A zone is not cooling
The fan may run while supply air stays warm, or one tenant area may drift above setpoint.
Nassau County light-commercial service
Commercial Rooftop HVAC Repair on Long Island
Diagnostics, repair and planned maintenance for packaged rooftop units serving offices, retail spaces, restaurants, houses of worship and other light-commercial properties in Nassau County.
Share the equipment nameplate and roof-access details when possible. Dispatch confirms service capability, current availability and the appointment window before the visit.
- Equipment confirmed before dispatch
- Written option before approved work
- Nassau County service area
Repair signals
When a rooftop unit needs professional diagnosis
Commercial comfort problems can involve the packaged unit, controls, airflow or the building. The symptom helps define the first diagnostic steps.
The unit is not heating
Packaged gas heat, heat-pump operation, safeties or controls may need diagnosis.
Airflow has dropped
Filters, belts, blower components, dampers, coils or duct conditions can restrict airflow.
New noise, odor or cycling
A changed sound, burning odor, repeated restart or breaker trip warrants a system check.
Controls show an alarm
Share the thermostat, economizer or control-board message when you request service.
Comfort complaints repeat
Recurring hot and cold zones can involve equipment, controls, airflow or building load.
Diagnostic scope
What an RTU service visit can evaluate
The exact work depends on the unit, complaint, safe roof access and approved visit scope. These are common checkpoints—not a promise that every system or component is supported.
Home+ focuses on residential and light-commercial HVAC. Confirm the equipment type, capacity, fuel, controls and site requirements before dispatch so the team can verify fit.
- Incoming power, disconnects, contactors, capacitors and control circuits
- Thermostat calls, safeties, control boards and zone inputs
- Filters, blower assemblies, motors, belts, pulleys and supply airflow
- Condenser and evaporator coils, condensate paths and visible drainage issues
- Refrigeration operation and temperature or pressure findings where applicable
- Economizer dampers, actuators and outdoor-air operation where equipped
- Gas heat, ignition and combustion components where applicable
- Unit condition, nameplate details and access constraints for repair planning
Service process
A clearer handoff for property and facility teams
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01
Describe the affected space
Tell us which zones are affected, what occupants are experiencing and whether the unit is running.
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02
Confirm equipment and access
Share the nameplate, roof-access instructions, site contact and any landlord or escort requirements.
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03
Diagnose the operating fault
The technician evaluates the unit and documents findings that are observable within the approved visit scope.
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04
Review the written option
You receive the proposed scope and price before repair or replacement work is authorized.
Planned maintenance
Build the maintenance interval around the equipment and building
Filters, operating hours, occupancy, outdoor exposure and equipment documentation all affect service frequency. Home+ Business+ plans provide a path for recurring RTU maintenance; plan scope and current pricing are published separately.
Long Island rooftop conditions to document
Summer humidity
Condensate removal, coils and airflow affect comfort and moisture control.
Coastal exposure
Salt, wind and airborne debris can influence cabinet and coil condition.
Winter weather
Snow, ice and freeze-thaw conditions can affect access and outdoor-air components.
Roof logistics
Hatches, ladders, curbs, fall protection and landlord rules shape the service plan.
Request service
Tell us what the rooftop unit is doing
Submit the building contact and ZIP code. The commercial team will confirm equipment details, roof access, scope fit and current scheduling availability by phone.
Prefer to speak with dispatch?
(516) 259-1191Service area
Commercial rooftop HVAC service in Nassau County
Current coverage is centered on Nassau County. Dispatch confirms the address, equipment and access before scheduling. Browse the local community hubs for broader service-area context.
Planning a replacement?
Curb, structural, electrical, gas, duct and crane requirements vary by municipality and project. A written scope should identify which parties are responsible before work begins.
Review rooftop-unit replacement planningCurrent business incentive eligibility is project-specific. Review the official PSEG Long Island business program page and confirm any estimated incentive in writing for the proposed equipment.
Recent work
Recent commercial rooftop jobs
MaintenancePlainview, NY·Commercial rooftop units
Commercial Rooftop HVAC Inspection & Filter Change in Plainview
See the job
MaintenanceWestbury, NY·Commercial rooftop units
Commercial Rooftop Unit Maintenance on Two Trane RTUs in Westbury
See the job
Photos enhanced for clarity.
Frequently asked questions
Commercial rooftop HVAC service questions
What are the signs that a commercial rooftop unit needs service?+
Call when an occupied zone loses heating or cooling, airflow drops, the unit short-cycles, a breaker trips, water appears near a ceiling or roof penetration, or the equipment develops a new noise or odor. A dispatcher will confirm the equipment and current availability before a visit.
What information should I have before requesting RTU service?+
If available, share the unit make, model and serial number; approximate tonnage; affected zones; thermostat or control alarms; roof-access instructions; and whether a ladder, hatch, key, escort or property-manager approval is required. Photos of the nameplate and roof access can help the team prepare.
What rooftop HVAC problems can you diagnose?+
For equipment within our light-commercial scope, diagnostics can include power and control faults, contactors and capacitors, blower motors and belts, filters and airflow, condensate drainage, coils, economizer operation, heating components, refrigeration performance and thermostat or zone-control inputs. Confirm the exact unit when requesting service.
When should a rooftop unit be repaired instead of replaced?+
The decision depends on the diagnosis, equipment age and condition, repair history, refrigerant and parts availability, efficiency, comfort needs, roof curb and duct compatibility, and the installed replacement scope. We can document the current finding and outline repair or replacement assumptions before approved work begins.
How often should a commercial RTU be maintained?+
Frequency depends on the manufacturer, operating hours, occupancy, filters, kitchen or process loads, outdoor exposure and lease requirements. Many systems benefit from professional checks before peak heating and cooling seasons, but the right interval should follow the equipment documentation and actual site conditions.
Do rooftop-unit replacements require crane coordination?+
They may. Requirements vary by municipality and project scope. Replacement planning can involve roof access, structural or curb review, electrical and gas work, duct transitions, weatherproofing, equipment delivery and crane logistics. Those items should be identified in the written scope before work is scheduled.
Do you provide after-hours commercial rooftop HVAC repair?+
Call the dispatcher to describe the affected space and equipment. Current appointment and after-hours availability depends on call volume, technician availability, location, roof-access rules, weather, parts and the work required.
Related commercial HVAC resources
Explore cooling, heating, recurring maintenance and broader local coverage.
Tell us what the rooftop unit is doing
Dispatch confirms equipment, access and timing.