Air Handling Units are devices that work for bringing the environment to the desired temperature, relative humidity and desired air cleanliness values. It controls four variables: air temperature, humidity, air speed and air quality.In air conditioning control systems, there are two types of methods as aqueous air conditioning and air to air conditioning. In aqueous air conditioning systems, there is an external source that produces hot and cold water.Air handling units or fan coil units are used to deliver the heat energy on the water to the environment. Air-to-air conditioning, another method in air conditioning systems, is fluid air used for heat transfer. The units used in such systems are package type air handling units and rooftop units. For applications such as air handling units and rooftop units, HAVKON control equipments, humidity and temperature detection equipments, fan speed control devices can meet a wide variety of needs by offering flexible solutions.