HVAC commissioning is the thorough and comprehensive testing of a building's mechanical system’s performance. Commissioning can reduce operating and maintenance costs, improve the comfort of a building's occupants, and extend the life of equipment. The onetime investment in commissioning can result in major cost savings. According to a report titled “The Cost Effectiveness of Commercial-Buildings Commissioning,” the average operating costs of a commissioned building range from 8 to 20 percent below that of a non-commissioned building. A commissioned facility will provide the owner’s facilities management (FM) staff, handover of a building that operates effectively and efficiently as the design dictates.