As HTK, we have added Heat recovery units to our product range. Our heat recovery units are produced in a wide range from 1000 m3 / h to 5,000 m3 / h. Heat recovery units basically work with the principle of adding energy from the environment to the fresh air supplied to the environment. In a place where heat recovery unit is used, for the purpose of ventilation, the fresh air to be taken in is cooled while the cooled air in the environment is expelled in summer. In winter, while the hot air in the environment is expelled, the fresh air to be taken inside is heated. Thus, energy savings of up to 70% are achieved. While doing these operations, heat recovery units do not use any energy source, they provide air to air heat recovery.