Balancing the energy efficiency and ventilation needs of a high-performing building is one of the most challenging aspects a design team faces. Ventilation Standards (ASHRAE, mechanical codes, LEED, WELL) have evolved to allow building designers/engineers the opportunity to achieve both IAQ and energy efficiency by allowing performance-based approaches. Sorbent-based air cleaning technologies have similarly developed to the point that they may be used in conjunction with these standards to provide comfortable indoor environments while continuing to conserve energy. By cleaning indoor air of contaminants and applying the IAQ Procedure (IAQP) of ASHRAE Standard 62.1, required outside ventilation rates can be decreased. Outside air reduction results in operational and capital energy savings. The investment in gaseous air filtration is offset by avoiding unnecessary additional investments in HVAC equipment that would be required using the more commonly applied Ventilation Rate Procedure (VRP). This paper covers a real-world case study - how an Event Center (LEED Building) in Tennessee designed a high-efficiency geothermal event center, overcoming cooling capacity limitations while at the same time providing acceptable indoor air quality.