No Heat or No Cooling
Diagnosis of ignition, safeties, electrical components, compressors, refrigerant circuits and control calls.
Commercial rooftop HVAC
Service the problem.
Plan the replacement.
EMH Mechanical services, maintains and replaces packaged rooftop units for commercial buildings. We troubleshoot the equipment in place and account for the curb, ductwork, utilities, controls and roof access when replacement is the right move.
DiagnosticsFind the actual failure
RepairHeating, cooling and airflow
ReplacementEquipment through startup
MaintenanceScheduled commercial service
The equipment and the building
An RTU is more than a box on the roof.
The unit has to heat, cool and move the right amount of air—but it also has to work with the building below it.
Roof curbs, duct openings, gas and electrical service, controls, economizers, drainage and access can all affect the repair or replacement. We look at those conditions before we recommend the next step.
Rooftop unit service
Heating, cooling, airflow and controls.
We test the unit as a system instead of guessing from one symptom.
Blowers, Motors & Belts
Service for failed motors, worn belts, bearings, pulleys, wheels, airflow problems and related electrical components.
Controls & Economizers
Troubleshooting for thermostats, relays, sensors, actuators, modules, VFDs and outdoor-air controls.
Heating Components
Inspection and repair of accessible burners, ignition, gas controls, heat exchangers, limits and venting components.
Cooling Components
Electrical and refrigerant-system diagnosis for compressors, condenser fans, coils, metering devices and safeties.
Drainage & Water Problems
Diagnosis of blocked drains, damaged pans, condensate problems and water entering or leaving the unit incorrectly.
Rooftop Unit Replacement
Equipment selection and coordination of curbs, adapters, duct transitions, utilities, lifting and startup.
Scheduled Maintenance
Commercial maintenance planned around equipment quantity, runtime, filter needs, access and the building schedule.
Repair or replace
A practical answer starts with the condition of the unit.
A failed part does not automatically mean the entire rooftop unit needs replacement. Age alone does not tell the whole story either. We consider the failure, overall condition, repair history, parts availability and how the equipment serves the space.
01
Confirm the failureTest the unit and identify the component or operating condition causing the problem.
02
Review the rest of the equipmentLook for additional conditions that affect whether the repair makes sense.
03
Separate repair from replacement planningExplain what is needed now and what may need budgeted later.
04
Define replacement conditionsVerify the curb, ductwork, utilities, controls, access and lift requirements before pricing the project.
EMH Mechanical rooftop work
Service and replacement in real conditions.
These are EMH Mechanical commercial projects—not stock equipment photos.
Rooftop replacement process
Plan the details before the crane arrives.
- 01
Survey
Document the existing equipment, curb, openings, utilities, controls and roof access.
- 02
Select
Match capacity and application requirements to an available replacement unit.
- 03
Coordinate
Plan equipment, curb adapters, transitions, lifting, shutdowns and site access.
- 04
Replace
Remove the old equipment, set the new unit and complete the required connections.
- 05
Start Up
Run the equipment, verify operation and address the project closeout items.
Commercial maintenance
Build a schedule around the equipment—not a generic checklist.
Filter conditions, belt wear, runtime, occupancy and roof access differ from one property to the next. We can set a commercial maintenance scope based on the units at the building and the level of service needed.
Commercial Workmanship1-Year Labor Warranty
EMH Mechanical provides a one-year labor warranty on commercial work. Manufacturer coverage and project-specific terms vary by equipment and scope.
Local commercial RTU contractor
Serving northern Southeast Michigan.
Based in Clinton Township, EMH Mechanical provides commercial rooftop HVAC service and replacement throughout our primary northern territory.
Commercial RTU answers
Questions about rooftop service and replacement.
Start here, then contact us with the building address, unit information and the problem you are having.
Do you service commercial rooftop HVAC units?+
Yes. EMH Mechanical diagnoses and repairs packaged rooftop units used for commercial heating, cooling and ventilation. We work on many common equipment brands and system configurations.
What problems do you repair on rooftop units?+
Common calls include no heat, no cooling, poor airflow, tripped safeties, failed motors, worn belts, ignition problems, electrical failures, control issues, drainage problems and economizer faults. The actual repair is based on testing at the equipment.
Can EMH Mechanical replace an existing RTU?+
Yes. We replace commercial rooftop units and review the existing curb, duct openings, gas, electrical, controls, roof access and lifting requirements before the final scope is prepared.
Can an existing roof curb be reused?+
Sometimes. The replacement unit, curb dimensions, supply and return openings, curb condition and roof setup all have to be reviewed. A curb adapter or other modifications may be required when the new unit does not match the existing curb.
Do you repair economizers and rooftop controls?+
Yes. We diagnose many common economizer, sensor, actuator, thermostat, control-module, relay and variable-frequency-drive problems. Parts availability and compatibility depend on the equipment and control system in place.
Do you offer rooftop unit maintenance?+
Yes. Commercial maintenance can include filters, belts, blowers, coils, drains, electrical components, heating, cooling and control operation. The visit frequency and exact scope are based on the building and equipment.
Can you work around an occupied business?+
Yes. We discuss roof access, interior access, shutdowns, occupied areas and the expected work before the job starts. Some repairs or replacements may still require a planned interruption.
Where do you provide commercial RTU service?+
Our primary commercial service territory covers Northern Oakland County, Northern Macomb County, St. Clair County, Genesee County and Lapeer County. Contact us with the building address if the property is near the edge of that area.
Commercial rooftop HVAC
Need RTU service—or planning a replacement?
Call EMH Mechanical or send us the building address, unit information, photos and any known service history.