Seven-campus school district: re-commissioning what's in the ceiling

The buildings

This is a representative scenario built from the kind of district we see across North Mississippi. The numbers are design-stage projections, not measured results.

The district has seven campuses: four elementary schools, two middle schools and a high school, about 720,000 sq ft in total. Over a decade of renovations it collected lighting controls from three manufacturers: wired room controllers with occupancy sensors in most classrooms, a networked system at the high school, daylight sensors in gyms and cafeterias, and astronomical time clocks for the exterior. One middle school’s platform is no longer sold or supported.

On paper, the district already has the controls a modern energy code asks for. In practice, gym lights burn all weekend, classroom sensors are taped over, daylight dimming is disabled in two cafeterias, and the exterior clocks never caught up with daylight saving time. Lighting uses about 1,500 MWh a year.

Constraints

• The work window is summer. Buildings are emptier in June and July, but custodial crews strip and wax floors, and two campuses host summer programs.
• Three platforms, three tools, few passwords. Software versions, licenses and admin credentials are scattered or lost.
• A small maintenance team that covers everything from boilers to bleachers.
• Little capital budget. The plan has to work with the hardware already in the ceilings and replace only what is actually broken.

What we’d do, by phase

Survey (spring). Before summer, we’d run a one-day sample functional test at one middle school: three rooms of each space type, a gym, a cafeteria and the exterior. That day tells us how big the problem is and what kinds of failure to expect everywhere else. We’d also collect drawings, gather the system software, and talk to custodians and a few teachers.

Bench (spring). Bring a controller from each platform into the Lytbit Lab, confirm software and firmware versions, and recover or rebuild the configurations. The orphaned platform gets stabilized this summer and a replacement plan through our legacy migration service, rather than a full re-commissioning it won’t outlive.

Design (spring). Write the District Controls Standard: one sequence of operations per space type, applied to all seven campuses regardless of brand, plus naming conventions, test scripts, and the deliverables every future renovation must hand over. It is the most durable thing this project produces.

Oversee and commission (summer). Functional testing of every space against the standard, on the schedule above. District electricians handle replacements, paired with our technicians so they learn each platform’s tools as they go.

Operate (school year). The district joins our Watch support tier: remote monitoring where the platforms allow it, a quarterly report, and a sample retest each fall after furniture moves and new teachers rearrange rooms.

Projected outcome

Measure	Current operation	Projected
Annual lighting energy	about 1,500 MWh	1,130–1,280 MWh
After-hours lighting runtime	baseline	40–60% lower
Sensors and controllers needing replacement	unknown	5–10%
Campuses on one written standard	none	all seven

Re-commissioning saves less than a new system, but it also costs far less: most of the work is settings, testing and paperwork. Re-commissioning existing controls doesn’t normally trigger the functional-testing requirement new installations face under codes such as the 2024 IECC (section C408.3). We’d test to that level anyway, so the records hold up when a future renovation does trigger it. Which edition applies at that point is something we confirm with the authority having jurisdiction.

What we’d watch out for

• Teacher complaints in August. A vacancy hold time that worked in an empty building can fail when 25 students sit still for a test. We’d set hold times with the school year in mind and retest in the first weeks.
• Overrides creeping back. Gym event modes need timeouts, or one basketball game becomes a permanent setting.
• Testing around children. Summer-program wings get tested last, after they empty.
• Clocks after storms. Exterior clocks without working backup lose time in summer outages, so we’d check astronomical settings and backup batteries on every campus.

What we’d do differently next time

We’d run the spring sample test earlier, ideally in March, so the district’s budget request reflects real failure rates rather than our estimate. And we’d train district electricians during testing, not after it. Someone who has re-aimed twenty sensors alongside a technician understands the standard better than anyone who sat through a slide deck.