What is the principle of hotel air conditioning heating?

What you should say is central air conditioning. If it is a room air conditioner, it should be the same as a home air conditioner. Generally, central air conditioners use diesel to burn hot water for circulating heating. That is, hot water is circulated by the water pump, passes through the evaporator at each tuyere, and the fan blows out hot air from behind the evaporator. Heating and cooling are similar, except that refrigerant is needed for cooling and cooling tower is used for cooling.