How can I calculate payback period of different HSPF/COP heat pumps?
(I have an old fireplace insert in the living room that I use on some of the coldest days and for ambiance some evenings. Don’t think it is very efficient but it does heat things up. I normally burn around 2 face cords of wood. I am too lazy to use wood more often.)
GBA Detail Library
A collection of one thousand construction details organized by climate and house part