PURPOSE: To carry out the collection of heat of a hot wind created by heat of the sun, by comprising a gable roof to heave a heat exchanger housed within the ridge on the roof top, a hot wind ascending path in a roofing material facing the south, and a hot wind descending path in a roofing material facing the north.

CONSTITUTION: A roofing 3 is laid through a heat insulation 2 on a batten 1 of the roof, and ribs 4 are attached on the roofing 3 in a prescribed spaced pattern. A flat metal plate 5 is laid to cover the ribs 4 and the roofing 3, and thereon formed tiles 6 of stainless steel are laid along the ribs 4. Respective spaces between the metal plate 5 and the formed tiles 6 are communicative toward the top to form a hot wind ascending path A in the roof facing the south and a hot wind descending path B in the roof facing the north. A ridge 7 on top of the roof consists of formed tiles 8, the inner side of the ridge 7 is covered with an insulation 9, and within the ridge 7 is housed a heat exchanger C having a water pipe 11 and a plurality of fins thereon to carry out heat exchanger of a hot wind.