This article explores the various methods used by Japanese homeowners to keep their homes warm during winter months. Traditional building materials such as wood, straw, mud and clay are commonly used in construction to help insulate against heat loss and increase energy efficiency. Additionally, techniques such as shouji walls, thick tatami mats on floors and walls, and charcoal braziers all help trap heat inside the home. Modern solutions such as electric space heaters, air conditioners with built-in heating functions, gas-powered kotatsu tables, wood-burning stoves, underfloor heating systems, and solar panels are also utilized. Double glazed windows are also installed to provide additional insulation while still allowing natural light into the room.