Although more efficient or higher energy star rating houses may experience less absolute changes in energy requirement due to changing climate, they appear to have greater percentage changes in H / C energy demand, especially in regions with a H / C balanced temperate climate such as in Sydney where the increase is projected to be up to 120 % and 530 % for high star rating houses when the
global temperature increases 2 °C and 5 °C
respectively, potentially posing significant pressures on the
capacity of local energy supply