A Building Performance Institute (BPI) Building Analyst (Energy Auditor) has gone through a rigorous, credible training program. A Building Analyst knows how to apply house-as-a-system techniques in upgrading the performance of homes; that is, improving the home’s energy usage, durability, health, comfort, and safety. By applying house-as-a-system techniques, problems are identified and fixes proposed that will not create problems for other systems in the house.
The above paragraph is quoted from BPI documents. For more information, please visit the BPI website.