Yes, this issue concerns me greatly, especially after the increase in bills. I started looking not only at heating, but also at how the house behaves in summer. While searching for useful information, I came across https://www.tintfit.com/shop/ , where they talk a lot about reducing heat loss through windows. This made me look at energy efficiency in the UK in a different way. It turns out that controlling solar heat is just as important as insulation. The site left an impression of being a practical resource for those who are really thinking about long-term savings.
