Air Filters
Evaporator and Condenser Coils
Fan Blades and Motors
Condensate Drain Lines
Ductwork
Grilles and Registers
Refrigerant Lines
Outdoor & Indoor Units
Thermostat
Refrigerant Leaks
Compressor Issues
Fan Motor Problems
Thermostat Malfunctions
Blower Motor Issues
Capacitor Failures
Electrical Problems
Condenser Coil Problems
Evaporator Coil Issues
Expansion Valve Problems
Ductwork Issues
Heat Exchanger Problems
Water Leaks
Control Board Issues
Airflow Problems
Commercial HVAC, from the rooftop unit down to the last register
Commercial HVAC covers everything that conditions and moves air through a building you trade in: the packaged unit on the roof, the split system behind the shop, the make-up air that keeps a kitchen breathing, and the duct that carries it to the people in the room. Nine services sit under this one. Start with what you have.
What makes a commercial system a different animal
A house has one system, one thermostat and one household to please. A commercial building has staff, customers, stock, a landlord, and often an inspector with an opinion, and the equipment is built to match. Cabinets are sectioned so a technician can work on one part without dismantling the machine. Power is usually three phase. Blowers are belt driven with adjustable sheaves, so airflow gets set to the duct system it is actually feeding. Most units carry a gas heat section in the same cabinet as the cooling, so one box owns both seasons.
Ventilation is the other half. In a house, fresh air is mostly whatever leaks in. In a commercial building the outside air rate follows what the space is used for and how many people are in it, and it has to be delivered whether or not anyone feels uncomfortable. An office, a gym and a kitchen of the same square footage need very different machines for that reason alone.
Hiring a commercial HVAC company is a different exercise for the same reason: the work happens on roofs, above ceilings and in mechanical rooms, around a business that is still trading, on equipment a lease may or may not say is yours.
What a Long Island commercial building actually runs
Six architectures cover almost everything we are called to. Which one you have decides how a fault is found, how the work is scheduled, and what a replacement costs to put in place.
Packaged rooftop units
One sealed cabinet on a curb over an opening in the roof deck, conditioning the space directly beneath it. Single story retail, strip centers, restaurants and warehouses, where the roof is the only free floor space in the building. Sites often run several, one per zone or tenant. Nothing about a service visit enters the tenant space, since the whole machine is reached from the roof.
Split systems
Half the machine outdoors, half indoors, joined by a refrigerant line set. Offices, upstairs tenant spaces and older buildings with no roof opening or structural room for a packaged unit. Because the outdoor and indoor halves can be replaced independently, a split system is often the only practical route in a building nobody wants to open up.
Ductless multi-split systems
One outdoor unit feeding several indoor heads or fan coils, each with its own control. Buildings carved into small tenancies, IT rooms that need cooling when nothing else does, and additions where running new duct was never possible. Each head runs only when its own space needs it, which suits a building whose tenants keep different hours.
Zoned duct systems
One air source, several zones, motorized dampers and zone thermostats deciding who gets air and when. What lets a single unit serve a sales floor and a back office whose loads have nothing in common. The trade-off is that a zone is only as good as the damper and the sensor controlling it.
PTAC and through-wall units
Self contained cabinets in a wall sleeve, one per room, each with its own controls and its own condenser facing the street. Hotels, apartment buildings, assisted living and small office suites, where a failure takes out one room, not a floor. Controls sit in the room, so each occupant sets their own temperature with no zoning system behind it.
Make-up air and exhaust
The supply side of ventilation and the fans that pull heat, grease, fumes and moisture back out. Kitchen hoods, bathroom and warehouse exhaust, mechanical room ventilation. None of it is comfort equipment and none of it is optional. Sizing it is a balance problem across the whole building, never a specification for one fan.
Nine services. Start from what you have.
Pick the situation closest to yours. You get what that system is, how it behaves, and the service that owns the work, named at the end of the panel.
Not sure which one you have? Describe what you can see and we will place it. 631-710-6257
A packaged rooftop unit
The whole machine sits on a curb, and the curb is a framed opening in the roof deck with supply and return duct dropping through it. Everything a technician needs is inside one sectioned cabinet, which is why a rooftop fault is worked in a set order: power and control voltage, then the section matching the symptom, then the airflow everything else depends on.
Access is the part owners underestimate. Reaching the unit safely, in weather, with the gauges and parts needed, is part of the job, and it is settled before the first tool goes up.
That work is rooftop unit repair, with commercial HVAC repair and commercial HVAC maintenance alongside it.
A split system
An outdoor condensing unit, an indoor air handler or furnace, and a refrigerant line set joining them. The two halves fail for different reasons, so telling us which end the noise, the smell or the water is coming from can save a visit on its own.
