VTAC vs PTAC: Which HVAC System is Right for You? Understanding the Differences: VTAC and PTAC Variable Refrigerant Flow (VRF) technology has revolutionized the field of heating, ventilation, and air conditioning (HVAC). Within the VRF domain, there are two popular types of HVAC systems often used in commercial buildings – VTAC (Vertical Terminal Air Conditioners) […]