ASHRAE Standard 62.1-2013 provides two alternative procedures for selecting the minimum ventilation rate for commercial buildings: the prescriptive Ventilation Rate Procedure (VRP); and the rarely used performance-based Indoor Air Quality Procedure (IAQP). The IAQP allows lower ventilation rates than the VRP and, at a minimum, maintains the same indoor air quality, providing additional contaminant reduction strategies are applied. This paper provides examples, benefits and lessons learned from applying IAQP in various commercial buildings located in a variety of climates.