The direct use of seasonal differences in temperature between underground soils and aboveground space, air-conditioning cooling in the summer and heating and heating in the winter has now become a reality. At present, the ground source heat pump technology has been successfully tested by many Tianjin researchers for many years. Many Tianjin enterprises have also developed this technology into a buried pipe-type ground source heat pump with a wider range of applications. The technology is now used in Tianjin Hongqiao District veterans activity center and other projects. At present, the state encourages the development of renewable energy and new energy high-tech industries, including solar heating and ground-source heat pump heating and cooling are included in the key areas. According to reports, the underground soil is rich in temperature resources, soil temperature in summer under the ground above the temperature of the ground, underground soil temperature in winter is higher than the temperature above the ground. Ground source heat pump technology is the use of this seasonal temperature difference, through special devices in the summer will be the transformation of low-temperature underground soil resources to the ground space for cooling in winter will be the underground soil heat resources to heat transfer to the ground space. Buried ground-source heat pump is more direct, it buried the heat exchanger in the soil, the tube has a closed water cycle and soil heat exchange, the winter to absorb soil heat, the heat released to the soil in the summer to be stored until Reuse in winter will not have any impact on groundwater resources. Central air-conditioning using this technology does not burn the fuel, no gas, not coal, according to the need for flexible control, switch by yourself, warm and cold. Technical staff said that by 2005 the city's housing construction area of ​​30 million square meters, if the construction of 10 million square meters of underground pipe heat pump technology, annual savings of 119,000 tons of standard coal can reduce flue gas emissions 13 Billion cubic meters, and than the traditional central air conditioning system running costs reduced by 30% to 60%.