The document discusses three main factors that affect body heat loss: temperature, air movement, and relative humidity. It then describes the three main types of heat loss from the body - radiation, convection, and evaporation. The document promotes a radiant heating system called Therma-Ray that provides efficient, consistent heating throughout a room from floor to ceiling. It claims this system is more economical to operate than other heating options like oil, gas or electric forced air. Installation costs and estimated operating costs are provided for sample homes along with benefits of the radiant ceiling and floor warming systems.