Except that electricity use in buildings produces three times more GHGs than the direct use of natural gas (even after accounting for methane). Electricity is 2.5x's more GHGs if we include fuel oil and propane also.https://twitter.com/bradplumer/status/1007281096487251970 …
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Yes, fair enough. I meant air-source heat pumps. Ground source HPs are simply not a feasible technology for many households, so often the default is to discuss "heat pumps" with the implication they are air-sourced.
New companies, like @DandelionEnergy, the Google X spin-off, have dramatically reduced the up-front cost of Geothermal Heat Pumps. In New York today, average homes can get GHP for about $20K when it used to cost $35K to $40K per home. Not all heat pumps are air-source!