Eight facts about air conditioning amid an overheated global debate (carbonbrief.org)

It's already very common, you virtually always need one to pass energy source regulations for new builds, that or solar panels to offset fossil energy on paper.

Large majority of ACs sold in the EU are air-to-air heat pumps.

In the Nordic’s heap pumps are very common, approximately 48, 52 and 63 % of households in Sweden, Finland and Norway have heat pumps installed. [1]

[1] : https://ehpa.org/news-and-resources/press-releases/heat-pump...