Carrier Rooftop HVAC Repair at Bison Restaurant in Des Plaines
- Business: Bison Restaurant
- Location: Des Plaines, Illinois
- Property type: Commercial restaurant
- Equipment: Carrier rooftop package unit
- Previous replacement quote: Approximately $24,000
- AirFix invoice: $700
- Estimated immediate savings: Approximately $23,300
The Cooling Problem
The rooftop air-conditioning system at Bison Restaurant was no longer cooling the building properly. Indoor conditions had become uncomfortable for employees and customers, making reliable cooling an urgent operational concern.
Another HVAC contractor inspected the Carrier rooftop unit and recommended replacing the entire system for approximately $24,000. Before approving such a significant expense, the restaurant owner contacted AirFix for a second opinion.
Inspection and Diagnosis
AirFix performed a complete commercial HVAC diagnostic before recommending any work. The inspection included:
- Thermostat operation
- Refrigerant operating pressures
- Compressor operation
- Electrical components
- Condenser coil condition
- Evaporator coil condition
- Air-filter condition
- Airflow throughout the rooftop unit
Testing did not identify a failed compressor or another major mechanical failure that would require replacing the equipment.
Instead, the inspection revealed substantial maintenance-related contamination:
- The outdoor condenser coil was heavily clogged with dirt and debris.
- No air filters were installed in the rooftop unit.
- Grease and cooking contaminants had been pulled into the return-air system.
- The evaporator coil was heavily coated with grease, dust, and debris.
- Restricted airflow and heat transfer were causing the compressor to cycle off before completing a normal cooling cycle.
The equipment remained serviceable. The cooling failure was caused by contaminated coils and missing filters—not a confirmed compressor failure.
Why Repair Was the Right Option
Replacing the entire rooftop unit would not have addressed the actual diagnosis economically. Because testing showed that the major mechanical components remained serviceable, AirFix recommended restoring airflow and heat transfer through a thorough cleaning and maintenance service.
This approach allowed the owner to keep the existing Carrier system and avoid a quoted $24,000 replacement.
Work Completed
The completed service included:
- A complete commercial HVAC diagnostic
- Chemical cleaning of the evaporator coil
- Thorough cleaning of the outdoor condenser coil
- Installation of new air filters
- Restoration of airflow through the system
- Refrigerant-pressure verification
- Compressor operation testing
- Complete cooling-performance testing
The evaporator coil required professional chemical cleaning to remove the accumulated grease, dust, and debris embedded across its surface.
Final Testing and Results
After cleaning the coils and installing the filters, AirFix ran the rooftop unit through multiple cooling cycles and verified:
- The compressor no longer short cycled
- Refrigerant operating pressures remained stable
- Airflow across the evaporator coil improved
- The rooftop unit completed normal cooling cycles
- Cooling performance improved significantly
- The restaurant cooled properly during final testing
The system operated normally during final verification, allowing the restaurant to continue using its existing equipment.
Project Cost and Estimated Savings
The total invoice for this completed commercial HVAC service was $700. The work included diagnosis, chemical evaporator-coil cleaning, condenser-coil cleaning, installation of new filters, refrigerant-pressure testing, and final operational verification.
Compared with the approximately $24,000 replacement quote, the targeted service avoided approximately $23,300 in immediate expense.
Pricing note: The $700 invoice was specific to this completed job. Commercial HVAC service costs vary according to equipment condition, contamination, rooftop access, required materials, and the scope of work. Contact AirFix for an evaluation and quote specific to your property.
Maintenance Recommendations for Restaurants
Restaurant HVAC equipment can collect grease and airborne cooking contaminants faster than equipment in many other commercial buildings. For this location, AirFix recommended:
- Replacing air filters on a consistent schedule
- Checking filters more frequently during heavy kitchen use
- Scheduling professional evaporator- and condenser-coil cleaning twice each year
- Monitoring the system for weak airflow or short cycling
- Requesting service promptly when cooling performance declines
The appropriate maintenance frequency depends on operating hours, kitchen conditions, equipment design, and the rate of contaminant buildup.
Commercial Rooftop HVAC Service in Des Plaines
A rooftop unit that is short cycling or struggling to cool does not automatically need replacement. Dirty coils, restricted airflow, electrical problems, and other repairable conditions can produce symptoms that resemble major equipment failure.
AirFix provides commercial AC repair, preventive maintenance, and rooftop HVAC evaluations in Des Plaines and nearby communities.
Contact AirFix Heating & Cooling to request a commercial HVAC evaluation.
Frequently Asked Questions
Does a rooftop HVAC unit need replacement when it stops cooling?
Not necessarily. Restricted airflow, dirty coils, electrical problems, failed controls, and refrigerant-system issues can all reduce cooling performance. The equipment should be diagnosed before repair or replacement is recommended.
Can dirty HVAC coils cause compressor short cycling?
Contaminated coils can restrict airflow or heat transfer and create operating conditions that cause a compressor to cycle off prematurely. An on-site diagnostic is required to identify the specific cause.
How does restaurant grease affect rooftop HVAC equipment?
When filters are missing, damaged, or not replaced regularly, airborne grease and cooking contaminants can collect on the evaporator coil. This buildup restricts airflow and reduces the coil’s ability to transfer heat.
How often should restaurant HVAC coils be cleaned?
The proper schedule depends on kitchen activity, operating hours, filtration, and how quickly contamination accumulates. AirFix recommended twice-yearly professional coil cleaning for this particular restaurant.