Florida Test and Balance Services, Building System Commissioning and Building Air Barrier Testing. Southern Independent Testing Agency, Inc. (SITA) and SITACx providing High Performance Building Testing 35 Years of Excellence •HVAC Testing, Adjusting & Balancing (TAB) •Building Commissioning •Indoor Air Quality measurements (IAQ) •Blower Door Testing SITA was incorporated in 1980 in the State of Florida, with our headquarters located just north of Tampa, FL. We provide our customers with one of the most respected, certified staffs, utilizing the latest instrumentation in the industry to evaluate buildings and mechanical systems to improve occupant comfort while promoting energy efficiency.