Abstract: A method is disclosed for installing heat transfer panels (typically of metal) on a roof. Panels are applied to the roof such that the panels have an interlocking relationship at interlocking interfaces between adjacent panels. An energy conducting element is laid among the panels such that the energy conducting element extends along the interlocking interfaces such that of the energy conducting element emits heat in all directions, preferably by contact 42 heat exchange panels. A roofing material is then applied over the panels and energy conducting element. The panels each have a first interlocking member positioned along one first lateral side and a second interlocking member positioned along a second lateral side. The second interlocking member is sized to receive the first interlocking member of an adjacent panel and a portion of the energy conducting element.