Abstract: One or more ducts conduct hot air from a central heating plant to a baseboard distribution system in a room or other space to be heated. The baseboard unit forms an enclosed space through which a conduit extends longitudinally at approximately the horizontal centerline. The conduit and baseboard each include a plurality of laterally spaced openings through which heat may escape, those in the baseboard being at or near floor level, whereby the hot air escaping from the conduit fills the upper portion of the baseboard enclosure before passing through the lower level openings into the room. The baseboard enclosure thus serves as a reservoir for hot air, avoiding abrupt changes in temperature usually associated with forced hot air heating systems.