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Japan has abundant hot springs which are used to heat spas in hotels.Used hot water from a spa is mostly drained into rivers.The temperature of the used hot water is approximately 30℃, and has the potential to warm the enclosed places.Surplus heat emerges from machinery rooms which control the environment in the spa.The present experiment was carried out in Yubari City, Hokkaido, 470 m above sea level which has 2 m of snow cover in the winter.A small plastic house with 4 cultural beds (0.9 mW x 6.3 mL x 0.6 mH) was built close to the spa area.