diff --git a/.coveragerc b/.coveragerc
index b519d87c0be..f9f03ac2215 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -213,6 +213,7 @@ omit =
     homeassistant/components/camera/rpi_camera.py
     homeassistant/components/camera/synology.py
     homeassistant/components/climate/eq3btsmart.py
+    homeassistant/components/climate/flexit.py
     homeassistant/components/climate/heatmiser.py
     homeassistant/components/climate/homematic.py
     homeassistant/components/climate/knx.py
diff --git a/homeassistant/components/climate/flexit.py b/homeassistant/components/climate/flexit.py
new file mode 100644
index 00000000000..5911486c761
--- /dev/null
+++ b/homeassistant/components/climate/flexit.py
@@ -0,0 +1,148 @@
+"""
+Platform for Flexit AC units with CI66 Modbus adapter.
+
+Example configuration:
+
+climate:
+  - platform: flexit
+    name: Main AC
+    slave: 21
+
+For more details about this platform, please refer to the documentation
+https://home-assistant.io/components/climate.flexit/
+"""
+import logging
+import voluptuous as vol
+
+from homeassistant.const import (
+    CONF_NAME, CONF_SLAVE, TEMP_CELSIUS,
+    ATTR_TEMPERATURE, DEVICE_DEFAULT_NAME)
+from homeassistant.components.climate import (ClimateDevice, PLATFORM_SCHEMA)
+import homeassistant.components.modbus as modbus
+import homeassistant.helpers.config_validation as cv
+
+REQUIREMENTS = ['pyflexit==0.3']
+DEPENDENCIES = ['modbus']
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_SLAVE): vol.All(int, vol.Range(min=0, max=32)),
+    vol.Optional(CONF_NAME, default=DEVICE_DEFAULT_NAME): cv.string
+})
+
+_LOGGER = logging.getLogger(__name__)
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Set up the Flexit Platform."""
+    modbus_slave = config.get(CONF_SLAVE, None)
+    name = config.get(CONF_NAME, None)
+    add_devices([Flexit(modbus_slave, name)], True)
+
+
+class Flexit(ClimateDevice):
+    """Representation of a Flexit AC unit."""
+
+    def __init__(self, modbus_slave, name):
+        """Initialize the unit."""
+        from pyflexit import pyflexit
+        self._name = name
+        self._slave = modbus_slave
+        self._target_temperature = None
+        self._current_temperature = None
+        self._current_fan_mode = None
+        self._current_operation = None
+        self._fan_list = ['Off', 'Low', 'Medium', 'High']
+        self._current_operation = None
+        self._filter_hours = None
+        self._filter_alarm = None
+        self._heat_recovery = None
+        self._heater_enabled = False
+        self._heating = None
+        self._cooling = None
+        self._alarm = False
+        self.unit = pyflexit.pyflexit(modbus.HUB, modbus_slave)
+
+    def update(self):
+        """Update unit attributes."""
+        if not self.unit.update():
+            _LOGGER.warning("Modbus read failed")
+
+        self._target_temperature = self.unit.get_target_temp
+        self._current_temperature = self.unit.get_temp
+        self._current_fan_mode =\
+            self._fan_list[self.unit.get_fan_speed]
+        self._filter_hours = self.unit.get_filter_hours
+        # Mechanical heat recovery, 0-100%
+        self._heat_recovery = self.unit.get_heat_recovery
+        # Heater active 0-100%
+        self._heating = self.unit.get_heating
+        # Cooling active 0-100%
+        self._cooling = self.unit.get_cooling
+        # Filter alarm 0/1
+        self._filter_alarm = self.unit.get_filter_alarm
+        # Heater enabled or not. Does not mean it's necessarily heating
+        self._heater_enabled = self.unit.get_heater_enabled
+        # Current operation mode
+        self._current_operation = self.unit.get_operation
+
+    @property
+    def device_state_attributes(self):
+        """Return device specific state attributes."""
+        return {
+            'filter_hours':     self._filter_hours,
+            'filter_alarm':     self._filter_alarm,
+            'heat_recovery':    self._heat_recovery,
+            'heating':          self._heating,
+            'heater_enabled':   self._heater_enabled,
+            'cooling':          self._cooling
+        }
+
+    @property
+    def should_poll(self):
+        """Return the polling state."""
+        return True
+
+    @property
+    def name(self):
+        """Return the name of the climate device."""
+        return self._name
+
+    @property
+    def temperature_unit(self):
+        """Return the unit of measurement."""
+        return TEMP_CELSIUS
+
+    @property
+    def current_temperature(self):
+        """Return the current temperature."""
+        return self._current_temperature
+
+    @property
+    def target_temperature(self):
+        """Return the temperature we try to reach."""
+        return self._target_temperature
+
+    @property
+    def current_operation(self):
+        """Return current operation ie. heat, cool, idle."""
+        return self._current_operation
+
+    @property
+    def current_fan_mode(self):
+        """Return the fan setting."""
+        return self._current_fan_mode
+
+    @property
+    def fan_list(self):
+        """Return the list of available fan modes."""
+        return self._fan_list
+
+    def set_temperature(self, **kwargs):
+        """Set new target temperature."""
+        if kwargs.get(ATTR_TEMPERATURE) is not None:
+            self._target_temperature = kwargs.get(ATTR_TEMPERATURE)
+        self.unit.set_temp(self._target_temperature)
+
+    def set_fan_mode(self, fan):
+        """Set new fan mode."""
+        self.unit.set_fan_speed(fan)
diff --git a/homeassistant/const.py b/homeassistant/const.py
index bb0d491ab1f..c50fa3034c6 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -142,6 +142,7 @@ CONF_SENDER = 'sender'
 CONF_SENSOR_CLASS = 'sensor_class'
 CONF_SENSOR_TYPE = 'sensor_type'
 CONF_SENSORS = 'sensors'
+CONF_SLAVE = 'slave'
 CONF_SSL = 'ssl'
 CONF_STATE = 'state'
 CONF_STRUCTURE = 'structure'
diff --git a/requirements_all.txt b/requirements_all.txt
index 4deaf251ed0..802928438fc 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -539,6 +539,9 @@ pyenvisalink==2.1
 # homeassistant.components.sensor.fido
 pyfido==1.0.1
 
+# homeassistant.components.climate.flexit
+pyflexit==0.3
+
 # homeassistant.components.ifttt
 pyfttt==0.3