We have proposed ice-making equipment which absorbs cold thermal energy from outside winter air. In this report, we show the characteristics of the equipment, such as ice-production and heat transfer abilities at steady temperatures. Under conditions of outside temperature of -8.6-- 12.0 degrees C and refrigerant flow rate of 14.4-15.6 L/min, ice production rate is 15.5-16.9 kg/h and COP is 1.70-1.86.