1. ASHRAE (2011) Handbook of HVAC applications. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta
2. Liu X, Lu S, Hughes P, Cai Z (2015) A comparative study of the status of GSHP applications in the United States and China. Renew Sust Energ Rev 48:558–570
3. U.S. EPA (United States Environmental Protection Agency) Global greenhouse gas emissions data.
http://www.epa.gov/climatechange/ghgemissions/global.html
4. Navigant Research (2013) Geothermal heat pumps residential and commercial applications for geothermal heat pumps: global market analysis and forecasts. Navigant Consulting
5. Ellis D (2008) Field experience with ground-source heat pumps in affordable low energy housing. In: Proceedings of ninth international energy agency heat pump conference. Zurich, 20–22 May 2008