The use of heat pumps in connection with solar thermal energy systems is becoming increasingly popular in Central Europe. Other countries are also finding this combination attractive.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/auxiliary-heating-its-way
[2] http://admin.indiaenvironmentportal.org.in/category/author/stefan-trojek
[3] http://admin.indiaenvironmentportal.org.in/category/journal/sun-and-wind-energy
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/solar-energy
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/solar-thermal-power
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heat-pumps
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe