A roof system (500) with a roof (504) formed of a plurality of rafters (508). Each rafter has side surfaces thereby forming a plurality of openings. A plurality of rectilinear panels (506) with at least a portion of its volume within an associated opening (510). Each panel has upper and lower surfaces with an upper sheet of reflective foil (514) secured to the upper surface of each panel and a lower sheet (516) of reflective foil secured to the lower surface of each panel.
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