Hood Patterson and Dewar

TMCx Solutions is a professional engineering firm specialising in independent third-party commissioning, with an office at Mesa, Arizona. It provided Level 5 integrated systems commissioning on the SRP-MIC IT data centre in Scottsdale, covering mechanical HVAC, electrical and fire protection systems, and enhanced commissioning on the Gila River Indian Community data centre in Phoenix. Its portfolio also lists critical facilities work for other data centre owners.

GAI Consultants runs a data centre and mission-critical facility commissioning programme organised into levels that parallel the project delivery lifecycle, from design through operations handover. Its published scope covers factory witness testing at the supplier's plant, load bank testing of generators and UPS at rated load, and integrated systems testing that simulates utility loss, generator failure, UPS failure and chiller failure. It serves the Phoenix market from an office in Tempe, Arizona.

Engineering Economics, Inc. is an independent building commissioning firm whose mission-critical practice commissions data centres through a levelled process running from design review at Level 0 to transition to the facilities team at Level 6. Named steps include factory test scripts, witnessing equipment startups, functional performance tests, integrated systems test scripts and testing of redundancy and failover under simulated failure scenarios. It holds an office in Phoenix, Arizona.