"Ground-source heat pump sales rose 37 percent from 2017 to 2018 ... — although geothermal remains just 1.7 percent of the market."https://www.achrnews.com/articles/141242-when-heat-pumps-are-the-right-decision …
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"Ground-source heat pump sales rose 37 percent from 2017 to 2018 ... — although geothermal remains just 1.7 percent of the market."https://www.achrnews.com/articles/141242-when-heat-pumps-are-the-right-decision …
