diff --git a/docs/Config_Reference.md b/docs/Config_Reference.md
index 8b17d9502..da27624f3 100644
--- a/docs/Config_Reference.md
+++ b/docs/Config_Reference.md
@@ -3349,6 +3349,9 @@ information.
 #   The minimum fan speed (expressed as a value from 0.0 to 1.0) that
 #   the fan will be set to for PID temperature fans.
 #   The default is 0.3.
+#invert_control: False
+#   The control output is inverted. Useful for bed fans that
+#   are supposed to increase temperature instead of decreasing it.
 #gcode_id:
 #   If set, the temperature will be reported in M105 queries using the
 #   given id. The default is to not report the temperature via M105.
diff --git a/klippy/extras/temperature_fan.py b/klippy/extras/temperature_fan.py
index a9aa4d0ba..fc6172881 100644
--- a/klippy/extras/temperature_fan.py
+++ b/klippy/extras/temperature_fan.py
@@ -38,6 +38,7 @@ class TemperatureFan:
         algos = {'watermark': ControlBangBang, 'pid': ControlPID}
         algo = config.getchoice('control', algos)
         self.control = algo(self, config)
+        self.invert_control = config.getboolean('invert_control', False)
         self.next_speed_time = 0.
         self.last_speed_value = 0.
         gcode = self.printer.lookup_object('gcode')
@@ -70,6 +71,8 @@ class TemperatureFan:
         return self.min_speed
     def get_max_speed(self):
         return self.max_speed
+    def get_invert_control(self):
+        return self.invert_control
     def get_status(self, eventtime):
         status = self.fan.get_status(eventtime)
         status["temperature"] = round(self.last_temp, 2)
@@ -127,7 +130,7 @@ class ControlBangBang:
         elif (not self.heating
               and temp <= target_temp-self.max_delta):
             self.heating = True
-        if self.heating:
+        if self.heating != self.temperature_fan.get_invert_control():
             self.temperature_fan.set_tf_speed(read_time, 0.)
         else:
             self.temperature_fan.set_tf_speed(
@@ -170,6 +173,9 @@ class ControlPID:
         temp_integ = max(0., min(self.temp_integ_max, temp_integ))
         # Calculate output
         co = self.Kp*temp_err + self.Ki*temp_integ - self.Kd*temp_deriv
+        # Handle inverted control
+        if self.temperature_fan.get_invert_control():
+            co = self.temperature_fan.get_max_speed() - co
         bounded_co = max(0., min(self.temperature_fan.get_max_speed(), co))
         self.temperature_fan.set_tf_speed(
             read_time, max(self.temperature_fan.get_min_speed(),