With the improvement of electrical equipment integration degree, equipment unit volume power density increase, also more and more strict control of the indoor temperature, room temperature control equipment to ensure good indoor environment is becoming more and more important to the equipment room dedicated brand cooling air conditioning units,24"365 full-year refrigeration,effectively reduce the indoor temperature, and can consider introducing outdoor air to replace the wind, reduce the refrigeration system on time, according to the setting of indoor temperature and outdoor natural temperature difference between air section.