Dehumidification Units are units designed to reduce the humidity value of the environment. Generally, the usage areas of the dehumidification units are indoor swimming pools. In indoor swimming pools, when the humidity rate exceeds 65%, the corrosion effect of the chlorinated water condensing in the pool causes the metal, wood and surfaces on the walls to rot.In addition, it causes the formation of harmful microorganisms such as microbes, bacteria and fungi in the environment. By monitoring the external air humidity, internal air humidity, external air temperature, internal air temperature in HAVKON dehumidification units; Thanks to the proportional damper actuators for energy efficiency, fresh air supported dehumidification control is performed. With the 3-way valve control, the temperature control of the environment with external source heating water is provided proportionally.