Should I spend a quarter of the value of my home to reduce its carbon footprint?

I want to replace windows and add insulation, but I'm not sure if it makes economic senseQ Should I spend the equivalent of a quarter of the value of my home to reduce its carbon footprint?This cost would replace windows and add insulation and cladding. It should keep the heating bills down - it already has a ground source heat pump. I intend to live in the house for at least the next five years. I can afford it but does it make economic sense?JK Continue reading...