A temperature control system for a building comprises a thermal collection system, a plurality of underground heat sinks, and a heat exchanger. The thermal collection system includes at least one fluid channel. The thermal collection system is configured to heat or cool fluid within the at least one fluid channel. A first and a second underground heat sink are configured to receive the fluid from the thermal collection system. The first underground heat sink absorbs heat from the fluid in order to heat the first underground heat sink. The second underground heat sink transfers heat to the fluid in order to cool the second underground heat sink. The heat exchanger is configured to receive fluid from the first or second underground heat sink in order to heat or cool the building.