The invention provides energy-saving housing wherein the indoor temperature condition can be made comfortable throughout the year by a small amount of energy by suppressing loads on cooling and heating devices, and high airtightness and high heat insulation performance can be maintained for a long period of time so that durability is excellent. The vertical metallic stack is annealed at an elevated temperature to induce formation of a TiAl3 liner by reaction of the Ti liner with the material of the aluminum portion. The opening may be defined by a first edge, a second edge opposite the first edge, a first side edge, and a second side edge opposite the first side edge.