As the living conditions and housing standards are improving, energy demand all over the world is increasing as well. As such, sustainable buildings design that offers methods for reducing the energy demand, increasing the energy efficiency and usage of alternative renewable sources of energy has become widespread (GhaffarianHoseini et al., 2013; Kothari et al., 2010). A significant component of total global energy demand relates to the energy used to heat and cool buildings. For example, in Canada in 2009, 49% of all institutional energy use was for space heating (NRC, 2011). In order to reduce the greenhouse emissions due to indoor temperature regulation, technologies that use alternative and renewable sources of energy must be developed and applied. Among different sources of renewable energies, Ground Source Heat Pump systems (GSHPs), also known as geo-exchange systems, are a promising source of energy for heating and cooling buildings (Blum, Campillo, Munch, & Kolbel, 2010; Omer, 2008; Wang & Qi, 2008). Such systems extract heat from the ground during the cold seasons or inject heat to the ground during the warm seasons by circulating a heat carrier fluid between a heat pump and a ground loop system through heat exchanger pipes. The ground loop system can be vertical boreholes or horizontal trenches.