Abstract: The system and method to maintain the temperature inside a building or house within comfort levels independently of the Grid. The system has a collector; an accumulator; and a transformer, which is the building or house. The method consists of transforming energy from solar radiation into thermal energy, accumulating that energy into an accumulator, and using that accumulated thermal energy to warm the internal environment of buildings or houses. One of its loops functions between dawn and sunset and includes only the collector and the accumulator; its second loop includes only the accumulator and the transformer and operates primarily between sunset and dawn. The collector uses a blackened surface to transform sun's radiation into thermal energy to warm air that is used to conduct the thermal energy throughout the system. The system can be built with inexpensive material; utilized in significantly isolated areas; and constructed and assembled on site.