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.
The parable of the frog and boiling water is hundreds of years old. It has been used throughout history as a metaphor for circumstances in life when people are unable to see gradual change around them.
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