Replace commercial rooftop HVAC equipment with the curb, crane, roof, power, gas, controls, condensate, shutdown, startup, and turnover requirements organized before the lift.
Commercial first
Planned commercial, multifamily, facility, and substantial component projects receive priority.
Interfaces included
Adjacent roofing, HVAC, electrical, plumbing, concrete, and exterior conditions stay visible when they affect the scope.
Written project basis
Verified conditions, assumptions, allowances, exclusions, approvals, schedule logic, and closeout are documented.
The intended outcome
A commercial proposal is more useful when it starts with the property, operating outcome, known conditions, and acceptable assumptions—not only a unit price.
Existing nameplate data is a starting point, not a complete design. Building use, operating problems, distribution, ventilation, controls, utilities, envelope changes, and available load information shape the replacement basis.
Crane location, delivery route, roof access, parking, overhead conditions, tenant entrances, public protection, unit removal, weather, and lift timing are reviewed before a date is promised.
Curbs, roofing, duct transitions, power, disconnects, gas, condensate, controls, fire-alarm interfaces, testing, balancing, startup, and owner training receive named responsibility in the proposal.
Commercial Rooftop Unit Replacement scope
Final inclusions depend on field conditions, available information, required design, the jurisdiction, responsible trade parties, and the approved proposal. These are the elements the review should make explicit.
Unit count, model and serial information, capacity, fuel, voltage and phase, curb dimensions, duct arrangement, controls, outside air, known failures, service history, and accessible site conditions establish the replacement starting point.
The scope distinguishes verified selection criteria from assumptions about load, occupancy, ventilation, distribution, envelope, internal equipment, and future use. Design or engineering needs are identified rather than hidden inside “like-for-like.”
Existing curb compatibility, adapter needs, supply and return openings, sheet-metal transitions, structural or dimensional constraints, flashing limits, temporary openings, and weather protection are reviewed before procurement.
Lift radius, setup area, delivery, parking restrictions, overhead conditions, barricades, roof paths, staging, unit disposal, weather limits, and restoration responsibilities are connected to the property’s operating plan.
Electrical capacity, feeders, disconnects, gas, venting, condensate, thermostats, sensors, control sequences, economizers, outside air, equipment interfaces, and fire-alarm shutdown requirements are assigned and verified.
Manufacturer startup, operational checks, control verification, testing and balancing where included, filter and belt information, training, product data, warranty registration, photos, and final records complete the defined replacement.
Before comparing bids
These questions influence system selection, allowances, schedule, responsible parties, operational risk, and whether two proposals are actually pricing the same outcome.
Changes in occupancy, internal loads, ventilation, envelope, distribution, controls, utility capacity, or operating expectations can make a nameplate match incomplete. The responsible basis of selection should be documented.
Unit footprint, supply and return openings, curb height, roof assembly, adapter geometry, structural conditions, drainage, service clearances, and manufacturer details affect whether a curb can remain.
Critical areas, tenant hours, refrigeration, ventilation, process loads, security, IT, and weather conditions influence shutdown windows, temporary measures, phasing, and restart responsibilities.
Equipment availability, approved selection, submittals, controls, curb or adapter fabrication, electrical gear, utility work, permits, crane access, and seasonal demand may all govern the credible schedule.
Information that improves the review
Complete information reduces contingency and exposes dependencies early. Send what is available; missing conditions can be identified before responsible pricing.
Connected building systems
Vulcan remains focused on roofing, HVAC, electrical, plumbing, concrete, and exteriors. Connected work is coordinated only when it is expressly included in the approved project.
Unit removal, curbs, temporary openings, flashing, roof protection, membrane sequencing, penetrations, drainage, and warranty responsibilities can be planned together when the roof is also being replaced.
Voltage, phase, minimum circuit ampacity, overcurrent protection, feeders, disconnects, controls, available service capacity, shutdowns, inspection, and energization are checked against the approved equipment.
Gas, condensate, drains, equipment connections, ground-mounted pads, housekeeping slabs, dimensions, elevations, anchorage information, curing, and setting sequence are included only when expressly listed in the project scope.
A clearer commercial proposal
The final proposal—not this page—controls the work. Confirm limits, responsible trade parties, approvals, assumptions, allowances, schedule logic, changes, and turnover before award.
Existing and proposed units identified by capacity and key requirements
Selection basis plus load, ventilation, distribution, and controls assumptions
Curb, duct, roof, power, gas, condensate, controls, and fire-alarm responsibilities
Crane, delivery, access, protection, shutdown, temporary-condition, and phasing plan
Demolition, disposal, restoration, exclusions, allowances, alternates, and changes
Startup, testing, balancing where included, training, warranties, and closeout records
One accountable process
Share the property, current condition, target outcome, available documents, operating constraints, budget, and requested date.
The team reviews what is known, identifies what must be field-verified, and confirms whether the substantial planned scope fits Vulcan.
Limits, inclusions, interfaces, assumptions, allowances, exclusions, schedule logic, and change handling are organized before award.
Approved work moves through access, construction, communication, inspections, punch, photos, and useful turnover records.
Project fit
Vulcan prioritizes planned commercial and multifamily RTU replacements where equipment selection, lifting, roof interfaces, utilities, shutdowns, startup, and documented turnover need one coordinated plan.
Qualified residential whole-system replacements and substantial planned HVAC upgrades are considered through the broader HVAC service. Emergency no-cool or no-heat dispatch is not the focus.
Review all commercial hvac capabilitiesCommercial Rooftop Unit Replacement questions
No. Existing nameplate data is useful, but building use, occupancy, ventilation, distribution, envelope, internal loads, controls, utilities, performance problems, and future plans may affect the responsible replacement selection.
Crane, delivery, protection, and applicable permit responsibilities can be included in the written project scope. The actual requirements depend on the property, lift plan, jurisdiction, equipment, and responsible trade parties.
Possibly. Compatibility depends on dimensions, supply and return openings, height, roof assembly, adapter needs, structural conditions, drainage, service clearances, and the approved equipment and manufacturer details.
The proposal should assign each interface to the properly qualified responsible party. When those services are part of the approved Vulcan project, they can be coordinated in one sequence rather than left between separate schedules.
Downtime depends on unit count, phasing, curb and duct work, utilities, controls, inspections, weather, access, startup, and the needs of occupied areas. A shutdown window should be committed only after those conditions are reviewed.
Vulcan focuses on planned whole-system and rooftop-unit replacement, not emergency dispatch or isolated component repair. Submit the equipment information and target outcome so project fit can be confirmed.
Continue the commercial review
Parent service
Review the complete commercial capability, project-fit, and proposal guidance for this building system.
Connected project type
Plan a low-slope roof replacement around the existing assembly, drainage, rooftop equipment, occupied operations, access, weather exposure, and the closeout records ownership needs.
Connected project type
Plan commercial service, switchgear, distribution, and panel upgrades around verified loads, utility requirements, equipment lead times, critical operations, shutdowns, inspections, and energization.
Connected commercial service
Coordinate approved equipment-pad dimensions, elevations, anchorage information, curing, and setting sequence for ground-mounted equipment.
Greater St. Louis · projects reviewed for fit
Send the address, available documents, current condition, target date, and what must stay operational. Vulcan will review the RTU replacement scope and confirm next steps.
