DOE - Active Solar HeatingFrom the EERE Energy Savers pages.
Space Heating for Commercial BuildingsFrom the Florida Solar Energy Center at the University of Central Florida.
Space Heating with Active Solar Energy SystemsFrom North Carolina State University.
In February 2014, the Arizona Republic's Ryan Randazzo wrote about a plan drafted by a political consulting group commissioned by the state's largest utility "to help APS change or alter the Arizona Corporation Commission".
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