"We each must do our share in ensuring that future generations have safe and clean energy sources while not compromising our comfort or budget. Geo Power shows how that is possible with ground-source heat pumps. With this book, my students and trainees are able to understand not only why geothermal can be used, but the scientific reasons and evidence for its effectiveness. And for homeowners looking for a safe and sustainable alternative to fossil fuels, or businesses needing to reduce operating costs, this is the right book at the right time."
- Lawrence A. Muhammad, IGSHPA Certified National Trainer, IGSHPA Accredited Installer, and Professor at Michigan Community Colleges
"Geo Power is especially designed to help spread the word about ground-source or geothermal heat pump systems (GHPS) to the world, and it does an excellent job of explaining how a GHPS works for health, safety, heating, cooling and hot water. I recommend reading Geo Power to understand the most energy saving comfort system for your home or commercial property."
- Gerald R. McClain, Distance Learning Coordinator, International Ground Source Heat Pump Association
Lloyd expands his 2011 Smart Guide to Geothermal by delving deeply into the nifty science behind ground-source heating. "Simple in concept, complex in practice," geothermal heat pump systems (GHPs) use the earth as both a heat source and heat sink. Heat is transferred from ground to building via an underground piping loop that uses soil temperature to warm or cool the refrigerant (or water) circulating within. Various kinds of ground-source systems (open loop, closed loop, direct exchange, etc.) and pipe layouts are discussed and illustrated. Although growing in popularity, GHPs are underutilized because, writes Lloyd, they are relatively unknown and misunderstood; his book should help on both counts. The author thoroughly crunches the numbers concerning the economics of system installation and its running. His experience with the technology sensibly and candidly discusses pros (e.g., clean, superefficiency), and cons (e.g., high up-front cost) are fairly weighed and explained. The book's handsome design and generous supplementary information (e.g., glossary, FAQs, lists) combine to aid comprehension. VERDICT Lloyd makes a complex subject accessible and helpful to a broad audience, from interested homeowners to system installers. A solid addition to all "renewables" collections.
— Robert Eagan, Library Journal, 2015