Surface shallow geothermal resources (usually less than 400 meters deep) can be called Earth Energy (Earth Energy), refers to the surface soil, groundwater or rivers, lakes absorb solar energy, geothermal energy and low-lying latent heat. Ground source heat pump is the use of such low-temperature heat energy, as a heat pump heat pump and air-conditioning cold source, both heating and air conditioning system. Winter, the heat pump to the surface of the shallow heat / take / out, supply indoor heating; summer to take out the heat inside the house, released to the shallow surface to go. Ground source heat pump features are: 1 is a renewable energy technology Surface shallow like a huge solar collector, collecting 47% of the solar energy, more than 500 times the human use of energy each year more. This near-infinite, geographical and resource-limited low-enthalpy heat is a clean renewable energy available to mankind. And unlike the solar energy can not be affected by the climate, nor the deep geothermal by the resources and geological structure constraints. In addition, ground source heat pump in winter heating, at the same time on the ground to store cold, to prepare for summer, summer air conditioning, but also to the ground to store calories for winter use. So ground source heat pump is a renewable energy technology. 2 energy-efficient and low operating costs As the ground source temperature is relatively stable throughout the year, the winter than the ambient air temperature is higher than the ambient air temperature in summer is low, is a good source of heat pump heat pump and air-conditioning, the temperature characteristics of the ground source heat pump 40% higher than the traditional air-conditioning system operating efficiency, so to save energy and save about 40% of operating costs. 3 Significant environmental benefits Without destroying groundwater resources and without any pollution, it can be built in residential areas. There is no burning, no smoke emission and no waste. There is no need to store fuel and waste sites, and no long-distance heat transfer. 4 dual-purpose ground source heat pump can be heating and cooling, hot and cold supply throughout the year, saving investment and land. Ground source heat pump, a kind of renewable energy utilization technology, is highly efficient and energy-saving without any pollution. It conforms to the trend of international energy development and conforms to China's energy and environmental protection policy. It is worth studying and energetically developing renewable energy utilization.