John McGahon (Fine Gael) | Oireachtas source

That leads me on to my other question. How much on average can an individual expect to save on energy costs for their home in a year, after an average retrofit, where he or she, perhaps, has cavity walls and attic insulation done? I am aware that there are many different ways of doing this and it depends on what one gets which I understand, but can Dr. Byrne give an average example where I have had a retrofit done, on what I expect to save, please?