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What Actually Drives the Cost of a Commercial RTU Replacement
When a packaged rooftop unit reaches end of life, the bare equipment is only part of the number. The curb fit, the crane and rigging path, the gas and electrical tie-ins, the controls integration, the efficiency tier you specify, and the realities of working over an occupied building all move the final figure — sometimes more than the unit itself. This guide breaks down the real cost drivers in a commercial RTU changeout across the NYC metro so building owners, property managers, and facilities directors can scope and budget with eyes open. Com+ Mechanical assesses the rooftop, identifies which drivers apply to your building, and turns them into a fixed, written proposal — not a guessed per-ton number.
Key Factors
Tonnage, capacity, and configuration of the unit
The size and type of unit is the foundation of the cost. Larger tonnage means more material and a heavier lift, and the configuration matters as much as the size: a gas/electric package, an all-electric unit, or a heat-pump rooftop each carry different equipment costs and tie-in requirements. Right-sizing to a real load calculation — rather than matching an oversized legacy unit — can also keep you from paying for capacity the building never needed.
Crane access, rigging path, and roof logistics
Often the single most variable line item. A ground-level crane set with a clear staging area is straightforward; a unit that requires a large crane reaching over a building, a street closure with NYPD-coordinated permits, a weekend or overnight lift, or a helicopter set on a constrained midtown roof changes the cost dramatically. Freight-elevator limits, roof-access routes, and protection for the membrane and occupied space below all feed into the rigging budget.
Curb fit and curb adapter fabrication
The new unit almost never matches the old footprint, so a custom curb adapter is usually fabricated to mate the new unit's supply and return openings to the existing duct penetrations. That adapter is a real cost — and if the existing curb is corroded through or structurally compromised, curb replacement and roofing work add to it. A clean curb reuse keeps the roof closed and the number lower; a failed curb drives it up.
Controls, BAS integration, and economizer scope
Tying the new unit into a building automation system — mapping points, matching sequences, integrating over BACnet or a comparable protocol — is engineering labor that a simple thermostat swap is not. Adding or upgrading an economizer for free cooling and ventilation compliance, new sensors, and demand-control ventilation all add scope. The more sophisticated your controls expectations, the more this driver contributes.
Efficiency tier, refrigerant, and electrical/gas infrastructure
A premium high-efficiency or variable-capacity unit with a higher IEER/SEER2 rating costs more up front than a baseline single-stage unit but can lower operating cost and Local Law 97 exposure over its life. Refrigerant matters too: phasing out legacy R-22 equipment and moving to R-410A or R-454B affects equipment selection. And if the new unit needs a larger electrical disconnect, upsized feeders, or gas-train modifications, that infrastructure work is its own cost driver.
Code, permits, and occupied-building logistics
NYC permitting, filings, and inspections add cost and schedule. Working over a tenant-occupied building means scheduling lifts and tie-ins around operating hours, after-hours labor, certificates of insurance for managed properties, and coordination with property management, security, and other trades. None of these touch the equipment itself, but together they meaningfully shape the total project cost.
Why Two RTU Replacements of the Same Tonnage Can Cost Very Differently
A commercial rooftop unit replacement is rarely a like-for-like swap, and that is exactly why a generic per-ton price tends to be wrong once a crew actually reaches the roof. Two buildings with identical 10-ton gas/electric units can land at very different costs depending on whether the new unit matches the existing curb footprint, how a crane reaches the roof, whether the gas train and electrical disconnect can be reused, what efficiency tier and refrigerant the new equipment uses, and how the unit must tie into a building automation system. Layer in NYC realities — street occupancy permits, after-hours lifts, freight-elevator and roof-access constraints, and Local Law 97 emissions pressure pushing owners toward higher-efficiency or electrified equipment — and the equipment line item becomes one variable among many. This guide explains each of the real cost drivers in plain terms so you can understand what you are paying for, where the money goes on your specific building, and which decisions (efficiency tier, single-stage vs. variable-capacity, gas vs. heat-pump) are worth weighing on lifecycle cost rather than first cost alone. Com+ Mechanical scopes every replacement after an on-site assessment so your budget reflects the curb, rigging, tie-in, and controls work your building genuinely requires.
