Duct-Free Split Systems Kingsport Heating & Air conditioning can also provide help for homes with no ductwork. When using window air conditioners or no air conditioning at all, duct-free splits (also known as mini-splits) offer a QUIET, efficient & safe alternative. Multi-Split Duct-Free Split Systems Quietly cool and heat up to four rooms using one outdoor unit and no ductwork. Carrier Xpower multi-split duct-free split systems deliver quiet comfort in multiple rooms (up to four) without installing ductwork and with only one outdoor unit. These units are extremely quiet, controlled with an infrared remote control. High-Wall Duct-Free Split Systems Mounted on a small amount of wall space near the ceiling, these products fit seamlessly into nearly any decor. Comfort levels can be easily and precisely controlled using the infrared remote control. The duct-free high wall systems, often called ductless high walls or mini splits, are also a quiet and efficient alternative to window air conditioners.