AN APPLIED STUDY OF THE UPGRADING OF THERMAL INSULATION AND WINTER THERMAL COMFORT IN DETACHED HOUSING IN HOKKAIDO

The thermal insulation, heating, and ventilation systems of four typical existing detached houses were upgraded to meet current building standards, Air leakage was reduced to 2 cm^2 per 1 m^2 of floor area and the hygrothermal condition of the crawl space of the vertical edge insulation of the foundation walls was also improved. Thermal comfort in the living areas of the houses and their internal temperature distribution were brought up to Sapporo\u27s new energy conservation code levels, The cost of each upgrading, excluding heating equipment, was found to be approximately 6 million yen per house