When to use: Verifying an installed residential HVAC system actually delivers what it was designed for — instrument-measured performance against design targets, not a code/safety walkthrough. Click each item to cycle Pending → Pass → Fail and track completion.
Commissioning is the step that verifies an installed HVAC system actually performs the way it was designed — instrument-measured airflow, refrigerant charge, static pressure, and control response checked against calculated design targets, not a code-compliance or comfort walkthrough. This interactive checklist tracks the standard set of measurements that close the loop on load calculation, equipment selection, duct design, ventilation, and control sequencing.
A code inspection verifies life-safety and code-minimum installation — disconnect clearances, wire gauge, condensate safety switches. None of that measures whether the system delivers its designed airflow, capacity, or efficiency. A crushed flex duct, an undercharged refrigerant circuit, or a miswired control sequence can all pass a code inspection and a casual comfort check while delivering meaningfully worse performance than designed — commissioning is the only step that measures the installed system against the numbers the design actually calculated.
Airflow verification confirms the duct design (Manual D) was installed as sized, both at individual registers and in total at the air handler. Refrigerant charge verification confirms the equipment (Manual S selection) is delivering its rated capacity, checked via subcooling against the manufacturer's chart rather than by feel. Static pressure verification confirms the installed ductwork and filter/coil stack fall within the equipment's rated pressure budget — exceeding it silently cuts airflow and raises energy draw. Control verification confirms the staging sequence (compressor vs. backup heat, ventilation timing) is wired and configured correctly.
The installing contractor, not the code inspector or AHJ — code inspection exists to verify life-safety and code-minimum practice, not the engineering performance targets (airflow, charge, static pressure) that only the installer is positioned to measure and correct.
Comfort is not proof of correct performance — an undercharged system still cools, a crushed duct run still supplies some airflow, and a miswired control still produces a house at setpoint. Each of these failure modes has a real cost (efficiency, equipment life, or one persistently uncomfortable room) that only shows up over time or on the utility bill, which is exactly why instrument-based commissioning matters even when nothing feels obviously wrong.
The specific numeric targets (design CFM, subcooling target, static pressure budget) are project-specific, derived from that house's Manual J/S/D calculations and the selected equipment's manufacturer data. The checklist structure and measurement categories are general, but always substitute this project's actual calculated values before using it in the field.
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