Rooftop Package Units
Installation, replacement, service and repair of RTUs — the workhorse of most Long Island commercial buildings.
Cooling
Commercial Cooling Solutions On Long Island
Rooftop units, ductwork and commercial cooling systems for Long Island businesses. NJM keeps offices, restaurants and retail spaces running across Nassau and Suffolk County, with emergency response around the clock.
ROOFTOP UNITSDUCTWORKPREVENTIVE MAINTENANCE24/7 EMERGENCY
Licensed & Insured
Master Plumber
TASK 86/87 Certified
Navien NSS Certified
22+ YEARS ON LONG ISLANDGet Your Free Estimate
LICENSED & INSURED · NASSAU & SUFFOLK
PLUMBING · HEATING · COOLING · CONTRACTING
Have An Emergency? We’re Available 24/7.
631-587-0085WE ANSWER EVERY CALLCooling
Commercial Cooling For Long Island Businesses
When commercial cooling fails, the cost is rarely the repair. It is the restaurant that cannot serve, the shop customers walk out of, the office that sends people home, and the server room that starts throttling. That changes what a business should actually want from an HVAC contractor — not the lowest hourly rate, but someone who answers at two in the morning and turns up with the right part.
NJM installs, services and repairs commercial cooling across Nassau and Suffolk County: rooftop package units, split systems, ductwork and ductless zoning for offices, restaurants, retail and multi-family properties. Licensed and insured, 24 hours a day, every day of the year.
24/7 Emergency ServiceLicensed & Insured
Master PlumberLicensed to pull permits
TASK 86/87Certified for gas work
Navien NSSFactory-trained on tankless
22+ years on Long Island · Plumbing, heating, cooling, gas and contracting under one roof
What We Handle
Commercial Cooling Services
Preventive Maintenance
Scheduled service on the equipment you cannot afford to lose. It costs a fraction of the emergency it prevents, and it is scheduled at your convenience rather than in a heat wave.
Commercial Split Systems
Split systems for offices, retail and back-of-house, installed and maintained.
Ductless Zoning
Independent control for spaces with different loads — a server room and a showroom should not share a thermostat.
Ductwork
Assessment, repair and modification. Leaking or badly balanced commercial ductwork wastes a large share of what the plant produces.
Restaurant & Kitchen Cooling
Spaces with a serious heat load and make-up air requirements, which is its own problem rather than a bigger version of an office.
Emergency Repair
Answered 24 hours a day, every day of the year. An overnight failure is a morning that does not open, and that is the call we staff for.
Scheduled Around Trading
Planned work fitted to your hours wherever the job allows.
Cooling — before you call
Two kinds of visit. You’ll know which before we come.
We don’t charge to quote a job. We do charge to find a problem nobody has identified yet. Which one you need — and what it costs — gets agreed on the phone, so nothing about the cost is a surprise on the doorstep.
The rate you are told is the rate
You get the number on the phone, before anyone is dispatched, and it is what you are charged when the technician arrives. One rate across all four trades — plumbing, heating, cooling and gas.
What it pays for
A licensed, insured technician carrying the certifications the work needs, and the time to find what has actually failed — not a quick look and a guess.
Watch for the bait and switch
A call-out advertised at almost nothing gets recovered once someone is standing in your basement. Get the number before anyone travels — from us, or from anyone else you call — and hold them to it when they arrive.
Financing on larger jobs
A boiler that fails in January is not a purchase anyone planned. Financing is available on the big-ticket work, so a system replacement does not have to come out of savings in one go.
What it is normally used for
Boiler, furnace and water heater replacement, a full air conditioning system, a whole-house repipe, sewer and water main work, and larger contracting jobs — kitchens, bathrooms, dormers and extensions.
When to bring it up
At the estimate, before anything is scheduled. It is worth asking even if you think you will not need it, because knowing it is there changes what you are willing to consider fixing properly.
What it does not change
The price of the job. The quote is the quote whether you finance it or not — and on a straightforward repair it is usually not worth the paperwork. We will tell you which one you are looking at.
Financing provided throughSynchronyCredit is extended by Synchrony. Subject to credit approval.
Call 631-587-0085Not sure which one you need? Call and describe it — we will tell you before we book anything.
Common Faults
What Goes Wrong On Commercial Systems
Commercial cooling fails differently from a house. The equipment runs far longer hours, the load changes as the space changes, and nobody notices a slow decline until a heatwave exposes it.
One Zone Freezing, Another Sweating
Almost always distribution rather than the unit — dampers, duct runs added over the years, or a layout that no longer matches how the space is used. Replacing the equipment does not fix it, and we will say so before you spend the money.
A Rooftop Unit Down In A Heatwave
The failure that costs the most, on the day it costs the most. Rooftop units are exposed to weather year-round and give plenty of warning if anyone is looking — most of these calls were preventable at the last service.
