PHI Service Agency specializes in NEBB & AABC certified: * Testing, Adjusting, and Balancing of Air and Hydronic Systems * Sound & Vibration Testing * Building Systems Commissioning PHI Service Agency, Inc. has been performing independent certified testing, adjusting and balancing of HVAC systems since 1982. We began as a two-man operation with one office in San Antonio, Texas. Over the last 20 years we have grown into a firm consisting of over 40 employees and 4 offices statewide. Our home office remains in San Antonio, Texas while our satellite offices are located in Austin, Corpus Christi, and the Rio Grande Valley (Alamo, Texas).