Cladding sheets (9), such as roof or wall cladding sheets, include mounting sections (21) for mounting solar panels (35) on the sheets and support sections (23) for supporting the mounting sections of other cladding sheets. A roof or a wall of a building formed from the cladding sheets includes air flow ducts (27) extending along the length of the cladding sheets and underlying the mounting sections in heat transfer relationship with the mounting sections for heating or cooling air flowing through the ducts. A system for generating electrical energy and thermal energy from solar energy converts solar energy incident on solar panels on the roof or the wall into electrical energy and thermal energy and converts solar energy that is otherwise incident on the roof or wall into thermal energy. An integrated heating and cooling system for a building collects and transfers air that has been heated or cooled by the roof or the wall as it flows through the air flow ducts of the roof or the wall and uses the heated or cooled air as a source of thermal energy in the building.
