How will 10 million heat pumps behave from a grid operator’s perspective? Big data and research gap that the Great Lakes and Northeast states can solve together. (Homeowners + manufacturers + utilities + ISOs + academia + energy agencies).https://twitter.com/joshdr83/status/1063805446736277504 …
On the coldest days, even "cold climate" ASHP efficiency will descend to that of electric resistance heating.(i.e. COP ~ 1.0) In cold climates, only GHSP should be used since its efficiency is largely independent of outside air temperature.