everybody already knows it takes more energy to heat something as it gets colder and colder outside dude. and you still don't understand the difference between relative efficiency and absolute efficiency, you keep mixing them up, and then on top you that you mention absolute costs when i specifically called out the difference in the previous post.

when you talk about your gas boiler vs your heat pump, what does it cost you, in terms of dollars, to get 1 degree of rise out of each? post that, along with the manual j for the respective heating zones, and then we can start to get a rough idea of what is more efficient in terms of absolute costs. until then, you're just talking out of your ass