Abstract: A system for heating and cooling external roof and wall surfaces of existing building structures incorporated in supplementary building construction to be added to the roof and/or external walls of an existing building structure wherein the supplementary construction added to the building structure serves to selectively create air flow over external surfaces of the building or alternately trap air in a substantially closed air space chamber wherein it is subjected to heat absorption from an external panel or structure exposed to the sun's radiant energy. The construction of the present invention is specifically structured and configured to take advantage of naturally occurring pheonomenon such as solar radiation, movement of air currents through convection and the capturing of naturally forced air such as wind.