Abstract: Apparatus is provided herein for inhalation rewarming for the treatment of victims of hypothermia. The apparatus includes a water reservoir. A steam chamber communicates with ambient air. A heater means is associated with such water chamber, for the generation of steam into such steam chamber. An opening is provided admitting air to the steam chamber, thereby to provide an air-steam mixture. A first conductor is connected to the steam chamber for the conducting of the air-steam mixture from the steam chamber in a first direction. A valve is provided in the first conductor for varying the inflow of the ambient air while simultaneously reciprocally varying the inflow of the air-steam mixture and providing a substantially constant volume flow into the first conduit means. The valve includes actuated operator means for initially introducing sufficient ambient air into the air-steam mixture in the first conductor means to provide a continuous flow of the water-saturated air at the temperature of about 35.degree.