Tustin Unified School District: HVAC & refrigeration bid work guide

A mix of vintages inside one district

In a mixed-vintage district the mistake to avoid is treating every campus alike. We sort buildings into rough eras and ask different questions of each.

A district with this mix benefits more from a unifying data layer than from any individual repair. When a maintenance supervisor can see all units, their age, their last service and their repeat-failure history in one place, replacement planning stops being a guessing game.

Why the asset record matters more here

The DaVinci Portal gives each serviced unit a QR-coded record: location, model and serial information, readings, photos and service history. In a mixed district it does something specific: it lets staff compare an old rooftop unit and a recent one on the same footing, and it surfaces repeat failures that would otherwise be hidden across different technicians and service providers. The DaVinci Portal page shows what a record contains.

• Which units have been repaired more than once in a short period?
• Which units are past the typical service life for their type and exposure?
• Which campuses have equipment with warranty obligations?
• Which sites have controls that nobody has verified since installation?

How districts with mixed portfolios buy work

California school districts follow public-contracting law: competitive bidding for projects above statutory thresholds, informal solicitations below them, and standing arrangements for recurring work, which may be on-call agreements, cooperative contracts or job-order contracts. Mid-sized districts often keep their own maintenance staff and bring in outside firms for specialized diagnostics and projects. The district's policies decide, and they change; confirm current requirements with the agency.

Start with the purchasing and facilities pages and any hosted bidding portal. A district with campuses in several municipalities may also have permitting touchpoints with more than one city for non-DSA work, such as site utilities or off-campus staging; ask the district's project manager. Compare with Irvine Unified and Santa Ana Unified, which neighbor this district, and read the procurement guide.

Timing work against the school calendar

The summer break remains the main opportunity for work that takes rooms offline. In a mixed district the work often splits by era: older campuses get larger replacement projects needing the full break, while newer campuses get shorter verification and maintenance visits that can be fit into evenings and weekends. Planning the two streams separately avoids the temptation to put everything into the same eight weeks.

Newer campuses with controls can also be reprogrammed remotely, but a schedule change that leaves a room hot on the first day of school is as bad as a failed unit. Confirm changes with site staff.

Paperwork behind a public school bid

• DIR registration and prevailing-wage compliance with certified payroll, as for any California public works contract.
• Insurance and bonds as specified.
• Background clearance for workers around students.
• DSA review for covered school alterations.
• Hazardous-materials survey review on older buildings.
• Title 24 acceptance testing and refrigerant handling records; see the Title 24 and permits guide.

Davinci Mechanical: CA contractor license #1083101, UA Local 250 union labor, PLA and prevailing-wage ready with certified payroll. We confirm each agency's registration requirements before pursuing a bid.

Common scopes across a mixed portfolio

Aging rooftop replacement on older and mid-period campuses; warranty-minded service on newer ones; cafeteria refrigeration; ice machines; water heaters; portable classroom units; and controls verification and consolidation.

Treating each campus as its own case

A mixed portfolio also tests a contractor's range. The same crew may need to be comfortable with a decades-old wall unit in the morning and a networked rooftop controller in the afternoon. We staff accordingly, pairing field technicians with controls knowledge where a site calls for it, and we avoid promising results on a system until we have looked at how it actually behaves.

We lead with diagnosis and documentation. We measure, record, and explain what we found in plain language the maintenance team and the business office can both use. We pursue bid-level and project work and offer planned maintenance for districts that want a defined cadence by equipment type. If a replacement decision is in doubt, the second-opinion diagnostic gives an independent read. The Tustin service area page describes our coverage of the city.

Newer growth areas and the large-volume buildings that come with them

Tustin's redevelopment of the former Marine Corps air station property has brought newer civic, commercial and residential development, and with it the demand for schools and facilities serving that growth. Newer growth areas tend to produce buildings with larger glazing, more efficient envelopes and equipment selected under recent energy codes. Those are the buildings where controls and ventilation behavior matter most to comfort.

Whatever the specific campus, the mechanical questions for new-growth schools are consistent: was the system commissioned, is the commissioning documentation available, are the sensors still accurate, and are schedules matched to real use? Because growth areas expand quickly, the district's maintenance team may be covering more buildings than a few years earlier, and a service partner that can take on diagnostic and verification work can ease that load without replacing the district's own staff.

If your project involves a building constructed in the last couple of decades, ask for the commissioning report early. It is the baseline against which every later problem is measured, and it makes the difference between a one-hour diagnosis and a two-day one.

Items to have on hand before bid day

1. The bid package or scope with campus names and building numbers.
2. Equipment lists, if they exist, by campus.
3. Hazardous-materials survey information for older buildings.
4. Warranty terms and manufacturer requirements for newer equipment.
5. Work windows and clearance procedures.
6. Closeout and asset-record delivery requirements.

Call (714) 594-9194 or start at bid projects.