Splits also carry a matching problem no packaged unit has. Outdoor unit, indoor coil and metering device all have to belong to each other, and where one half was replaced years before the other, that mismatch is often the real reason a system underperforms while every individual part tests fine.
That is commercial HVAC repair, and where the halves no longer match, commercial HVAC installation.
A kitchen with an air balance problem
A commercial kitchen is a ventilation problem before it is a comfort problem. The hood pulls a large volume of air out of the building and something has to put the same volume back. When make-up air is undersized, failed, or has quietly been switched off, the kitchen goes negative. The hood stops capturing at its edges, smoke rolls out under the canopy, exterior doors pull hard against you, and atmospheric appliances start to backdraft.
Turning the air conditioning down will not fix that, because the cooling is fighting a fan moving several times as much air as it can condition. Exhaust and make-up air come first, comfort second.
That is restaurant HVAC, and the fans and ductwork behind it are ventilation and exhaust systems.
Uneven temperature across a building
Rooms that fight each other are almost always a distribution problem, not a capacity problem, and adding equipment before proving that is an expensive mistake. On a zoned duct system it is usually a damper that has stopped traveling, a zone thermostat reading a space it does not control, or a bypass arrangement dumping supply air straight back into the return. On a building running PTACs it is often one dead cabinet in a row of working ones.
The fault gets found by measuring air at the registers and working back up the branch, not by moving setpoints. Where the sensor itself is mounted decides more than most owners expect: put one over a copier or in afternoon sun and the whole floor takes the consequences.
That is commercial HVAC repair, and on a system that has drifted out of balance, commercial HVAC maintenance.
Weak airflow, dust at the registers, a smell when the fan starts
These are duct side symptoms and the cheap checks come first: filter condition and the right filter for that equipment, flexible duct crushed or kinked above a ceiling, a blower wheel packed with dirt, and a return blocked with stock or furniture. A loaded blower wheel moves less air every month it is left, and it is rarely the first thing anyone checks.
After that it is the duct itself: interior condition, joints separated above a ceiling, liner that has come away, insulation sweating in an unconditioned space. Duct is the path everything in the building travels, which is where air quality complaints get resolved.
That is commercial duct cleaning, and where fans and outside air are involved, ventilation and exhaust systems.
A replacement rather than a repair
A change-out is a project with a permit, a lift and a schedule attached to it, not a service call. What decides it is the cost of the repair set against the remaining service life of the machine, whether the refrigerant it runs on is still practical to buy, and whether the existing curb, duct and electrical service can carry a current unit without being rebuilt.
On a rooftop the existing curb usually survives the change, which is what keeps the work to a lift and a connection instead of a roofing job. Off-hour and overnight work is standard on commercial replacements, because the point is that the business keeps trading through it.
That is commercial HVAC installation, or rooftop unit installation when the machine is coming off a roof.
It is down and you are open tomorrow
Out of hours the first job is triage: whether the building is safe, whether anything else in it is now at risk, and what can be made to run tonight so the doors open in the morning. Calls are answered at any hour, holidays included, and typical on-site response across Suffolk and Nassau County is inside 90 minutes.
Three things make that call faster: where the equipment is and how it is reached, what it is doing or failing to do, and whether anything has tripped. That decides which truck goes out and what is on it.
That is emergency HVAC repair, and it becomes commercial HVAC repair once the building is safe again.
Commercial HVAC repair
The diagnostic method and the component by component fault list, across every system type we service.MatchesView service 02Emergency HVAC repair
After-hours failure, how a call is triaged, and what happens overnight before you open.MatchesView service 03Commercial HVAC installation
Scope, load sizing, permitting and the sequence a commercial install actually runs in.MatchesView service 04Commercial HVAC maintenance
Scheduled service and maintenance agreements, and what each visit covers season by season.MatchesView service 05Rooftop unit repair
The RTU as a machine: the curb, the sections inside the cabinet, and how each one is reached.MatchesView service 06Rooftop unit installation
Crane and rigging, curb adapters, and how a lift day is planned around a trading business.MatchesView service 07Restaurant HVAC
Kitchens specifically: hoods, make-up air, pressure balance and comfort on a hot line.MatchesView service 08Ventilation and exhaust systems
Supply and exhaust fans, outside air, and how air is actually moved through an occupied building.MatchesView service 09Commercial duct cleaning
Duct condition, inspection and cleaning, and when a duct system is the reason for the complaint.MatchesView service
What a commercial job takes that a house call does not
Getting to the equipment is the first difference. Roof access can be an interior hatch, a fixed ladder, or a lift brought to site, and it is settled before anyone carries a recovery machine up it. A unit sitting a few feet from the roof edge changes how the work is set up, not whether it happens.
