A structure for housing plants and animals, particularly poultry, in a controlled environment, comprises a base and opposite sides inclined towards an apex at which there is provided an opening. A ceiling is provided inside the structure over the plants or animals. The ceiling is opened to allow hot air trapped below it to pass out through the opening in the apex, thereby cooling the interior. To heat the interior, the ceiling is closed to retain the heat generated by the plants or animals as well as solar generated heat. Vents are preferably provided in the sides of the structure to allow cooling air to be drawn in when the ceiling is opened.