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Invisible, clean, silent, maintenance- free, extremely comfortable. Radiant heat. The name itself evokes feelings of cozy warmth. Technically, the term refers to a method of heat distribution in which a hot "radiator" warms people, objects, and spaces through long-wave infrared heat transfer. Radiant heating systems come in many forms, ranging from superhigh- temperature gas panels used in factories, to low-temperature radiant floors and ceilings in houses. Within that last category, there are a variety of systems, each with slightly different design constraints and applications. For example, ceilings warmed to 110°F generally feel good to people below, but a floor at 110°F would feel too hot — like a practice mat for walking on hot coals. For rapid response, only "high temperature" radiant ceiling panels