Jun 21, 2021 · Self-Contained Air-Cooled Chillers. With chilling capacities from 3.5 to 15.5 tons, the eight-model line of air-cooled chillers has a operating temperature range available of 23 to 77°F (-5 to 25°C). The MRS line is designed for indoor and outdoor applications and can be used in maximum ambient temperatures from 113 to 122°F (45 to 50°C).