Commercial HVAC Diagnostics
NCI-certified commercial system testing for rooftop units, VAV boxes, and building controls. Measure the problem — do not replace the equipment.
Your office tenants are complaining about hot spots in the afternoon. The warehouse pickers are asking for fans because the west side of the building never cools down. The retail manager has called four times this week about temperature swings at the front doors. Three different contractors have looked at the rooftop units, and each one has recommended something different — one says you need to replace the compressor, another says the whole unit is undersized, and the third wants to sell you a building management system upgrade. None of them have measured anything beyond discharge temperature at the supply grille closest to the thermostat.
Commercial HVAC diagnostics at Constant Air Balancing & Services is a measurement-first engineering evaluation of your entire commercial system — not just the rooftop unit that happens to be near the complaint. Our NCI-certified commercial technicians test airflow at every VAV box, every diffuser, and every return grille using calibrated flow hoods. We measure static pressure across filters, coils, and the entire duct network. We verify refrigerant performance at the service ports, check electrical draw at every major component, and evaluate the building management system sequence of operations against what the equipment is actually doing in real time.
The reality of most commercial HVAC problems in Las Vegas is that the equipment is fine — it is the distribution that has drifted out of balance, the controls that are fighting each other, or the ductwork that has developed leakage at connection points after years of thermal cycling. Replacing a rooftop unit when the real issue is a jammed VAV damper or a failed duct static pressure sensor is a $40,000 mistake that does not solve the comfort complaint. A proper diagnostic identifies the root cause before any capital equipment is quoted, so the repair matches the actual failure instead of the most expensive guess. This is especially important for property managers and facility directors who need to justify every repair to ownership or corporate with documented data, not contractor opinions.
After the diagnostic, you receive a written engineering report that documents the measured performance of every subsystem, identifies the root cause of every comfort complaint, ranks recommended corrective actions by impact and cost, and provides the baseline performance data your facility needs for future troubleshooting and capital planning. This report stands up to review by building engineers, energy consultants, and equipment manufacturers — because it is built on measured data, not symptoms. If another contractor has quoted you a major replacement, our diagnostic gives you the independent technical basis to verify or challenge that recommendation before you sign a purchase order. For businesses considering a commercial equipment installation, the diagnostic also ensures the replacement is properly sized to your actual load, not the original equipment capacity that may have been wrong from day one.
Rooftop Unit Performance
We measure total system airflow, supply and return temperatures, refrigerant pressures, and electrical draw at every rooftop unit on the building. This establishes whether each RTU is delivering its rated capacity or operating below design performance.
VAV Box & Damper Verification
We test every variable air volume box for minimum and maximum airflow, damper response, reheat operation, and thermostat signal. A single stuck VAV damper can cause complaints across an entire zone while the RTU performs perfectly.
Static Pressure Mapping
We measure static pressure across filters, coils, the main supply trunk, and critical branch points. These readings identify duct leakage, collapsed flex, and restrictions that force the fan to work harder while delivering less air to the conditioned space.
Controls & BMS Review
We observe building management system programming against what the equipment is actually doing — setpoints, schedules, occupied and unoccupied sequences, economizer operation, and interlock logic. Control failures cause comfort complaints that look like equipment failures.
Engineering Report
All measurements are compiled into a written report with root cause analysis, comparison to design specifications, ranked corrective actions, and cost estimates. Built for property managers, facility directors, and building owners who need documented data to justify repairs.
Beyond the Rooftop
We test RTUs, VAV boxes, ductwork, controls, and the BMS programming — the full chain from equipment to occupant. Most contractors look at the rooftop unit and stop there, missing the real failure every time.
Root Cause, Not Replacement
Our diagnostic finds why your building is failing, not just which piece of equipment happens to be near the complaint. A $40,000 RTU replacement does not fix a $400 VAV damper problem — and we will tell you which one you actually have.
Data for Decisions
Property managers, facility directors, and building owners need documented data to justify repairs and capital expenditures to ownership. Our written engineering report is built to stand up to that scrutiny — not to sell the next upsell.
Still have questions? Contact us directly or call (702) 840-5163 — we are happy to help.