Since the late 1970s, indoor air quality (IAQ) has been increasingly recognized as having a direct effect on the health and well-being of building occupants. Recently, the impact of HVAC systems in the fight against airborne virus transmission has generated a renewed focus on air quality. However, with the introduction of fresh air, improved filtration, humidity control, and other air treatment methods comes a growing concern about the potential for higher system loads – and the increased energy use that can result. Fortunately, the proper application of modern HVAC technologies can help maximize indoor air quality while minimizing losses in operational efficiency.