Central air conditioning systems, whether traditional or high velocity, are known as split systems because the system is split as one indoor unit (usually a coil or air handler) and one outdoor unit (usually an air conditioner or heat pump)— connected by refrigeration lines and control wiring with a condensate drain. The indoor system connects to a central ducting system and, through the use of a fan, distributes the conditioned air to each room through floor, wall, or ceiling registers. Since forced air systems are the preferred system for most new construction homes, central air is the most common system found cooling homes in the area— although ductless systems are trending in popularity. Like any forced air system, the quality of your air is dependent on the design and installation of your duct system. Since air conditioning systems actually cool your house by removing heat in your space, you must not overlook your return ductwork. It is critical, then, to capture the heat load properly to keep you cool on the hottest days.