The manner in which ducted HVAC systems control and supply conditioned ventilation air into spaces leaves substantial room for improvement. Typical conditioning control is determined by the set-point temperature of a thermostat. Accordingly, in our calculations a single temperature throughout the space vertically and horizontally is anticipated, but rarely ever occurs. Yet, the entire HVAC industry makes daily decisions for equipment specification based upon this critical assumption. A dramatic paradigm shift, debunking much of our established understanding of how forced mechanical air conditioning operates in a space, is introduced here. Through the measurement of external air pressure, air duct, and room pressure as well as supply air velocity and air temperature, a new control system has emerged. This control system yields a low air velocity in comparison to conventional system operation. The intention here is to begin to understand the phenomenon behind of what we call a balanced pressure low velocity (BPLV) control system. This control offers a significant reduction in supply and return air fan speeds. It is ideal for large open spaces, such as department stores, offices, swimming pools, etc. The control phenomenon results in no air temperature stratification within the space (even up to10m height). It is even noticed that heat transfer on the interior glass envelope is also dramatically reduced. All of this occurs at air velocities reduced 400% or more and at a substantially lower room air pressure than conventional systems. This report is only a beginning to investigating and clarifying the BPLV phenomenon.