This article explores the insulation of traditional and modern Japanese homes, as well as government incentives for homeowners to install insulation. Traditional Japanese homes were built with insulation in mind using wood panels filled with clay, straw, and paper, while modern techniques include fiberglass batts, foam board installation methods such as spray foam or rigid boards, and reflective foil barriers for walls and roofs. Advantages of insulation include energy efficiency and reduced noise levels inside the home, while disadvantages include cost of installation and maintenance. According to Charles R. Tokoyama, CEO of Japan Insiders, Japanese houses are generally very well insulated due to high quality materials combined with advanced building techniques.