Efficiency is America's biggest, cheapest, cleanest, quickest—and mostly untapped—energy resource. Indeed, it could reduce U.S. energy consumption by 40 to 60 percent by 2050. Yet energy efficiency—not the least of which could be fulfilled by geothermal heat pumps (GHPs)—has been largely ignored as a strategy for compliance with air regulations. Public officials (especially at the state level) have so far
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