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Heat pumps sold so fast in Maine, the state just upped its target
(www.canarymedia.com)
This is a most excellent place for technology news and articles.
Though most heat pumps are also air-conditioners. All it takes is a 4 way refrigerant redirection valve manifold. Heat pumps don't just advertise it as headliner, since the main point is energy savings in the heating. One doesn't get energy savings in the cooling. When switched to cooling, its just an air-conditioner. Same old power hungry airconditioner.
Heat pumps just list in the side sentence "oh you can also run this heat pump in cooling mode in addition to heating mode. Note: the inefficient energy use, when being run in cooling mode."