Energy is an important material foundation of living and development in human society. On account of the overall energy utilization inefficiency and serious environmental pollution

it is essential to attach great importance to the optimization of energy consumption structure

as well as encourage use of clean energy. Air-conditioning energy consumption accounts for large proportion of the whole construction energy consumption. Through a particular engineering project

this paper compared three cold and heat source schemes in the aspect of technology and economy

and analyzed whether they were practicable. Due to the abundant fuel-gas resources in Chongqing

the Cooling Heating and Power system of gas supply could not only improve the efficiency of comprehensive energy utilization

but can also balance the consumption of electric power and gas and improve the city’s energy structure

which can yet be regarded as a good cold and heat source plan.