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24/7 Emergency Commercial HVAC Repair Across the NYC Metro
When a rooftop unit, chiller, boiler, or air handler goes down and tenants are calling, Com+ Mechanical mobilizes around the clock. We diagnose, stabilize, and restore whole-building heating and cooling fast, anywhere in the five boroughs, Nassau, Westchester, northern NJ, and Stamford CT.
Building HVAC Emergencies We Respond To
No cooling building-wide during a heat event
A rooftop unit or chiller has tripped on a high-head-pressure lockout, lost a compressor, or shed refrigerant charge, leaving entire floors without conditioning while tenant calls climb. We isolate the fault, reset safeties correctly, and restore cooling or stage temporary cooling for occupied and critical spaces.
No heat across the building on a freezing morning
A commercial boiler in lockout, a failed circulator pump, a tripped low-water cutoff, or an ignition and flame-sensing fault can drop a whole building below comfortable, and freeze-risk, temperatures. We diagnose the combustion or hydronic chain and bring heat back before pipes and tenants are at risk.
Water leak, flooding, or pump failure in the mechanical room
A burst hydronic line, failed pump seal, cracked heat exchanger, or overflowing condensate can flood a mechanical room or ceiling below. We stop the source, secure the system, and protect the building envelope and tenant spaces from further water damage.
Burning smell, smoke, or electrical odor from HVAC equipment
A seized motor, failing belt, overloaded contactor, or scorched control board can produce smoke and odor that triggers tenant alarm and life-safety concerns. We respond as urgent, de-energize the affected equipment, and find the electrical or mechanical root cause.
Chiller or RTU short-cycling, tripping breakers, or in alarm
Repeated compressor short-cycling, nuisance breaker trips, or a BMS flooding alarms usually signal a refrigerant, electrical, or controls fault that will worsen if run. We interpret the fault codes, correct the underlying issue, and prevent a full compressor or contactor failure.
Server room, kitchen, or critical-space cooling loss
When a dedicated unit serving an IDF/MDF, data closet, or commercial kitchen fails, heat builds fast and equipment or food safety is on the line. We prioritize these spaces and deploy temporary cooling immediately while repairing the failed unit.
Whole-Building HVAC Emergencies, Handled Around the Clock
A commercial HVAC failure is never just an equipment problem, it is an occupancy problem. A tripped chiller during a July heat wave, a locked-out boiler on a sub-freezing morning, or a rooftop unit that quits over a holiday weekend puts tenants, leases, server rooms, and life-safety conditions at risk within the hour. Com+ Mechanical provides 24/7/365 emergency response for the entire building system, not just a single thermostat. Our field technicians arrive equipped to troubleshoot rooftop packaged units (RTUs), air- and water-cooled chillers, cooling towers, hot water and steam boilers, air handlers (AHUs), VAV systems, pumps, and building automation controls. We carry common commercial parts, gauges, combustion analyzers, and recovery equipment on the truck so most calls move straight from diagnosis to a working fix or a safe temporary stabilization on the first visit. When a component must be sourced, we keep your building conditioned with bridge measures, such as temporary cooling, staged equipment, or partial-system operation, while the permanent repair is scoped. From a single property to a managed portfolio, one call to (332) 600-4640 reaches a team that knows how downtime cascades through a commercial building and treats it accordingly.
What Our Emergency Response Covers
Why Buildings Call Com+ for Emergencies
Our Simple Process
From call to comfort in 4 easy steps
Call and triage
Reach a live dispatcher at (332) 600-4640. We confirm the nature of the emergency, the equipment involved, building access and after-hours entry details, and any life-safety or critical-space concerns, then dispatch the right technician and equipment.
Rapid on-site diagnosis
Our technician arrives, secures the equipment, and works the fault systematically, electrical, refrigerant, combustion, hydronic, or controls, using gauges, meters, combustion analyzers, and BMS fault codes to pinpoint the true root cause, not just the symptom.
Stabilize and restore
We make the repair on the spot when parts are on the truck, or safely stabilize the system and deploy temporary conditioning for occupied and critical spaces when a component must be sourced, so the building stays usable.
Document and plan follow-up
You receive written findings, the root cause, and a scoped plan for any permanent repair or replacement, plus guidance on preventing a repeat, so the emergency converts into a controlled, budgeted next step.
Types of Systems We Install
Rooftop Packaged Units (RTUs) & Split Systems
The workhorse of most commercial buildings, RTUs and packaged systems fail on hot days from compressor lockouts, contactor and capacitor faults, refrigerant issues, and economizer or control problems. We diagnose and restore packaged cooling and heating fast, on the roof, in any weather.
- •Compressor, contactor, and capacitor diagnosis and replacement
- •Refrigerant-circuit and head-pressure troubleshooting
- •Economizer, sensor, and control-board fault correction
- •Belt, motor, and airflow restoration
Chillers & Cooling Towers
Central cooling plant failures take down large floor areas at once. We respond to air- and water-cooled chiller lockouts, compressor and oil faults, low/high pressure trips, condenser and tower issues, and pump or flow problems to bring central cooling back online or stage temporary cooling.
