To further understand the energy quality utilization of air conditioning and heating system

the exergy analysis based on specific consumption analysis was studied. The exergy coefficient computational methods of some typical air conditioning and heating systems (boiling heating

electric heating

heat hump

absorption unit) were studied

and the general formula of exergy coefficient was summarized. To express mean exergy coefficient of the whole season

two mean exergy coefficient computational methods for air conditioning and heating system were proposed: heat weighted temperature method and fuel weighted method

and so the exergy analysis for air conditioning and heating system was improved. By taking the heating in Beijing as an example

the First & Second Law of Thermodynamics based coefficients of typical air conditioning and heating systems were developed

and from these numerical values

the energy (quality) utilization of air conditioning and heating systems in different loads was fully obtained.