GEOCITY是一个计算机模拟模型，用于研究利用地热能进行区域供暖/制冷的经济性。1 GEOCITY根据气候、人口、资源特征和融资条件计算区域供暖/制冷成本。主要的输入变量是最低和最高温度、加热度天数和冷却度小时数、人口规模和密度、资源温度和与负荷中心的距离、住房类型和利率。根据这些输入数据，模型设计了传输和区域供暖/制冷系统。 根据该设计，GEOCITY计算整个系统的资本和运营成本，包括地热水的生产和处理。地热能成本分析的基础是单位能源成本，它将收回所有生产成本——资本投资、运营费用、税费和规定的资本回报率。单位能源成本的计算基于生命周期成本计算和折现现金流分析。地热区域供暖和制冷的潜在成本可能会有很大的变化。 成本的范围取决于资源的特性、需求的特性以及资源和需求之间的距离。本文对生产过程中的每一个主要部分的成本进行了分析。在一组一致的假设下，还确定了这些成本对几个重要参数的敏感性。引文:德克萨斯州休斯顿ASHRAE学报第88卷第1部分研讨会

GEOCITY is a computer simulation model developed to study the economics of district heating/ cooling using geothermal energy.1 GEOCITY calculates the cost of district heating/cooling based on climate, population, resource characteristics, and financing conditions. The principal input variables are minimum and maximum temperatures, heating degree-days and cooling degree-hours, population size and density, resource temperature and distance from load center, housing type, and the interest rate. From this input data the model designs the transmission and district heating/cooling systems. From this design, GEOCITY calculates the capital and operating costs for the entire system, including the production and disposal of the geothermal water.The basis for the geothermal energy cost analysis is the unit cost of energy which will recover all the costs of production -- capital investment, operating expenses, taxes, and the specified rates of return on capital. The calculation of the unit cost of energy is based on life cycle costing and discounting cash flow analysis. A wide variation can be expected in the range of potential geothermal district heating and cooling costs. The range of costs is determined by the characteristics of the resource, the characteristics of the demand, and the distance separating the resource and the demand. In this paper, costs were developed for each of the main parts of the production process. The sensitivity of these costs to several significant parameters under a consistent set of assumptions were also determined.