- •Chiller fault-code interpretation and safe reset
- •Compressor, oil, and refrigerant-pressure diagnostics
- •Cooling tower, condenser-water, and flow troubleshooting
- •Temporary cooling deployment for critical and occupied spaces
Commercial Boilers & Hydronic Plants
When heat goes out, the boiler and hydronic loop are usually the cause. We respond to boiler lockouts, ignition and flame-sensing faults, low-water-cutoff trips, circulator pump failures, and zone valve and control issues on hot water and steam systems to restore building heat and prevent freeze damage.
- •Boiler lockout and combustion diagnostics
- •Ignition, flame-sensing, and low-water-cutoff repair
- •Circulator pump and zone valve troubleshooting
- •Hot water and steam system restoration
Why Com+ Mechanical for After-Hours HVAC
Commercial-only focus
We serve property managers, building owners, and facility teams across the NYC metro. Our technicians live in commercial systems, packaged rooftop units, central plants, hydronics, and automation, so they read a building's failure correctly under pressure.
Genuine 24/7/365 coverage
Emergencies do not keep business hours. Our after-hours line is staffed around the clock so a failure at 2 a.m. on a holiday gets the same urgent dispatch as a Tuesday afternoon.
Portfolio-ready
Whether you run one Class A tower or a portfolio of buildings, you get a single point of contact, technicians who can be briefed on each site's equipment, and consistent documentation across every property.
Fix-first, transparent approach
We aim to restore operation on the first visit, give you honest findings and root cause in writing, and scope follow-up work clearly, with no surprise overtime structures. Pricing is confirmed before non-emergency work proceeds.
Transparent Pricing
No fees. No surprises. Just honest service.
Emergency Repair & Restoration
On-the-spot repair or temporary conditioning to bring the building's HVAC back online and protect occupied and critical spaces.
- On-truck replacement of common failure parts to restore operation on the first visit
- Temporary cooling or staged operation when a component must be sourced
- Prioritized handling of server rooms, kitchens, and other critical spaces
- Post-repair verification and root-cause documentation
Priority Emergency Coverage (Maintenance Agreement)
A planned-maintenance agreement that bundles scheduled service with priority after-hours response and more predictable emergency pricing.
- Front-of-line emergency dispatch for covered buildings
- Scheduled preventive maintenance to reduce emergency frequency
- Site equipment profiles on file for faster, better-informed response
- Consolidated reporting and budget predictability across one or many buildings
All emergency pricing is scoped on site after the technician diagnoses the failure, because commercial systems and access conditions vary widely. We confirm the repair scope before proceeding with non-emergency follow-up work.
Own a Commercial Property?
Business+ plans start at $499/year — includes 2 rtu tune-ups, 10% off all services, and priority scheduling.
Equipment & Brands 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
Are you really available 24/7, including holidays?
Yes. Com+ Mechanical staffs an emergency line around the clock, 24 hours a day, 7 days a week, 365 days a year. Nights, weekends, and holidays all get the same urgent dispatch. Call (332) 600-4640 and you reach a live dispatcher who can mobilize a technician to your building.
How fast can a technician get to my building?
Response time depends on the time of day, traffic across the NYC metro, and which technician is closest to your site, but emergencies are dispatched immediately and treated as top priority. Buildings on a maintenance agreement receive front-of-line dispatch. When you call, we give you a realistic arrival window for your specific location.
Can you handle emergencies across a portfolio of buildings?
Yes. We work with property managers and owners who run multiple buildings and need one point of contact. We keep equipment profiles for each site so our team arrives informed, and we provide consistent documentation across every property, so you can manage emergencies portfolio-wide instead of vendor by vendor.
What types of commercial equipment do you service in an emergency?
We respond to whole-building system failures: rooftop packaged units (RTUs), air- and water-cooled chillers, cooling towers, hot water and steam boilers, air handlers (AHUs), VAV systems, pumps, and building automation and controls. Our technicians are equipped to diagnose electrical, refrigerant, combustion, hydronic, and controls faults on commercial equipment.
What should I do right now while I wait for the technician?
Keep occupants away from any equipment producing smoke, burning odor, or active water leaks, and if it is safe and you are trained to do so, de-energize that specific unit at its disconnect. Note any fault codes or alarms on the equipment or BMS and have them ready, along with after-hours building access details, when our technician arrives, so we can move straight to diagnosis. If there is any smell of gas or a carbon monoxide alarm, evacuate and call 911 and your utility first.
Can fixing this emergency also help with Local Law 97 and efficiency?
Often, yes. The same failures that cause emergencies, a fouled chiller, a short-cycling compressor, a boiler running outside spec, or controls that have drifted, also waste energy and raise a building's carbon intensity under NYC Local Law 97. After we stabilize the emergency, our written findings flag efficiency and reliability issues so you can fold the permanent fix into a plan that improves performance and supports LL97 compliance, rather than just patching and waiting for the next failure.
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Building HVAC Down? Call Now.
Every minute a commercial system is offline, tenant complaints, lease exposure, and risk to critical spaces climb. Com+ Mechanical answers 24/7/365 and mobilizes technicians who handle whole-building systems across the five boroughs, Nassau, Westchester, northern NJ, and Stamford CT. Call (332) 600-4640 now for emergency dispatch, or ask about a maintenance agreement that gives your buildings priority response, fewer emergencies, and predictable budgets.
Call (332) 600-4640 Now