A ventilating system for a bed for selectively venting either ambient air or heated air into the bed linen of a bed approximate the foot of the bed through a pair of vents clipped to the mattress in spaced apart fashion. with a pliable partition longitudinally extending the length of the top and bottom sheet and fastened therebetween creating a pair of side by side chambers with each having its own vent in conduit communication with the ventilator unit incorporating a heater and a fan working independently of each other so that one can select either ambient air or heated air and the volume of desired air through settings such as low, medium or high volume.