... :ORGREN air cooler series is suitable for high,middle,low temprature(+5°C— -25°C)1.light in weight,convenient intallation,compact structure ... evaporator: air cooler series is suitable for high,middle,low temprature(+5°C— -25°C)1.light in weight,convenient intallation,compact structure ... heat performance: 8 hours defrost cycle. Roof installation dual discharge air cooler for cold storage