Most people live in houses with poor insulation and ventilation, because they either don't used to live in a hot climate or have air-conditioning. We don't bui

Most people live in houses with poor insulation and ventilation, because they either don't used to live in a hot climate or have air-conditioning. We don't build smarter because air-conditioning is cheaper, but a lot of people can't afford neither, and they are becoming necessary to have.