Abstract: An air-to-air heat exchanging solar heater consists of at least one panel having a frame surrounding a mounting plate. At least one column of recycled aluminum cans consisting of about 17 cans stacked end to end. Each respective can has its top removed (thus having an open top) and the bottom wall having a plurality of holes, preferably four to eight holes ¾? in diameter. A baffled air column is therefore defined by the end-to-end stacked cans. A low power fan draws air through the column. Preferably, the at least one panel includes 17 columns of 17 cans and the entire assembly (except for the clear panel) is painted black with a high-temperature paint. The at least one panel includes hardware to create an air passage to an existing heating system and draws fresh air from outside.