Designed for versatility and year-round comfort, the 38MAR achieves full heating capacity even as temperatures outside dip to 5° F (with the right combination of model size and matched indoor unit). This quiet, compact heat pump pairs with a variety of indoor units for a budget-friendly and flexible solution to your duct-challenged comfort needs. Part of our PerformanceTM Series, this model really delivers with features like variable speed operation for extra efficiency and reduced sound.