Introduction
HYPERTENSION
Excess winter mortality (EWM), which refers to the marked increase in mortality rate in winter, is a global problem in public health [Hypertension is called a “silent killer” as it has almost no subjective symptoms [In 2018, the WHO issued the Housing and health guidelines, which focused on “low indoor temperatures and insulation” [Consistent with the above background, we started a nationwide, prospective intervention trial, the “Smart Wellness Housing (SWH) survey” in Japan, to quantitatively evaluate the health effects of indoor temperature and insulation retrofitting of houses.