A 7-star NatHERS rating is often seen as the finish line for an energy-efficient home. It is a solid benchmark, but on its own it does not always mean lower energy bills. NatHERS measures thermal performance on a 0–10 scale, based on design, construction, and local climate. In general, higher star ratings mean less heating and cooling is needed to stay comfortable. Visit : https://www.domesticdraftingservice.com.au/post/beyond-the-7-star-rating-how-smart-drafting-lowers-your-energy-bills