Commercial Rooftop Unit Service
The workhorse of commercial cooling — and the first thing to fail on a 100-degree afternoon.
Where RTUs Actually Fail
Packaged rooftop units cool most of the commercial square footage in Texas — retail strips, offices, schools, warehouses. They are simple in concept and brutal in practice: the entire machine sits in direct sun on a hot roof, pulling in dust, pollen, and grease-laden exhaust from a kitchen hood forty feet away.
The failure pattern is predictable. Condenser coils foul and head pressure climbs until the compressor trips on high-pressure lockout. Economizer dampers seize open and pull 100-degree outside air into the return during peak load. Belts glaze, bearings dry out, contactors pit, and the condensate pan rusts through and drops water onto a ceiling grid.
Almost none of that is sudden. Nearly all of it is visible on a coil inspection or a superheat/subcooling reading weeks before the unit locks out — which is exactly the argument for a maintenance interval rather than a repair call.
RTU Services
Compressor & Refrigeration Circuit
Compressor replacement, TXV and metering device work, leak repair, and refrigerant recovery/charging under EPA 608 requirements.
Economizer Repair & Calibration
A stuck economizer is one of the largest silent energy penalties in a building. We repair actuators, linkages, and outside-air sensors, then verify the changeover setpoint.
Coil Cleaning & Airflow
Condenser and evaporator coil cleaning, filter programs, belt and bearing service, and blower motor replacement to restore design airflow.
Electrical & Controls
Contactors, capacitors, control boards, safety switches, and thermostat/BAS integration — diagnosed against the unit’s sequence of operations.
Condensate & Drainage
Pan repair or replacement, drain line clearing, trap correction, and overflow switch installation to prevent a ceiling-tile failure.
Changeout & Curb Adaptation
Crane-set RTU replacement with curb adapters when the new footprint differs, including gas, electrical, and controls tie-in.
Our RTU Diagnostic Process
Read the System Before Touching It
Pull the sequence of operations and any available BAS trend data. A unit that is short-cycling because of a control strategy will not be fixed with a new contactor.
Airflow First
Verify filters, belts, blower condition, and static pressure. Refrigerant readings taken on a unit with starved airflow will send you chasing a charge problem that does not exist.
Refrigeration Circuit Measurement
Superheat and subcooling measured against the manufacturer’s charging chart, plus head and suction pressures corrected for ambient — the difference between a real diagnosis and a guess.
Electrical & Safety Verification
Amperage draw against nameplate, capacitor microfarad readings, contactor condition, and every safety switch confirmed functional rather than jumpered out.
Repair, Then Prove It
After the repair, the unit runs to steady state and is re-measured. The service report carries the before/after readings, not just a description of the part replaced.
Repair or Replace?
Rooftop Unit Down?
We service packaged RTUs across East Texas, Houston, and DFW — emergency and scheduled.