‌HVAC‌ (Heating, Ventilation and Air Conditioning) is a general term for heating, ventilation and air conditioning systems. It achieves comprehensive 

control of the building's internal environment by integrating temperature control, air circulation and environmental quality optimization technologies.

‌Functional scope‌

‌Heating‌: Provide heat energy through boilers, heat pumps and other equipment to meet winter heating needs

‌Ventilation‌: Use fans, air ducts and other equipment to achieve indoor and outdoor air exchange, maintain oxygen concentration and discharge pollutants

‌Air conditioning‌: Combine refrigeration units (such as chillers) and terminal devices (such as fan coils) to adjust indoor temperature and humidity

‌Technical features‌

Possess the ability to coordinate air temperature, humidity, cleanliness and circulation rate to ensure environmental comfort

Adopt multi-loop design (such as chilled water loop, cooling water loop) to achieve energy transfer, and coordinate equipment operation through control systems

‌Application areas‌

As the core system of building environmental engineering, it is widely used in residential, commercial buildings and industrial facilities

It is not only a branch of engineering technology, but also a representative of the industrial chain involving equipment manufacturing, operation and maintenance services