Abstract: A space heating device which utilizes infrared lamps has enhanced heat transfer, and achieves an air flow velocity increase of approximately 30 percent, resulting in increased efficiency. A heat exchanger comprising a plurality of spaced, parallel copper tubes, and a plurality of spaced, parallel aluminum fins connected and extending perpendicular to the tubes, is mounted above the infrared lamps and in an air flow path within a casing so that air is circulated by a fan from a cool air inlet, past the lamps, beneath, around, and above the heat exchanger, through the tubes of the heat exchanger, and through the spaces between the fins and tubes, to the heated air outlet. Bottom portions of the fins are coated with black carbon paint to enhance heat transfer, and curved deflectors are provided adjacent the bottom of the lamps and adjacent the top of the heat exchanger on one end thereof, to facilitate guiding of the air in a generally S-shaped path through the casing.