Which organization developed the latest whole building test method for air tightness?

The organization that developed the latest whole building test method for air tightness is the Air Barrier Association of America (ABAA). Their primary mission is to promote and provide education regarding the importance of air barrier systems and their contribution to energy efficiency and building performance. They establish standards and provide guidelines that help in evaluating and testing air barriers, including the latest methodologies for assessing whole building air tightness.

This focus on creating effective testing methods is essential because air leaks can significantly impact heating and cooling costs, indoor air quality, and overall building durability. The ABAA's involvement in developing these testing standards underscores their expertise and leadership in the field of air barrier technology.

Other organizations mentioned have different focuses; for instance, ASHRAE primarily deals with heating, refrigerating, and air-conditioning engineering; USACE focuses on military and civil engineering projects; and NFPA is involved in fire protection and safety standards. Their contributions, while essential in their respective areas, do not currently address the specific development of air tightness testing methods in the same way ABAA does.