How Com+ Helps You Decide & Execute
What You Gain From an Engineered RTU Replacement
Our Simple Process
From call to comfort in 4 easy steps
Rooftop Assessment & Load Verification
We survey the existing unit, curb, roof access, and rigging path, verify the cooling and heating load for the space, and review structural capacity plus electrical and gas conditions. This is where the real cost drivers for your building are identified — not assumed.
Options & Lifecycle Analysis
We lay out equipment options across efficiency tiers and configurations (single-stage vs. variable-capacity, gas/electric vs. heat-pump) and model first cost against operating cost and Local Law 97 exposure, so you can decide on value, not just sticker price.
Fixed-Scope Written Proposal
We translate the assessment into an itemized, fixed-scope proposal: equipment, curb adapter, crane and permits, tie-ins, controls integration, and commissioning. You see where the money goes before any work begins.
Execution & Commissioning
On approval, we handle demolition and disposal, set the curb adapter and unit, complete gas, electrical, condensate, and duct tie-ins, integrate controls, verify charge, balance airflow, and commission the unit with documentation for your records.
Types of Systems We Install
Gas/Electric Packaged Rooftop Units
The most common configuration on NYC commercial roofs — gas-fired heating with electric cooling in a single packaged cabinet. Cost is shaped by the gas-train tie-in, combustion safety work, and the heating capacity required.
- •Self-contained gas heat exchanger and burner section
- •Single-, two-stage, or variable cooling options that affect price and efficiency
- •Economizer-ready for free cooling and ventilation compliance
- •Requires gas-train tie-in and combustion safety checks, adding to tie-in cost
Electric/Electric & Heat-Pump Rooftop Units
All-electric packaged units, including heat-pump rooftops that provide both heating and cooling — increasingly specified for electrification and Local Law 97 goals. No gas tie-in, but electrical infrastructure can be the swing cost.
- •No gas connection or combustion venting required
- •Heat-pump models deliver heating and cooling from one system
- •Strong fit for buildings electrifying to cut carbon intensity
- •May require electrical service, feeder, or disconnect upsizing that drives cost
High-Efficiency & Variable-Capacity Rooftops
Premium packaged units with two-stage or variable-speed compressors and ECM blowers that modulate to load. Higher first cost, but lower operating cost and Local Law 97 exposure over the unit's life.
- •Variable or staged capacity matches output to demand
- •ECM/variable-speed supply fans for lower fan energy
- •Advanced onboard controls and BAS connectivity
- •Higher IEER/SEER2 ratings for operating-cost and compliance gains
Why NYC Property Teams Trust Com+ to Scope It
Commercial Rooftop Specialists
We focus on packaged rooftop systems for office, retail, and mixed-use buildings — curbs, adapters, rigging, and controls — so the cost factors we flag come from doing this work daily, not from a catalog.
Transparent, Fixed-Scope Pricing
We assess first and price in writing, with the curb, rigging, tie-in, and controls work itemized. No generic per-ton number that changes once we reach the roof, and no surprise change orders we could have foreseen.
Lifecycle, Not Just First Cost
We help owners weigh efficiency tier, configuration, and refrigerant on operating cost and Local Law 97 exposure, so the equipment decision is made on total value over the unit's life.
Built for Occupied Buildings
Crane lifts, gas tie-ins, and tenant-facing downtime are planned around your operating hours and building rules, coordinated with property management, security, and other trades to keep the building running.
Transparent Pricing
No fees. No surprises. Just honest service.
Assessment & Recommendation
A field survey of the existing RTU, curb, roof access, and load, delivered as a defined replacement scope with equipment and efficiency-tier options.
- On-site survey of unit, curb dimensions, and rigging path
- Cooling/heating load and structural capacity review
- Equipment, efficiency-tier, and configuration options
- Lifecycle vs. first-cost analysis
- Itemized written replacement proposal
Installation / Project
Turnkey changeout scoped from the assessment: demolition and disposal, curb adapter, crane set, gas and electrical tie-ins, controls integration, and commissioning.
