Abstract: A dual purpose Venetian blind for assisting in cooling and/or heating an adjacent room by providing slats with one side having a heat absorbing surface and the opposite side having a heat reflecting surface. The blind slats are selectively moveable to present the reflective or absorbing side to the outside and either reflect light and heat or absorb the light and heat. Thus, a room with such a blind can have temperature control assisted by positioning the reflective facing the outside during the summer to reflect heat and the dark side facing out during the winter to absorb heat energy from the sun.