Recently, geothermal heat pumps (GHPs), which are normally known as ground source heat pumps (GSHPs), offer some advantages for heating and cooling of residential and commercial buildings due to the higher energy efficiency compared with conventional EHP system. In Korea, the renewable energy sources are forced to apply to the public buildings, which have over 3,000 m² of floor area according to the law. While GHPs may be more costly to install initially than regular heat pumps, they can also produce markedly lower energy bills. For this reason, GHPs are scrutinized as the heating and cooling alternatives in renovation of the campus buildings in Korea. In this study, we would like to investigate the application methods of GHPs for renovation of campus building, and to compare the energy costs of GHPs with that of conventional system. Also, the objective of this study is to present an operation status of GSHPs in renovated campus building as an example.