Garden Grove Unified School District: HVAC & refrigeration bid work guide

Single-story wings and rooftop fleets

Single-story campuses have several mechanical advantages: roof access is straightforward, ladder or hatch routes are short, and cranes can usually reach most roofs from a parking area or a field. They also have disadvantages. Every classroom wing can have multiple units, each with its own condensate line, thermostat and electrical disconnect. Ducts are often routed through ceiling spaces that have been modified over the years, and older insulation or duct wrap may contain materials that require testing before disturbance.

The practical rule on an older campus is to ask about hazardous-materials surveys before a crew opens a ceiling, a duct or a roof penetration. Districts generally maintain records of asbestos and other surveys for exactly this purpose. If the survey is missing or old, expect a request to test first, and build that into the schedule.

What 'many small units' means for cost of ownership

When a campus has dozens of small units, the economics shift toward standardization. Standardizing on a limited number of unit sizes and controls makes spares, training and troubleshooting simpler. A contractor who proposes replacing each unit with whatever is closest in size is creating a maintenance headache for the next decade.

Typical scopes across the campuses

• Wall-mounted heat-pump style classroom units and portable classroom HVAC, which are the highest-volume repair item at many schools of this type.
• Rooftop packaged units serving multipurpose rooms, cafeterias and administrative wings; see RTU and split installs.
• Cafeteria and kitchen refrigeration: walk-in coolers and freezers, reach-ins; see refrigeration and coolers.
• Ice machines for athletics and food service; see ice machines.
• Water heaters for kitchens and restrooms, including circulation problems.
• Controls consolidation, where decades of different thermostats are replaced with a manageable system.

Heavy summer demand makes the first hot week the stress test for all of it. The most frequent causes of 'no cooling' calls in older single-story classrooms are dirty condenser coils, failed capacitors and contactors, and low airflow from filters that were never changed. Those are straightforward repairs, but a pattern of repeat failures on the same unit deserves root-cause diagnosis rather than another capacitor.

Where bids, quotes and service agreements fit

Large unified districts commonly combine formal bids for larger projects with on-call arrangements for repeating needs. For a district with many small, similar sites, an on-call or task-order arrangement can be more practical than bidding each classroom wing separately; others favor job-order contracts or cooperative contracts. Which route is used, and whether the district is currently accepting applications for any pool, is the district's decision, and thresholds and policies change. Confirm current requirements with the agency.

Check the purchasing and business-services pages, the facilities and maintenance department, and any hosted bid portal. The district's board agendas often show contract approvals and the vehicle used. For how a neighboring district presents the same issues, see Santa Ana Unified and Huntington Beach Union High School District. The public agency procurement guide explains each mechanism.

Break-period scheduling

With dozens of small units, the summer window is a production problem: how many units can a crew set, wire, start and test per day, and how many crews can the campus absorb? We plan by rooms-per-day, not units-per-job. Staging is easier on a flat site, but laydown space still needs to be agreed so old units and new units do not block fire lanes or play areas.

During the school year, a failed classroom unit may mean relocating a class or using a portable fan, so rapid response matters more than the paperwork. Plan a stock of the most common failure parts and know which campus has which unit type.

Registrations and reporting to plan for

• Registration with the Department of Industrial Relations, with prevailing-wage rates and certified payroll reporting on public works.
• Insurance and bonds as called for in the bid.
• Fingerprinting or equivalent clearance for workers on campuses with students present.
• DSA and inspector-of-record requirements where the project is covered.
• Hazardous-materials survey review before disturbing older building materials.
• Title 24 documentation and refrigerant records.

We are the union commercial division of Scottish Tom's Heating & Air: license CA #1083101, UA Local 250 labor, PLA and prevailing-wage ready with certified payroll. Our prevailing wage guide.

Standardizing across repetitive campuses

We approach a many-unit campus as a fleet. Each unit gets a record in the DaVinci Portal with location, model, readings and photographs, so repeat failures stand out. A unit that has been repaired three times in two years becomes visible, and the question changes from 'what failed' to 'why does this keep failing.' We pair that with preventive maintenance timed before the hot season. For broader context see the K-12 sector overview and the Garden Grove service area.

Community use and extended hours at neighborhood campuses

Neighborhood campuses in dense suburban cities are often used well beyond the school day: adult education, parent programs, community meetings, youth sports and weekend activities. Each additional use extends the hours that systems run, and wear follows run time more than the calendar. A rooftop unit on a multipurpose room that runs four hours a day on paper may run eight in practice.

For maintenance planning, ask the district's staff what really happens in each building after the final bell. Then compare it to what the controls schedules say. Mismatches in either direction are common: spaces that are conditioned for hours with nobody in them, and spaces that are used regularly but sit outside the schedule and are constantly overridden by hand.

Communicating with building users matters, too. Posted instructions for thermostats, clear contact information for repair requests, and a simple way to report a problem reduce the guesswork. A classroom thermostat that has been set to its extremes by well-meaning staff can mask a perfectly healthy unit or stress a marginal one.

What helps us scope a multi-site job

1. Bid documents, addenda and any district standards for unit types and thermostats.
2. A room and unit list, or permission to survey.
3. Hazardous-materials survey information for affected buildings.
4. Summer window dates and daily access hours.
5. Laydown and crane access information for each campus.
6. Closeout requirements and where asset data should be delivered.

Call (714) 594-9194 or visit bid projects.