diff --git a/modules/base_plugins/fermenter_hysteresis/__init__.py b/modules/base_plugins/fermenter_hysteresis/__init__.py
index 9c7e1b5..f3d6efe 100644
--- a/modules/base_plugins/fermenter_hysteresis/__init__.py
+++ b/modules/base_plugins/fermenter_hysteresis/__init__.py
@@ -13,6 +13,7 @@ class Hysteresis(FermenterController):
 
         super(FermenterController, self).stop()
         self.heater_off()
+        self.cooler_off()
 
     def run(self):
         while self.is_running():
@@ -23,5 +24,11 @@ class Hysteresis(FermenterController):
                 self.heater_off()
             else:
                 self.heater_off()
+            if self.get_temp() > self.get_target_temp() + int(self.on):
+                self.cooler_on()
+            elif self.get_temp() <= self.get_target_temp() + int(self.off):
+                self.cooler_off()
+            else:
+                self.cooler_off()
             self.sleep(1)
 
diff --git a/modules/core/controller.py b/modules/core/controller.py
index 0db42c7..bd4a052 100644
--- a/modules/core/controller.py
+++ b/modules/core/controller.py
@@ -125,6 +125,18 @@ class FermenterController(ControllerBase, ActorController, SensorController):
         if f.heater is not None:
             self.actor_off(int(f.heater))
 
+    @cbpi.try_catch(None)
+    def cooler_on(self):
+        f = self.api.cache.get("fermenter").get(self.fermenter_id)
+        if f.cooler is not None:
+            self.actor_on(id=int(f.cooler))
+
+    @cbpi.try_catch(None)
+    def cooler_off(self):
+        f = self.api.cache.get("fermenter").get(self.fermenter_id)
+        if f.cooler is not None:
+            self.actor_off(int(f.cooler))
+
     @cbpi.try_catch(None)
     def get_temp(self, id=None):