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Commercial Chiller Installation & Replacement Across the NYC Metro
Replacing a central chiller is one of the largest mechanical projects a building will ever undertake, and there is no margin for a plant that doesn't make tonnage when the building loads up. Com+ Mechanical engineers, rigs, and commissions air-cooled and water-cooled chiller replacements for office towers, hospitals, data centers, hotels, and mixed-use properties across the five boroughs and surrounding metro. From a single packaged air-cooled unit on a setback to a centrifugal plant swap in a sub-cellar mechanical room, we handle the rigging path, the hydronic tie-in, the electrical service, the refrigerant transition, and the BAS integration end to end.
Signs Your Chiller Plant Is Due for Replacement
Aging machine still running R-22 or R-123 refrigerant
R-22 is phased out and R-123 (an HCFC) is in its production phase-down, so recharging a leaking machine is increasingly costly and uncertain. When an older centrifugal or reciprocating chiller needs frequent top-offs, a replacement on a low-GWP refrigerant such as R-1234ze or R-513A is the sounder long-term investment than chasing the leak.
Failed or unrepairable compressor on an older unit
A spun bearing, a failed hermetic motor winding, or a wiped centrifugal impeller on a 20-to-25-year-old machine often costs a large share of replacement value to rebuild, with no efficiency gain. At that age, a new high-efficiency chiller usually returns the investment through lower kW/ton and avoided downtime.
Rising kW/ton and inability to hold leaving-water temperature
Fouled tubes, worn compressors, and constant-speed operation force an older plant to run harder for the same tonnage, driving up demand charges. A modern variable-speed or magnetic-bearing chiller modulates to part load, where buildings spend most of their hours, and sharply lowers energy use and Local Law 97 carbon exposure.
Tube leaks, eroded tube sheets, or repeated approach-temperature problems
Pitted or eroded tubes in the evaporator or condenser bundle let water and refrigerant cross, kill heat transfer, and can flood the machine. Once the bundle is compromised on an aged shell, retubing may cost more than a new chiller that comes with a fresh, efficient heat exchanger.
Obsolete controls and no parts or factory support
When a chiller's microprocessor controls, starter, or proprietary boards are discontinued and the platform is no longer factory-supported, every fault means extended downtime and improvised fixes. Planned replacement on your schedule beats an emergency plant failure during a July heat wave.
Plant undersized or oversized for the building's current load
Tenant fit-outs, added IT and data load, or a change of use can leave a chiller chronically overloaded or badly oversized and short-cycling. A right-sized replacement, often a modular or multi-chiller arrangement, matches capacity to the real load and restores stable, efficient operation.
Central Chiller Plant Replacement, Engineered for the Building
A chiller replacement is a plant project, not an equipment swap. The new machine rarely matches the old footprint, the GPM, the pressure drop, or the electrical characteristics of the unit it replaces, so the chilled-water and condenser-water piping, the pumps, the starters or VFDs, and the controls all have to be reconciled before anything is rigged. Com+ Mechanical specializes in air-cooled and water-cooled chiller installation and changeout for commercial properties throughout NYC and the metro area, including scroll, screw, and centrifugal machines, magnetic-bearing oil-free chillers, and modular air-cooled banks. We begin with a load and plant assessment, then survey the rigging path, the structural slab or dunnage, the existing pumping and piping arrangement, and the refrigerant the building is leaving behind, often R-22, R-123, or R-134a, that today moves to low-GWP options such as R-1234ze, R-513A, R-514A, or R-32. From there we deliver a turnkey scope: demolition and EPA-compliant recovery and disposal of the old machine, rigging and setting, chilled-water and condenser-water tie-ins, refrigerant charge and leak testing, power and VFD connection, flow and temperature commissioning, and full integration to the building automation system. The result is a plant sized to the real block load, piped for proper flow and head, and proven to hold leaving-water temperature across the cooling season from the day we hand it over.
What a Com+ Chiller Installation Includes
Why Replace Your Chiller With Com+ Mechanical
Our Simple Process
From call to comfort in 4 easy steps
Plant Assessment & Load Verification
We survey the existing chiller, the chilled-water and condenser-water piping, the pumps, and the electrical service, then verify the building's block load and right-size the replacement. You receive a defined scope, an air-cooled vs water-cooled recommendation, and equipment selection sized to the building, not a like-for-like guess.
Engineering, Rigging Plan & Submittals
We engineer the tie-ins and pumping, produce submittals and a phasing plan, and lay out the rigging path, including crane picks, street occupancy permits, dunnage, or machine knockdown for tight mechanical rooms. Equipment, VFDs, and any pump or piping components are ordered and staged.
Demolition, Rigging & Tie-In
We recover the old refrigerant, isolate and demo the existing machine, and rig the new chiller into place. We complete chilled-water and condenser-water tie-ins, set isolation valves, strainers, and flex connectors, terminate power and the VFD/starter, and pressure-test the connections.
