Abstract: A solar heating siding panel adapted to be mounted on the side of a building in a vertical position which includes on the outside double panes of clear glass secured in a housing horizontally spaced outwardly of the building. Inwardly of the housing is located a heat collector closed on the inside by a heat exchanger of substantially thin foil material and spaced inwardly of the glass panes. The collector confines dead air to be solar heated through the glass panels. The heat exchanger has a dull color on the inside and a bright surface on the building side. A longitudinal passage extends within the panel between the bright foil inner wall of the heat exchanger and a second bright thin foil abutting the sheathing or outer structural wall of the building. There are lower and upper passages leading from the longitudinal passageway into the lower and upper portions of a room in the building to be heated.