Comment by rcxdude

Heat pumps have gotten a lot better, you need a pretty extreme climate for them to start to struggle, even the air-source ones.

(And PV works well enough in the UK for it to be a no-brainer to put on residentials roofs, which is on the whole the most expensive way to deploy it. Though this is in large part due to the way that it competes with retail prices and not wholesale prices)