A school HVAC modernization scope is built backward from the first day of class. It sets phasing by building, identifies whether DSA review applies to a public school, requires certified payroll, specifies controls and ventilation, and lists the procurement and closeout paperwork the district expects. The work window is short, so submittals, equipment lead times and approvals must be scheduled before summer begins.
- The calendar is the scope. Work that cannot finish before students return needs a plan that does not depend on a last-minute rush.
- For public K-12 schools, DSA review and inspection can apply to HVAC work. Confirm with the district architect or project inspector early.
- Phasing by building keeps classrooms available and gives the district a clean way to accept work in pieces.
- Prevailing wage and certified payroll are part of the paperwork on public work, and the scope should say how payroll reports are submitted.
- Controls and ventilation outcomes should be tested, documented and handed to the maintenance team, not only installed.
Start with the first day of school and work backward
Districts do not get to pick a convenient time for HVAC work. The real window is the summer break, sometimes with a few weeks on either side and occasional holiday gaps. A scope that ignores that window produces a bid with an optimistic schedule and a change order in August.
Write the schedule logic into the scope itself. Equipment release, DSA or other approvals, submittals, crane dates and acceptance testing all need dates. The public agency and school HVAC procurement guide explains how the bidding side of that works; this page covers what the scope document should say once you have a project in mind.
A typical project timeline
- Assessment and basis of design: survey the existing equipment, controls and ventilation, and decide which buildings and systems are in scope.
- Approval track: determine whether DSA review applies, whether the work is bid or piggybacked on an existing agreement, and what board action is needed.
- Procurement: submit bids or proposals, award, and collect bonds, insurance and registrations as the district requires.
- Submittals and ordering: equipment data, controls submittals and long-lead equipment orders placed before the school year ends.
- Summer installation: phased by building, with daily access agreements and safety coordination.
- Testing, balancing and commissioning: functional testing of controls and ventilation before students return.
- Closeout: record documents, warranty paperwork, training and a maintenance handoff.
Steps one through four often take longer than the construction itself. A district that begins in April for a June start has already compressed the schedule. Orders for rooftop packaged units and controls components can take months, so earlier is better.
DSA involvement for public schools
The Division of the State Architect (DSA) reviews and oversees construction at California public K-12 schools. HVAC work can fall under DSA oversight depending on its nature, whether it affects structure or life safety, and how the district classifies the project. Some work is exempt or follows a streamlined path. The classification is made by the district and its design professionals, not the mechanical contractor.
For the scope, that means three things:
- State whether the project is DSA-approved, exempt, or still being determined. Do not leave it blank.
- Identify the inspector of record, the process for notifying them and any hold points the contractor must respect.
- Describe how field changes are submitted for review so a substituted curb, support or equipment weight does not stall the job.
Anchorage and support of rooftop equipment is a common DSA-related item. The structural design and its inspection are not mechanical-contractor scope unless the contract says otherwise, so name the structural engineer or the party responsible. Confirm current requirements with the district architect.
Phasing by building
Schools are rarely one building. A campus has classroom wings, a multipurpose room, a library, a gym, administration and often portable classrooms. Phasing should say which buildings go first and why.
| Phase logic | Why it works | Scope language to add |
|---|---|---|
| Worst failures first | Protects classrooms that would otherwise be unusable | Priority list from district, with authority to adjust |
| Same equipment type together | Crane mobilizations and ordering are efficient | One crane day per phase, scheduled in advance |
| Occupied summer programs last | Avoids noise and access conflicts with summer school | Hours of work, noise limits and restricted areas |
| Gym, cafeteria and multipurpose room early | Large spaces with long-lead equipment and event schedules | Date by which the space must be available |
Partial acceptance is useful. If building A is finished, tested and signed off in July, the district can start using it and the contractor can move crews and tools without carrying incomplete work through the whole summer.
Certified payroll, procurement and insurance paperwork
Public school work in California generally requires prevailing wage and certified payroll, with contractor registration through the Department of Industrial Relations (DIR). Davinci is PLA and prevailing-wage ready, with certified payroll prepared for the work our own UA Local 250 crew performs. Read the prevailing wage guide for the background.
- How certified payroll records are submitted, to whom and how often.
- DIR registration and contractor license requirements for the project, including the license classification the district expects.
- Insurance certificates, additional-insured wording and any district-specific forms.
- Bid or proposal documents, addenda acknowledgment and award sequence.
- Fingerprinting or background clearance for people working on campus when students or staff are present, as the district requires.
If the project is a competitive bid, see public works HVAC bid scope of work and the bid projects page for how we respond.
Controls and ventilation outcomes
School modernization is rarely only a box swap. New equipment arrives with controls, and the district's maintenance staff usually wants schedules, setpoints and alarms they can see. Ventilation is part of that: classrooms are densely occupied, and outside air delivery matters for comfort and air quality.
- Specify the control platform and open or proprietary protocol, and who owns the controller programming.
- Include occupied and unoccupied schedules by room or zone, with a procedure for holiday and event changes.
- Require outside air quantities to be measured and recorded, and economizer operation to be tested.
- List the sensors included, such as space temperature and carbon dioxide where specified, and how often they must be calibrated.
- State training: who is trained, how long, and on what format.
The controls detail is covered more fully in building automation controls upgrade scope of work, and airflow verification in testing, balancing and commissioning.
Closeout and sample language
Contractor shall perform the work in phases by building in the sequence agreed with Owner, and shall complete each phase, including functional testing, before the Owner's stated occupancy date for that building. Contractor shall furnish certified payroll records as required for public work and shall coordinate inspections with the inspector of record. Contractor shall deliver record drawings, equipment data, controls sequences and operating instructions to Owner's maintenance staff at the end of each phase.
Closeout should end with a maintenance handoff. Equipment records, filter sizes, belt sizes, controls sequences and a first-year service plan give the district what it needs. If there is no in-house crew for the next several years, a maintenance contract for schools and public agencies keeps the modernization from decaying. See also our schools industry page.