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Warm Air Radiant Heat The balance of the radiant heat is reflected from the heating surface to be absorbed by surrounding cool surfaces. A part of the secondary ray energy, now of longer wave length, is absorbed by moisture and particles in the air, which helps to raise the temperature. As a secondary effect, the room temperature is raised by convective transfer from the heated surface. Infra-red rays travel in divergent straight lines from heat source to all surfaces and objects without heating