A change-out is a lift. That means a crane or a boom truck with somewhere legal to set up, a clear path for the boom, and an exclusion zone under the swing that stays clear for the duration. On a strip center lot the window for that is usually early morning before the stores open, so the lift gets booked around the tenants.
Permits are pulled with the town the building sits in, and Long Island towns each run their own building department with their own submission and inspection habits. Every installation we do is permitted and presented for inspection, and the paperwork comes with the work.
The same approach across all nine services
Four things hold true whichever of the nine you need.
One contractor for the whole building
The trucks that service your rooftop units also service the walk-in in the back. A restaurant or a grocery store calling about commercial refrigeration and calling about air conditioning is calling the same company, which is one relationship and one history of the site instead of two.
Answered when it fails
Equipment does not pick a Tuesday morning to fail. It picks a Friday night, a long weekend, or the hottest week of the summer, and a business that trades at the weekend cannot wait until Monday. Emergency cover runs every day of the year, and the number that takes a quote request is the number that answers at two in the morning.
Certified and permitted
Licensed and insured, with technicians holding EPA Section 608 certification for refrigerant handling and factory training across the major HVAC and refrigeration brands. Trucks are stocked with the common failure parts for those brands, so a straightforward fault does not wait on a supplier.
The repair or replace answer in plain terms
When a machine is worth repairing you get the repair. When it is not, both figures are put in front of you together, along with an honest read on how much service life the repair actually buys. That conversation happens on the roof, before anything is ordered, with the readings from the machine in front of both of us. The decision stays yours.
I have used Temperature Control at my place of business and for personnel use for over 15 years. Very easy to deal with. Prompt service. Personality says so much about a business and Larry and Alex know how to treat there customers, with a smile and a "no problem we'll take care of it" type of attitude. Would and have recommended them to so many people over the years. Everyone has always been happy.
What Long Island does to commercial equipment
Long Island is a sandbar with water on three sides, and salt air reaches a long way inland. On coastal sites the condenser coil is the first casualty: aluminum fins corrode, the bond between fin and tube degrades, and the coil rejects less heat than its label claims long before anything fails outright. Cabinet panels, fasteners and electrical enclosures go the same way, so coil condition is worth checking more often near the water, and coated coils are worth specifying on a replacement there.
Summers here are humid as much as hot, which puts real weight on the latent load, the moisture a system has to remove alongside the heat. That is where oversizing does its damage. A unit with more capacity than the space needs satisfies the thermostat quickly and shuts off, so the coil never runs long enough at a low enough temperature to pull water out of the air. The space reads cool on the thermostat and feels clammy, and the short cycling wears compressors and contactors. Sizing a commercial replacement from the building's real load, not from what was there before, is the decision with the longest consequences.
Winters get cold enough that a heat pump on its own reaches a point where it cannot keep up, so commercial heat pump work here is planned around a supplemental heat source. It is also why so many rooftop units on Long Island carry a gas heat section: one cabinet, both seasons, one curb, one lift.
Commercial HVAC questions we get asked most
Is the rooftop unit mine or the landlord's?
The lease decides that, and commercial leases split it in different ways. A common arrangement makes the tenant responsible for the unit serving their space while the landlord keeps the roof itself, though plenty do the opposite or share the cost above a threshold. Check the mechanical clause before you authorize work on a unit you may not own. We will tell you plainly which side of the roof deck the fault sits on, which is usually what settles it.
How often should a commercial system be serviced?
Most commercial equipment gets looked at twice a year: cooling checked before summer, heating checked before the first cold night. Run hours and environment move it from there. A rooftop unit over a kitchen, a coastal site, or a system running close to capacity all want more attention than an office unit that idles half the year. We set the interval after seeing the equipment.
Can you work outside our business hours?
Yes, and on commercial work it is usually the plan. Installations and change-outs are scheduled for evenings, overnight or before opening so the business keeps trading. Emergency service runs around the clock, holidays included. Office hours for quotes and planned work are Monday to Friday, 8am to 5pm.
Do you handle the permit and the inspection?
Yes. The permit is pulled with the town the building sits in, the work is done to be inspected, and the sign off is part of what you are buying. Unpermitted mechanical work surfaces during a sale, a refinance or a tenant fit-out, and the paperwork is far cheaper to have than to reconstruct.
Can you service the equipment we already have?
In almost every case, yes. Our technicians are factory trained across the major HVAC and refrigeration brands. Have the unit's data plate to hand when you call, because the brand and model tell us which failures are common on that machine and what needs to be on the truck.
Tell us what the building is doing
One call covers the whole category: a unit that will not start, a kitchen that will not clear, a system that has reached the end of its life, or a maintenance schedule that lapsed two owners ago. If it is failing right now, call. If it is a project, ask for a quote and we will come and look at the building.