So what do I know about heat pumps. Not very much and its probably all wrong. Here is a back of a postage stamp summary of my current little knowledge thinking.
I could go away and do a bit more research and I probably will, but give me an armchair ride with your own thoughts to get us started.This is a heat pump
Heat pump installations are ridiculously and unnecessarily expensive.
I've seen some heat pumps they are just a small cabinet not a lot bigger than a gas boiler which sits outside the building with the minimum of pipework and electrical connection entering the house.
They are a glorified fridge in reverse, not really any cutting edge technology
I can't believe the components in those cabinets are any more complicated, or any more expensive materials wise than a gas boiler.
I suspect the pricing of them is inflated by unnecessary subsidies for installations.
I will regard the thread as a success with a single response, a page or two would be brilliant.How do they work
Why are they currently so expensive
DIY could you make one in your shed what components would you need
Words are good, pictures, pen and pencil drawings better
Join in if you can