Cx Associates commissioned energy efficiency improvements at Burlington International Airport including the upgraded central chilled water system, replacement of two inefficient constant volume dual duct air distribution systems with a VAV system, extensive controls system programming upgrades, and lighting efficiency upgrades. CxA conducted design review for the central cooling plant and air system and heating plant upgrades. Many of our design review comments had a positive impact on system performance, especially part load operational efficiency. We estimate that our design review of the chiller plant controls alone saved the airport 150,000 kWh/year (20% of full load), worth $19,000/year. In addition, CxA worked with BTV to implement Building Performance Metrics and Monitoring to enable the building operators to maintain system performance over time.