Refrigerant Keeps Needing Topping Up
Refrigerant is not consumed. If a system needs charging repeatedly, it is leaking, and topping it up is paying for the same gas twice. Worth knowing that systems built from 2025 use R-454B rather than R-410A, so the economics of a large leak repair on older equipment are worth checking before committing.
The Space Changed Use
An office turned into a gym, a stockroom turned into a kitchen, a wall came down. The cooling was sized for the old room. Symptoms look like equipment faults and are really a load calculation nobody redid.
Bills Climbing Without More Hours
Same opening hours, rising cost. Usually a system working harder than it should — dirty coils, failing controls, a system short-cycling, or a leak. All of it invisible until someone measures.
No Maintenance History
Equipment inherited with the lease and never serviced. The first visit is mostly finding out what you have, what condition it is in, and whether the sensible move is a service contract or a replacement plan.
Trusted Equipment
Brands We Install & Service
More Cooling Services
Everything We Handle In Cooling
One licensed team, one number to call, across Nassau and Suffolk County.
Current Offers
Money Off, Plainly Stated
What it says on the coupon is what comes off the bill. Mention it when you call.
Maintenance Plans
Cooling Maintenance & Tune-Ups
A system nobody services runs longer to do the same job, costs more doing it, and picks the first heat wave to stop. Preset or custom plans, for homes and for commercial buildings.
Code NJM-COOLPLANNo expiryAsk us →$50 OffYour First Service Call
New to NJM? Fifty dollars off the first time we come out — one licensed team for plumbing, heating, cooling and gas.
Code NJM-FIRST50Expires October 31, 2026See the details →Common Questions
Frequently Asked Questions
How quickly can you respond to a commercial cooling failure?
We answer 24 hours a day, every day of the year, from North Babylon. Call 631-587-0085. For a business, calling at the first sign — reduced output, unusual noise, short-cycling — is usually the difference between a service call and a closed day.
Is preventive maintenance actually worth it?
For equipment you cannot trade without, yes, and the argument is about timing rather than cost. Maintenance happens when you schedule it; failure happens in the first heat wave of the summer, when every HVAC company on Long Island is already overloaded. That is what you are actually buying.
Do you service rooftop units?
Yes — installation, replacement, service and repair. RTUs are the most common commercial setup we work on across the area, and their exposure to weather makes regular service more relevant, not less.
Our building has hot and cold spots. Is that the units?
Often it is the ductwork or the zoning rather than the plant. Commercial buildings frequently have areas with completely different loads — a kitchen, a server room, a sunlit showroom — running from one system and one thermostat. Replacing the unit will not fix that. We will diagnose the distribution before recommending equipment.
Can you work outside our trading hours?
Wherever the job allows. Planned work is much easier to schedule around trading than emergency work, which is another argument for maintenance. Tell us your hours when you call.
Do you handle restaurant cooling?
Yes. Commercial kitchens are their own problem rather than a larger office — very high heat loads, make-up air requirements, and an environment that is hard on equipment. We handle the cooling and, being TASK 86/87 certified, the gas side too.
Is the service call fee different for commercial?
No, one rate — the same for commercial and residential, and the same across all four trades. You get the figure on the phone before anyone is dispatched. Emergency, after-hours, weekend and holiday calls are quoted the same way.
Are estimates free?
Yes, free and with no obligation for installation and replacement work. Call 631-587-0085, or use the form and we will be in touch within 24 hours.
Service Area
Proudly Serving Long Island and Surrounding Areas.
Based in North Babylon, working across both counties — close enough to get there fast, local enough to know the housing stock and the permit offices.
Find Cooling Services Near You!
- Long Island
- Nassau County
- Suffolk County
Towns We Serve
- North Babylon
- Babylon
- West Babylon
- Deer Park
- Lindenhurst
- Farmingdale
- Massapequa
- Hicksville
- Dix Hills
- Commack
- Islip
- Hempstead
- North Hempstead
- Rockville Centre
Proudly serving all of Nassau and Suffolk County, with deep local roots near our North Babylon home base.
Get A Free EstimateWhat Long Island Says
Reviews From Homes & Businesses We've Served
5 out of 5 stars
I highly recommend Neil from NJM. He is fast, courteous, reliable and professional. I hired him many times when I had issues at my home and also my office. Jobs as little as replacing a toilet, to rusted leaking pipes to installing a brand new central air conditioning system and new heating and ductwork.
Jeannette F.July 2024
5 out of 5 stars
Neil did work at my home and at my wife's business. In both cases, he had to replace a furnace. He did an excellent job in both cases. He was highly recommended to me and I would not hesitate to recommend him to anyone. Way to go Neil!
jacques laguerreFebruary 2022
5 out of 5 stars
NJM Mechanical Inc are awesome!!!!! Just Had a maintenance call / yearly service. Always professional prompt service. I had Neil as my service tech - great job.
Dan O.July 2026
Need Commercial Cooling Solutions?
Free estimates with no obligation, 24/7 emergency response, and 22+ years serving homes and businesses across Nassau and Suffolk County.