One of the main advantages of a high velocity heating plus cooling method is that it accommodates easily slim spaces. I have an older, historical current home plus was unwilling to compromise integrity by tearing down the original walls. I was also hoping to avoid the mess of of installing big, bulky air duct. A high velocity method uses small, stretchy air ducts that are actually threaded through the walls plus ceiling panels separate from the need to make giant holes. The vents are also easily small in diameter plus incorporate into any room separate from destroying aesthetics. In the past, high velocity systems were harshly noisy. Although air is pushed through the ducts at an accelerated speed, new high velocity systems are designed to provide whisper-quiet performance. There are none of the mechanical fan noises that are often a problem with ductless systems. In the part where I live, there’s super high humidity levels during the summer. A benefit of high velocity a/c is that it is beautifully effective at removing humidity from the air. It defends against moisture-related concerns, such as mold, mildew plus that sticky feeling. Because high velocity heating plus cooling systems use a fifth of the space necessary for a conventional system, there is less surface area, which means less leakage; Drafts plus uneven hot plus cold temperatures are a frequent complaint with traditional central cooling units. With high velocity units, these concerns are avoided. The method maintains ideal temperature by using suction to create a gentle stream of circulating air, created easily even comfort; For retrofit into an older home, a high velocity method provides efficient year round temperature control.