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Commercial Packaged Unit Replacement Across NYC & the Metro
When a rooftop unit is past economical repair, a planned changeout protects tenant comfort and your operating budget. Com+ Mechanical engineers, rigs, and commissions packaged RTU replacements for office, retail, industrial, and mixed-use buildings across the five boroughs, Nassau, Westchester, northern NJ, and Stamford.
Signs Your Packaged Units Are Due for Replacement
Repeat compressor failures
A second or third compressor replacement on the same RTU signals a unit at the end of its life. Continued repairs on an aging cabinet rarely return the investment, and lead times on legacy compressors leave tenant spaces warm for days.
Chronic refrigerant leaks on an R-22 or R-410A unit
Corroded condenser or evaporator coils that need annual top-offs are a losing proposition. R-22 is phased out and costly, and with the 2025 A2L transition, repeated leak-chasing on older circuits is money spent on borrowed time.
Rust-through, corroded cabinet, or failing heat exchanger
Salt air and ponding water rot RTU cabinets, base rails, and gas heat exchangers. A cracked heat exchanger is a combustion-safety issue, and a corroded base risks structural and water-intrusion problems on the roof.
Rising energy spend and weak capacity
A 15-to-20-year-old unit at a 10–11 EER works far harder than a modern high-IEER replacement to hold setpoint. Tenants feel it as uneven temperatures while you see it as climbing kWh and demand charges.
Short-cycling and humidity complaints
An oversized or worn unit that starts and stops constantly never pulls latent load, leaving sticky, clammy tenant spaces. It also hammers contactors and compressors, accelerating the next failure.
Obsolete unit with no parts support
When the manufacturer has discontinued boards, blower assemblies, or economizer actuators, every breakdown becomes an extended outage. Planned replacement ends the scramble for unobtainable parts.
Planned Packaged Unit Changeouts That Minimize Tenant Disruption
Commercial packaged units — gas/electric and heat-pump rooftop units (RTUs) — bundle compressors, condenser coil, evaporator, supply blower, economizer, and heating section into a single curb-mounted cabinet. After 15 to 20 years of NYC weather, salt-air corrosion, and short-cycling, these units reach a point where chasing failed compressors, leaking coils, and obsolete R-22 or R-410A circuits costs more than they are worth. A replacement restores reliable conditioning to the tenant spaces below, cuts the energy draw on your bill, and resets the maintenance clock. Com+ Mechanical manages the full scope for property managers and building owners: load verification, unit selection, DOB-compliant crane rigging and curb adaptation, refrigerant and controls tie-in, and start-up commissioning. We work around occupancy — staging swaps for off-hours, weekends, or shoulder seasons so retail floors, offices, and tenants stay conditioned and the elevator-lobby complaints never start.
What a Com+ Packaged Unit Replacement Includes
Why Replace Rather Than Keep Repairing
Our Simple Process
From call to comfort in 4 easy steps
Rooftop survey and assessment
We inspect the existing units, measure the curb and duct openings, check roof access and structural load path, verify electrical and gas service, and confirm the served zones — then document what a clean changeout requires.
Engineered proposal and unit selection
You receive a scoped proposal: right-sized unit make/model, efficiency tier, curb-adapter approach, crane and permit plan, and a phasing schedule built around your building's occupancy and Custom Quote pricing.
Scheduled changeout and rigging
On the agreed off-hours or weekend window, we recover refrigerant, disconnect services, crane out the old unit, set the replacement on the adapted curb, and make all gas, electrical, condensate, and duct connections.
Commissioning and handoff
We charge and leak-test the circuit, balance airflow, configure the economizer and BAS controls, run heating and cooling through every stage, restore roof flashing, and hand off as-left documentation for your records.
Types of Systems We Install
Gas/Electric Rooftop Units (RTUs)
The workhorse of commercial buildings — packaged cooling with a gas-fired heating section serving offices, retail, and mixed-use spaces. We replace single-zone constant-volume units and multi-stage models on the existing or adapted curb.
- •Gas-train connection and combustion leak test
- •Right-sized capacity with multi-stage cooling options
- •Economizer for free-cooling on mild NYC days
- •Curb-adapter set to existing duct openings
Packaged Heat Pumps
All-electric rooftop heat pumps that cool and heat from one cabinet — an increasingly common replacement choice for buildings electrifying toward Local Law 97 targets and dropping a combustion source from the roof.
- •Single-cabinet heating and cooling, no gas line
- •Low-GWP A2L refrigerant ready
- •Supplemental electric heat where needed for design temps
- •Controls integration for occupied/unoccupied scheduling
Packaged DX with DDC Controls
Larger packaged DX units tied into a building automation system for multi-tenant scheduling, demand control, and remote diagnostics — replaced and re-integrated so your BAS sees the new unit on day one.
