Yes, I'd say you are absolutely right in that insulation is the most important thing to improve. I'm not familiar with cavity insulation, but I suspect that it'

Yes, I'd say you are absolutely right in that insulation is the most important thing to improve. I'm not familiar with cavity insulation, but I suspect that it's not the best in terms of efficiency. On the other hand different kinds of wall insulation might ruin one's health or one's house, so I'm not really sure what can be done (if anything). My house has something called ETICS* (basically a thick outer layer of polystyrene with a weather resistant paint. Ugly stuff, but it works wonders!), mineral wool insulation in the attic (which I'm supplementing just in case), underfloor insulation with extruded polystyrene and of course double glazed windows. We don't turn on the heat until it's 3 degrees or less outside. Thermostats and stuff like in the article bring too small benefits to really consider. *) https://www.ea-etics.com/etics/about-etics/ https://www.ea-etics.com/etics/about-etics/