Conventional air conditioning units cannot provide cooling when the outdoor temperature is below 20°C (67°F). With Mr. Slim's intelligent fan speed control, the system performs well in cooling mode even when the outdoor temperature is down to - 10°C (14°F).

Mr. Slim outdoor units now have an extended heating range. The MSZ-GE and SEZ models provide heating down to -4° F (-20° C). The MSZ-FE units go even further operating at temperature as low as -13° F (-25° C) continually providing heat on even the coldest of winter days.