E Cube’s approach to retro-commissioning utilizes a 4-stage process starting with an initial site assessment to evaluate existing facility conditions, operational issues and potential for improvements. This is followed by a detailed technical analysis of issues identified during the assessment stage and recommendations for improving system operation. The next phase consists of overseeing installation of recommended system upgrades, functional commissioning, tuning and verification of system operation. The last, and most important phase, is the monitoring and verification of the systems modified. This last phase is the keystone to any existing building project, ensuring continuous improvement and refinement of system upgrades.