The heating test was conducted in a glass-covering multi-span greenhouse (756m2) with groundwater-style GSHP technology. The heat quantity estimating models based on air enthalpy difference method (AEDM) were developed according to the heating characteristics of GSHP. The economical performance and carbon footprint (greenhouse gas emission level) of the GSHP was analyzed and compared with currently widely used coal fired heating system (CFHs）and natural gas fired heating system (GFHs) based on investigated various energy sources price during heating tests. According to the compared results, the GSHPs heating cost is higher than CFHs, but lower than GFHs. Meanwhile, GSHPs CO2 emission during heating is higher than GFHs, but lower than CFHs.