 Traditional Japanese buildings do not use insulation, and insulation may even be omitted in modern construction, especially in the low-end apartments; nor is insulated glazing traditionally used in windows, with these being generally single-pane.This is not the case in Hokkaido and the northern part of Honshū, due to the cold winters there.Insulated and centrally heated homes in the northern part of Japan are warmer than many homes in warmer parts of Japan and often use double-pane glass.