Affinity Series gas furnaces offer higher energy efficiency than standard models plus the innovative ClimaTrak Comfort System creates an operating cycle that works best for your locale. Raise your comfort level with our most advanced gas furnace technology. These York units are compact and deliver cooling or heating to structures without installing air handlers and ductwork. The manufacturer considers them a perfect solution for homes without ductwork and for room additions or remodels. Many of the ductless units can be used in commercial applications, especially to condition computer-server rooms where temperatures must be maintained, even in winter when other parts of the building are not being cooled.