The airside energy efficiency market is expanding globally as the need for higher ventilation competes with the need for lower energy costs. The main technologies related to airside energy efficiency for heating, ventilation, and air conditioning (HVAC) are airside economizers and energy recovery ventilation systems (ERVs). Economizers tend to perform best in buildings in mild climates and ERVs tend to save the most energy in cold and humid climates. Building use is also important to the expansion of the markets for these technologies, as heat-intense buildings like data centers benefit greatly from economizers while buildings with many occupants benefit from the preconditioning of ERVs. These markets will grow most rapidly in heavily regulated regions, including North America and Europe. The influence of ASHRAE 90.1 on local building codes will have a profound impact on more universal installations of airside technologies, as well as the energy savings of buildings in general. Other global regions, such as Asia Pacific, will experience growth primarily as cities become denser and the building stock expands. Installing airside energy efficient systems is a relatively inexpensive way to ensure continued savings on energy costs, especially in highly conditioned buildings like data centers. According to Navigant Research, the global airside energy efficient HVAC market is expected to grow from $2.7 billion in 2016 to $4.4 billion in 2025. This Navigant Research report analyzes the global market for airside energy efficient HVAC systems, with a focus on airside economizers and ERVs. The study provides an analysis of the market issues, including drivers and barriers, associated with airside energy efficiency. Global market forecasts for airside economizers and ERVs, broken out by region and building type, extend through 2025. The report also examines the key technologies related to airside energy efficiency, as well as the competitive landscape.