- •BAS/DDC integration and point mapping
- •Variable-capacity compressors for part-load efficiency
- •Demand-controlled ventilation tie-in
- •Remote monitoring and fault reporting
Why Property Managers Choose Com+ Mechanical
Commercial rooftop specialists
We work on RTUs, not residential split systems. Our crews handle curb adapters, crane lifts, gas-train tie-ins, and DDC integration as routine — the realities of a real rooftop changeout in the city.
NYC logistics handled end to end
Street-level crane staging, sidewalk and DOB permitting where required, off-hours building access, and freight-elevator and roof-protection coordination — we manage the New York details that derail unprepared contractors.
Portfolio-ready execution
Managing aging RTUs across multiple buildings? We standardize unit selection, phase replacements across your portfolio, and keep documentation consistent so your capital plan stays on track.
Right-sized, not oversized
We verify the actual load on each zone before specifying a unit, so you get correct capacity and dehumidification — not a bigger box that short-cycles and runs up the bill.
Transparent Pricing
No fees. No surprises. Just honest service.
Replacement Assessment & Proposal
On-site rooftop survey to scope the changeout and define the path to a clean replacement.
- Existing-unit and curb/duct-opening inspection
- Load verification for the served zone
- Roof access, structural, and crane-staging review
- Electrical, gas, and controls service check
- Engineered scope with right-sized unit recommendation
Packaged Unit Changeout
Turnkey removal and replacement of the rooftop packaged unit, rigged and commissioned.
- EPA-compliant refrigerant recovery and old-unit removal
- Crane rigging and permit coordination
- Curb adapter and new high-efficiency RTU set
- Gas, electrical, condensate, and duct tie-in
- Economizer and BAS/controls integration
- Full commissioning and as-left documentation
Post-Replacement Maintenance Agreement
Planned service that protects the new units and your warranty across the portfolio.
- Scheduled spring/fall RTU inspections
- Coil cleaning, belt/filter, and economizer checks
- Refrigerant and electrical performance verification
- Priority response for covered units
- Documented service history for capital planning
All packaged unit replacement pricing is scoped after an on-site rooftop assessment and provided as a Custom Quote — tonnage, curb adaptation, crane access, refrigerant type, and controls scope all affect the final number.
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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Frequently Asked Questions
Get answers to common questions about our services
How long does a rooftop packaged unit replacement take?
A straightforward like-for-like RTU changeout with a curb adapter is often a single-day lift once the crane and permits are staged; units needing duct modifications, structural work, or controls upgrades run longer. We confirm the realistic timeline in your proposal and schedule the lift for off-hours or weekends to keep tenant spaces conditioned.
Can you replace our units without disrupting tenants or building operations?
Yes. We stage changeouts for nights, weekends, or shoulder seasons and isolate the affected zone so the rest of the building stays conditioned. For occupied retail and office floors, off-hours rigging means tenants arrive to a working system and never see the crane.
Do you handle the crane, permits, and NYC logistics?
We do — lift planning, street and sidewalk crane permits where required, DOB coordination, roof-protection matting, and freight-elevator or roof-access scheduling. Managing New York's rigging and permitting details is part of the scope, not an afterthought you have to chase.
We have aging RTUs across several buildings. Can you handle the whole portfolio?
Absolutely. We assess every rooftop, standardize unit selection where it makes sense, and phase replacements across your portfolio so the capital spend is predictable and documentation stays consistent. One point of contact for every building.
What does a new packaged unit do for Local Law 97 and our energy bill?
Modern high-IEER units with ECM blowers and multi-stage or variable-capacity compressors use meaningfully less energy than a worn 15-to-20-year-old RTU to hold the same setpoint. That lowers your cooling kWh and demand charges and reduces source energy — which supports your building's progress toward its Local Law 97 emissions cap.
Do you offer 24/7 emergency support if a unit fails before we can replace it?
Yes — we provide 24/7 emergency response across the NYC metro to keep a failing unit limping until the planned changeout, and our crews can prioritize an expedited replacement when a unit is beyond saving. Call (332) 600-4640 any time.
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Plan Your Packaged Unit Replacement Before the Next Failure
Don't let an end-of-life RTU dictate your schedule with a mid-summer breakdown and a warm tenant floor. A planned changeout from Com+ Mechanical restores reliable conditioning, lowers your operating cost, and gives you a defined, budgetable project instead of an open-ended repair bill. Schedule a rooftop assessment for one building or your entire portfolio across the NYC metro.
Request a Replacement Assessment