Heat pumps are a technology that can 'pump' heat from the environment (solar energy) into buildings. Most heat pumps are ground-source i.e. they extract their energy from the earth. Others extract the energy from water i.e. a lake or stream.
There is only one book recommended on heat pumps right now. Some free useful downloads in pdf format can be found at the bottom of this page.
GEOTHERMAL HEAT PUMPS - A Guide for Installers, Architects and Engineers is the most comprehensive guide to the selection, design and installation of ground-source heat pumps currently available. The books covers heat pump theory, heat pump types, planning, installation, sizing, building heating and cooling, domestic hot water production - water-source systems and air-source systems are also covered. Full-colour illustrations throughout. 297 x 100mm, 224 pages, £49.99.

Some informative downloads on heat pumps:
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