Whether you are designing new constructions or deep energy retrofits, the basis for an energy efficient design is an understanding of the climate that you are working in. Local climate has has always been one of the main factors shaping vernacular architectural design throughout the world, and, ultimately, the goal of any building is to protect the occupant from external climate factors. Therefore, an effective thermal envelope of a building should bridge the gap between the desired health and comfort conditions for the occupants and external weather conditions.