BRIGHTON, COLO. — One of Colorado’s largest geothermal projects is soon drawing to a close. When finished, Solaire Apartments, in Brighton, Colo., will be entirely heated and cooled by ground-source heat pumps. The 252 unit, 12-building complex uses 112 wells to provide 326 tons of heating and cooling capacity. The up-front premium associated with a ground-source system hasn’t made them popular with property owners in the rental business, but the owners at Solaire see the ...

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