 At the same time, as incomes rise, there is a strong tendency to introduce cooling and heating systems.If we recognize and reward passive design features that improve thermal comfort today, we diminish the risk of having to install HVAC systems in the future, or we at least ensure that such systems will be smaller and less frequently used.Or in case the heating or cooling system is not installed due to high cost, at least people should not suffer from discomfort indoors.