The following submission statement was provided by /u/DisasterousGiraffe:

"In Europe, heat pumps enjoyed a record year, with sales growing by nearly 40%. In particular, sales of air-to-water models, which are compatible with typical radiators and underfloor heating systems, jumped by almost 50% in Europe. In the United States, heat pump purchases exceeded those of gas furnaces."

Please reply to OP's comment here: https://old.reddit.com/r/Futurology/comments/127nr2k/heat_pumps_could_supply_20_of_building_heating_by/jeexlmi/