■How much do you think about insulation performance when building a custom home? Have you ever moved into a home and felt that it was hot in summer and cold in winter? Insulation performance, which has a major impact on daily comfort and utility costs, is actually one of the points often overlooked when building a home. In recent years, it has attracted more attention due to revisions to insulation grade standards and growing awareness of energy savings. NEXER Inc. and Tsuchiya Home Co., Ltd. therefore conducted a survey on awareness of insulation performance in custom homes, targeting 150 men and women across Japan who had answered in a preliminary survey that they had built a custom home. Survey overview: The survey was conducted online from March 2 to March 9, 2026. Respondents were men and women across Japan who had previously answered that they had built a custom home. The number of valid responses was 150. ■66.0% said they prioritized insulation performance The survey first asked how much respondents prioritized insulation performance when building their homes. The results showed that 23.3% said they “prioritized it very much,” while 42.7% said they “somewhat prioritized it.” Combined, 66.0% prioritized insulation performance. On the other hand, 27.3% said they “did not prioritize it much,” and 6.7% said they “did not prioritize it at all,” suggesting that about one in three people did not pay much attention to insulation performance. Reasons for prioritizing insulation included: “It affects running costs,” “It saves energy and lowers electricity bills,” “Air conditioning and heating work better, leading to energy savings,” “To live healthily,” and “It affects utility costs during winter.” Reasons for not prioritizing insulation included: “It was not a topic of discussion when I built my home,” “The term ‘insulated home’ did not exist 35 years ago,” “I was young and lacked knowledge,” “I was focused on staying within budget and could not think that far,” and “