The star band rating that can be achieved is 0 – 10 stars. A 10 star home theoretically requires no energy to heat or cool the dwelling and is comfortable all year round. As you can imagine, a 10-star rating house minimises the cost of running your home. A 0 star home is the opposite and provides no thermal protection to the outside environment. A home with a low energy rating requires significant costs to keep it warm in winter and cool in summer.