Air cooling suits compact, mobile stations, refrigerant cooling suits shops that run hot, and water cooling suits the highest power and longest duty cycles. Air-cooled handheld welders generally top out around 1,500 W because of heat management. Bodor's refrigerant-cooled Pro 1500 is rated from −20 to 60 °C ambient, a higher upper limit than the Air 1200, while the water-cooled Aqu 3000 adds a chiller loop that needs distilled water, service access, and freeze protection in unheated buildings. Match the cooling to your shop's temperature and duty cycle, not just the wattage.