Commercial HVAC is documented on the mechanical certificate (NRCC-MCH) and is one of the most technical parts of a nonresidential Title 24 report. New systems, replacements, and alterations to equipment, distribution, or controls can all trigger mechanical compliance under California’s Energy Code.
What the mechanical certificate covers
NRCC-MCH addresses equipment efficiency, economizers, fan power, ventilation, demand-controlled ventilation, duct sealing and insulation, and required controls. The scope depends on system type — packaged rooftop units, split systems, VRF, chilled water, or dedicated outdoor air systems each have their own considerations. We prepare the certificate from your mechanical plans and equipment schedules, on the prescriptive or performance path.
Acceptance testing and field steps
Many mechanical measures require acceptance testing (NRCA-MCH) — for example, economizer operation, demand-controlled ventilation, and certain controls — performed in the field during construction by a certified Acceptance Test Technician. Our report is the design-stage documentation; the acceptance tests confirm the installed system performs as designed. We identify which tests your scope is likely to trigger so nothing is missed at inspection.
Replacement vs new-system scope
Whether you are replacing existing equipment or installing a new system changes the mechanical scope. Equipment replacements focus on efficiency, controls, and the acceptance tests triggered by the new units, while new systems add full ventilation, economizer, and distribution documentation. Alterations to ductwork or controls can pull in requirements independently of the equipment itself. We scope the mechanical certificate to the actual work so the documentation — and the acceptance tests scheduled at inspection — match the installed system rather than over- or under-documenting the project.
What we need to quote and prepare your report
Send the mechanical documentation so we scope the system accurately:
- Mechanical plans and equipment schedules
- System type and zoning narrative
- Ventilation and outdoor-air design
- Controls narrative (economizer, DCV, setpoints)
- Conditioned floor area and project scope
- Whether this is new, replacement, or alteration
Example project
Illustrative example — not a specific customer: A commercial suite replaces two aging rooftop units with high-efficiency units that include economizers and demand-controlled ventilation. The project is documented on NRCC-MCH, and the economizer and DCV functions are verified in the field through acceptance testing before final inspection.
Commercial Title 24 pricing
Commercial projects are quoted individually — priced by building type, conditioned floor area, compliance path, and the systems in scope, not a flat rate. Upload your plans for a firm quote, with standard, rush, and same-day options.
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