In 2013, Vermont homeowners installed 2,400 air-source heat pumps—or minisplits—nearly all of them in existing buildings. No doubt some people were motivated to reduce their carbon footprint, but probably, the overwhelming majority were interested in lowering their annual heating bills.

In other parts of the U.S., minisplits' effectiveness at lowering energy bills is documented. The Pacific Northwest's Bonneville Power Administration (bpa.gov) study showed up to 50% savings in electric consumption with minisplits when compared with zonal electric heaters. Efficiency Maine (efficiencymaine.com) promotes the installation of...

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