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In northern Minnesota, early adopters make the case for cold-climate heat pumps
Michael Overend and Lucy Grina love to show visitors around their home, a modest four-bedroom rambler, built in 1965 on a gravel road just north of Duluth. The couple’s pride, however, did not always extend to one feature: the utility bills. “We were embarrassed about how much heat this old house was leaking,” Overend said. […]