Ductless air conditioning and heating systems are gaining a lot of ground in the HVAC industry, and with good reason. They're efficient. In some cases, the efficiency is beyond anything that a traditional split unit can offer. They're convenient. You don't need a network of traditional ducts to have a whole-house system. And they give you control. Ductless systems can fit almost anywhere you want, even in a corner of a room that's never been comfortable.