Commissioning & Handover
We verify refrigerant charge, prove flow and pressure drop, confirm leaving-water temperature across the load range, set chilled-water reset and safeties, and integrate the chiller to the BAS. You get a documented factory startup, a commissioning report, and an operator walkthrough before we leave the plant.
Types of Systems We Install
Air-Cooled Chillers
Packaged machines that reject heat directly to outdoor air through integral condenser coils and fans, with no cooling tower or condenser-water system. Common on rooftops and setbacks and a strong fit for small-to-mid plants where simplicity and lower water use matter.
- •No cooling tower, condenser pumps, or water treatment required
- •Scroll or screw compressors, often in modular banks for redundancy
- •Free-cooling and variable-speed options for part-load efficiency
- •Simpler operation and a smaller mechanical footprint
Water-Cooled Chillers
Machines that reject heat to a condenser-water loop served by a cooling tower, typically delivering lower kW/ton at scale. The standard for larger central plants in office towers, hospitals, and campuses with the space and infrastructure for a tower.
- •Higher full- and part-load efficiency than air-cooled at scale
- •Scroll, screw, or centrifugal compressors for a wide tonnage range
- •Requires cooling tower, condenser pumps, and water treatment
- •Best fit for large central chilled-water plants
Centrifugal & Magnetic-Bearing (Oil-Free) Chillers
Large-tonnage centrifugal machines, including oil-free magnetic-bearing designs that eliminate the oil-management system and excel at part load. Specified for high-capacity plants and projects targeting the lowest possible kW/ton and Local Law 97 performance.
- •Very high efficiency, especially at part load
- •Magnetic-bearing models remove oil and reduce maintenance
- •Variable-speed drives for demand-charge and energy savings
- •Available on low-GWP refrigerants for future compliance
Why NYC Property Teams Choose Com+ Mechanical
Central Plant Specialists
We focus on commercial chilled-water plants for office, healthcare, hospitality, and buildings, air-cooled and water-cooled, scroll through centrifugal. Your changeout is handled by a team that lives in mechanical rooms, not one that mostly does rooftop splits.
Built for Occupied Buildings
Rigging, refrigerant work, and plant downtime are planned around your operating hours, building rules, and cooling season. We coordinate temporary cooling, freight access, and other trades to keep tenants conditioned through the cutover.
24/7 Metro-Wide Response
Across the five boroughs, Nassau, Westchester, northern NJ, and Stamford, we keep replacement projects moving and respond to plant emergencies day or night..
Efficiency & Compliance Minded
We specify chillers with an eye to kW/ton, low-GWP refrigerant, and Local Law 97 emissions thresholds, helping owners replace aging, inefficient plants with machines that cut both demand charges and carbon exposure.
Transparent Pricing
No fees. No surprises. Just honest service.
Plant Assessment & Replacement Proposal
A field survey of the existing chiller, piping, pumps, rigging path, and electrical service, delivered as a defined replacement scope and equipment recommendation.
- On-site survey of machine, mechanical room, and rigging path
- Block-load, GPM, and electrical service review
- Air-cooled vs water-cooled and low-GWP refrigerant options
- Itemized written replacement proposal
Chiller Replacement & Installation
Turnkey changeout: recovery and demolition, rigging and setting, hydronic and electrical tie-ins, refrigerant charge, controls integration, and factory commissioning.
- Old machine recovery, demolition, and disposal
- Rigging, setting, and crane/permit coordination
- Chilled-water and condenser-water tie-ins and pump/VFD coordination
- Refrigerant charge, leak test, power termination, and BAS integration
- Factory startup, hydronic balancing, and full commissioning
Chiller Maintenance Agreement
Scheduled preventive maintenance on the new and existing plant to protect the investment, hold efficiency, and extend service life.
- Annual and seasonal chiller inspections
- Tube cleaning, eddy-current testing, and oil/refrigerant analysis
- Log and trend review of approach, kW/ton, and pressures
- Priority scheduling for agreement clients
- Documented plant condition reporting
All pricing is scoped after an on-site plant assessment, because rigging access, hydronic and electrical conditions, refrigerant transition, and controls integration vary by building and drive the real cost. Pricing is presented as a fixed written proposal before any work begins..
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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Planning a Chiller Replacement? Let's Scope the Plant Right.
Whether you're replacing one failed air-cooled unit or planning a centrifugal plant changeout across a portfolio, Com+ Mechanical delivers the assessment, the rigging plan, the hydronic and electrical tie-ins, and the commissioning under one accountable contractor. Get a written, fixed-scope proposal built around your building, your tenants, your cooling season, and your Local Law 97 targets.
Request Your Chiller Assessment