoorTemperature().average60s.fValue <= SUMMER_MODE_TEMPERATURE_THRESHOLD_LOW)
+        {
+            bSummerMode = false;
+        }
+
         // Enable burner if outdoor temperature is low and return flow temperature is cooled down
         if (!bHeatingInAction && (eBurnerState != BURNER_FAULT))
         {
-            if (getOutdoorTemperature().average60s.fValue >= OUTDOOR_TEMPERATURE_THRESHOLD)
+            if (bSummerMode)
             {
                 // ESP_LOGI(TAG, "Outdoor temperature too warm: Disabling heating");
                 setBurnerState(DISABLED);