This is one time I think every distro should do it a totally different way.
If you go to a Ford dealer, the salesman isn't going to recommend a Porsche. If you go to Taco Bell, they're not going to recommend Wendy's.
Lots of folks have experience installing gas furnaces. That's what they know. They don't know heat pumps. They could learn, but learning is hard. If they can keep selling gas furnaces, that's easier.
My home is made with cement blocks - just like most houses in the UK. It's a massive thermal mass.
I installed heat recovery ventilation which also helps hold heat in while maintaining a constant supply of fresh air.
Which means that temperature swings outside don't really affect me.
"The following is not for the weak of heart or Fundamentalists." -- Dave Barry