# Japan residential heat safety and climate control > Developing situation record from CLSTR: https://clstr.news/situations/japan-residential-heat-safety-and-climate-control > Updated: 2026-10-26T04:30:36.000Z. Sources: 2. Developments: 2. Health and energy experts in Japan have issued warnings regarding heatstroke risks, noting that over 100,000 people were transported by ambulance due to heatstroke between May and September 2025, with a majority being aged 65 or older. Officials advise against avoiding air conditioning to save on electricity, as seniors may not effectively perceive heat, increasing indoor risks. Experts also emphasize that regular air conditioner maintenance, such as cleaning filters, is essential to prevent significant increases in electricity costs and maintain efficiency. In response to temperature fluctuations and health risks like heat shock, residential renovation trends are shifting toward improved climate control. In the Miyagi Prefecture and Sendai regions, specialists are promoting whole-house air conditioning systems to manage humidity and air quality. Renovation services are also focusing on high-performance insulation upgrades and the revitalization of older homes to better mitigate seasonal temperature swings. ## Timeline ### 2026-10-26: Home renovation and climate control trends in Japan Home renovation and whole-house air conditioning services in Japan are focusing on climate control, energy efficiency, and revitalizing older properties through specialized craftsmanship. 2 sources. https://clstr.news/cluster/home-renovation-and-climate-control-trends-in-japan ### 2026-09-28: Japan heatstroke risks and air conditioner efficiency Experts warn that avoiding air conditioning to save money increases heatstroke risks for seniors and recommends regular filter maintenance to prevent significant increases in electricity bills. 2 sources. https://clstr.news/cluster/japan-heatstroke-risks-and-air-conditioner-efficiency --- Cite as: Japan residential heat safety and climate control. CLSTR, https://clstr.news/situations/japan-residential-heat-safety-and-climate-control