+ it adds to the cost of new developments in the countries where its mandatory a high efficiency rating, like Ireland BER https://www.seai.ie/home-energy/build

+ it adds to the cost of new developments in the countries where its mandatory a high efficiency rating, like Ireland BER https://www.seai.ie/home-energy/building-energy-rating-ber/ https://www.seai.ie/home-energy/building-energy-rating-ber/ https://www.gov.ie/en/publication/1ca53-new-energy-efficiency-standards-for-new-dwellings/ https://www.gov.ie/en/publication/1ca53-new-energy-efficienc... By the way there's talk from some gov officials to forbid selling old houses if the BER rating is too low. You will need to spend thousands to get it to some better rating.