Listening to and respecting the O&M staff — whether they are building owner employees or outsourced service contractors — is a retrocommissioning best practice. In many cases, it is a necessity for successful retrocommissioning.
Even without engaging the O&M staff in the retrocommissioning process, they are critical to success. Any modifications made to the systems need to be understood and maintained by O&M personnel in order for the benefits of retrocommissioning to persist beyond the first week or two after the retrocommissioning engineers leave the building.