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Commercial Rooftop Unit (RTU) Repair Across NYC
When a rooftop unit goes down, tenants feel it fast. Com+ Mechanical diagnoses and repairs packaged RTUs of every make and tonnage — with 24/7 response for property managers and building owners across the five boroughs and surrounding metro.
Common Rooftop Unit Problems We Resolve
RTU running but not cooling
Low refrigerant from a leak, a failed compressor or contactor, or a tripped high-pressure switch. We isolate the circuit rather than just topping off refrigerant.
No heat from a gas/electric package unit
Failed ignition control, gas valve, flame sensor or limit switch — or a cracked heat exchanger that requires the unit to be shut down for safety.
Short cycling or frequent lockouts
Often a pressure-switch, control-board or sensor fault, an oversized unit, or dirty coils. Short cycling spikes energy use and shortens compressor life.
Economizer stuck or wasting energy
Seized actuators, failed outdoor-air sensors or bad linkages keep dampers in the wrong position — driving up energy spend and tripping comfort complaints.
Tripped breakers or electrical faults
Failing capacitors, contactors, or compressor windings. We test under load to find the failing component before it takes out the compressor.
Water leaks or roof staining below the unit
Clogged condensate drains, rusted drain pans, or curb/flashing issues. Left alone these cause interior damage and tenant complaints.
Rooftop Unit Repair Built for Commercial Buildings
Packaged rooftop units carry the heating and cooling load for most commercial buildings in NYC — retail, office, restaurants, warehouses and mixed-use. When one fails, comfort, occupancy and revenue are on the line. Com+ Mechanical repairs single-zone and multi-zone RTUs, gas/electric and heat-pump packages, with technicians equipped to work on roofs, setbacks and bulkheads safely and to code. We diagnose the actual root cause — not just reset the unit — and give building staff a clear, documented path to resolution.
What Our RTU Repair Service Covers
Why Property Managers Call Com+ for RTU Repair
Our Simple Process
From call to comfort in 4 easy steps
Dispatch & rooftop assessment
We confirm access, safety and unit details, then get a technician on the roof to assess the failed unit.
Root-cause diagnosis
We test the refrigeration, electrical, airflow and control systems under load to find the true cause — not just the symptom.
Scope, quote & approval
You get a documented scope with photos and a clear price before work proceeds. No surprise invoices.
Repair & verify
We complete the repair, verify performance across a full cycle, and leave the unit logged and labeled for your records.
Types of Systems We Install
Gas/Electric Packaged RTUs
Gas-heat, electric-cool packaged units — the most common commercial rooftop configuration.
- •Gas-heat diagnostics
- •Heat-exchanger safety inspection
- •Economizer service
Heat-Pump Packaged Units
All-electric heat-pump rooftop units used in electrification and Local Law 97 strategies.
- •Reversing-valve diagnostics
- •Defrost-control testing
- •Refrigerant management
Multi-Zone & VAV Rooftops
Larger rooftop systems serving multiple zones via VAV boxes and controls.
- •Zone-control troubleshooting
- •VAV coordination
- •BAS integration
The Com+ Mechanical Difference
Commercial-only focus
We work on packaged rooftop equipment every day across NYC — not the occasional residential split system.
Built for property managers
Clear documentation, single point of contact, and coordination with your building staff and tenants.
Whole-portfolio coverage
One vendor for one rooftop or a hundred across multiple buildings and boroughs.
Maintenance that prevents the next call
Every repair comes with a preventive-maintenance recommendation to reduce emergency failures.
Transparent Pricing
No fees. No surprises. Just honest service.
Repair
Approved repair scoped to the failed components and unit.
- Parts and labor scoped to the fault
- Performance verified across a full cycle
- Unit logged and labeled
- Workmanship backed
Maintenance Agreement
Planned RTU maintenance to cut emergency failures across your portfolio.
- Scheduled filter, belt & coil service
- Priority emergency response
- Portfolio-wide reporting
- See our Building Comfort maintenance plans
Pricing shown is a structure, not a quote. Final pricing is confirmed in writing after assessment.
Own a Commercial Property?
Business+ plans start at $499/year — includes 2 rtu tune-ups, 10% off all services, and priority scheduling.
Repair or Replace?
We'll help you make the right decision for your home and budget
Repair makes sense when…
- The unit is under ~12–15 years old and the fault is isolated
- Repair cost is a fraction of replacement and parts are available
- The cabinet, coils and heat exchanger are sound
- You need the space conditioned again today
Replacement is worth pricing when…
- The compressor or heat exchanger has failed on an aging unit
- Repair costs approach a large share of replacement value
- Energy bills and refrigerant (e.g. R-22) costs are climbing
- You want higher efficiency to support Local Law 97 targets
Rooftop Units We Service
Factory-trained technicians for all major HVAC manufacturers
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Don't see your brand? We service all major manufacturers! Call us to confirm.
Proudly Serving Nassau County
Fast, reliable service in your neighborhood
Frequently Asked Questions
Get answers to common questions about our services
Do you offer 24/7 emergency RTU repair in NYC?
Yes. Rooftop failures don't wait for business hours, so we provide 24/7 emergency commercial response across the five boroughs and surrounding metro.
What size and type of rooftop units do you work on?
We service packaged RTUs across common commercial tonnages — single-zone and multi-zone, gas/electric and heat-pump packages — from major manufacturers including Carrier, Trane, York, Daikin Applied and AAON.
Can you service rooftop units across multiple buildings?
Yes. We support property-management companies and owners with multi-site portfolios, giving you one vendor, consistent documentation, and coordinated scheduling across buildings and boroughs.
Will a repair help with Local Law 97 compliance?
A correctly running, well-maintained unit uses less energy, which supports your building's emissions targets. For aging or failing equipment we'll show how replacement options affect efficiency and Local Law 97 exposure.
Do you coordinate roof access and building requirements?
Yes. We coordinate with building staff on roof access, COIs, tenant notice and safety requirements before mobilizing.
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Rooftop Unit Down? Get a Technician On the Roof.
Tell us the building, the unit and the symptom — we'll dispatch and get your space conditioned again. Serving property managers and building owners across the NYC metro, 24/7.
Request RTU Service