- Old unit recovery, disconnect, and disposal
- Custom curb adapter fabrication and sealing
- Crane rigging, setting, and permit coordination
- Gas/electrical tie-in, charge verification, and BAS integration
- Full startup, airflow balancing, and commissioning
Ongoing Maintenance
Scheduled preventive maintenance on the new rooftop unit to protect the investment, hold efficiency, and extend service life across the building or portfolio.
- Seasonal cooling and heating inspections
- Coil cleaning, belt, and economizer service
- Filter changes and condensate/drain pan service
- Priority scheduling for agreement clients
- Documented unit condition reporting
These are engagement structures, not quotes. Final pricing for a rooftop unit replacement is confirmed in writing after an on-site assessment, scoped to tonnage, configuration, curb and rigging conditions, efficiency tier, and controls integration.
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
Why won't you just give me a per-ton price for an RTU replacement over the phone?
Because the equipment is only part of the cost, and the rest depends entirely on your building. Two identical-tonnage units can land at very different totals once you factor in crane access and rigging, whether a custom curb adapter is needed, the condition of the existing gas train and electrical disconnect, the efficiency tier you choose, and how the unit must integrate with your building automation system. A per-ton number quoted blind almost always changes once a crew reaches the roof. We assess first, then give you a fixed written price.
What is usually the biggest cost driver in a rooftop changeout?
It varies, but rigging and roof logistics are frequently the most variable. A simple ground-level crane set is one thing; a lift that requires a large crane reaching over a building, a street closure with permits, an after-hours or weekend window, or a constrained midtown roof can move the cost substantially. Curb condition is the other big swing — reusing a sound curb with an adapter keeps the roof closed and the number down, while a corroded curb adds roofing and structural work.
Does a higher-efficiency unit actually pay off, or am I just paying more up front?
It depends on your run hours and goals. A premium high-efficiency or variable-capacity unit costs more up front than a baseline single-stage model, but modulates to load instead of cycling, which lowers runtime and energy use over its life. For buildings with significant cooling hours, the operating-cost savings often justify the upgrade, and it reduces the building's carbon intensity under Local Law 97. We model first cost against operating cost during the assessment so the decision is made on lifecycle value, not just sticker price.
Will I have to replace the roof curb, or can the new unit reuse it?
In most replacements the existing curb stays and we fabricate a custom curb adapter so the new unit's supply and return openings line up with the existing duct penetrations, which avoids opening the roof. The adapter is a real cost line, but far less than full curb replacement. If the existing curb is corroded through or structurally compromised, we flag it during the assessment and scope the curb work so it does not surface later as a change order.
What costs catch building owners off guard on RTU replacements?
The ones that have nothing to do with the equipment: electrical disconnect or feeder upsizing when the new unit's requirements differ, gas-train modifications, controls and BAS integration labor, street occupancy permits, after-hours lift surcharges, certificates of insurance for managed properties, and disposal of the old unit including EPA-compliant refrigerant recovery. A proper assessment surfaces these up front so they are in the fixed proposal rather than discovered mid-project.
How does Local Law 97 factor into the replacement decision and cost?
Local Law 97 sets building emissions limits, and an aging single-stage rooftop unit with degraded coils consumes far more energy than modern two-stage, variable-capacity, or heat-pump equipment. Specifying a higher-efficiency or electrified unit raises first cost somewhat but lowers energy use and the building's carbon intensity, which directly affects your emissions calculations and potential penalties. We can specify replacement equipment with that compliance target in mind and model the trade-off as part of the recommendation.
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Get a Real RTU Replacement Number for Your Building
Stop budgeting off a generic per-ton estimate. Com+ Mechanical will assess your rooftop, identify which cost drivers actually apply — curb fit, rigging, tie-ins, efficiency tier, controls, and code — and deliver a fixed, written replacement proposal built around your building, your tenants, and your schedule. Serving property managers, owners, and facilities teams across the NYC metro.
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