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Commercial HVAC Installation for Whole Buildings Across the NYC Metro
Whether you're replacing an end-of-life rooftop fleet, repiping a chiller plant, electrifying a boiler room, or building out HVAC for a new tenant fit-out, the install has to land on schedule, on budget, and without taking the building offline. Com+ Mechanical is the single commercial HVAC contractor that engineers, installs, and commissions every system in your building — RTUs, chillers, boilers, VRF, air handlers, ductwork, and controls — across the five boroughs, Nassau, Westchester, northern NJ, and Stamford CT. One scope, one accountable team, from load calculation to final commissioning.
When Buildings Call Us for a New HVAC Installation
Aging plant at end of service life
Rooftop units, chillers, or boilers past 15–25 years run on obsolete refrigerants and single-stage components, fail more often, and have no parts support. A planned capital replacement on your schedule beats an emergency failure during peak heating or cooling season.
Repeated breakdowns and rising operating cost
When repair tickets and energy bills both keep climbing, the building has usually crossed the point where replacement pays back. We run a repair-vs-replace analysis so the capital decision is based on real numbers, not guesswork.
Tenant fit-out or change of use
A new tenant, a lab or kitchen build-out, or a floor converting from office to assembly changes the load, ventilation, and zoning. New or reconfigured HVAC — often VRF or dedicated RTUs with proper outside-air — has to be designed and installed to the new occupancy.
Local Law 97 emissions exposure
Buildings over 25,000 sq ft facing LL97 emissions limits often can't comply with aging gas-fired and inefficient equipment. Heat-pump rooftops, VRF, and high-efficiency electrified plant lower carbon intensity and operating cost while moving the building toward its target..
Undersized or oversized legacy equipment
Systems sized decades ago for a different layout short-cycle or can't hold setpoint on design days. A fresh load calculation right-sizes the replacement so it runs efficiently and actually maintains comfort across the building.
New construction or major renovation
Ground-up builds and gut renovations need a complete HVAC system engineered and installed from scratch — plant, distribution, ventilation, and controls — coordinated with the GC and the other trades on a construction schedule.
Turnkey Commercial HVAC Installation, Engineered for Occupied Buildings
A whole-building commercial HVAC installation is a coordination problem as much as a mechanical one. New equipment rarely matches the old footprint, loads have changed since the original design, the electrical service and gas train have to be reconciled, and tenants are occupying the floors the whole time. Com+ Mechanical handles commercial HVAC installation and replacement as a complete project — central plant and packaged systems alike — for office towers, retail, mixed-use, industrial, healthcare, and multifamily properties throughout the NYC metro. We install and replace packaged rooftop units (RTUs), air-cooled and water-cooled chillers, hot-water and steam boiler plants, VRF/VRV systems, air handlers and makeup-air units, hydronic and refrigerant piping, sheet-metal distribution, and the building automation that ties it all together. Every project starts with a Manual N / block-and-room load calculation and a field survey of the existing infrastructure — structural capacity, rigging paths, electrical and gas availability, riser space, and the condition of what's staying — so the equipment we specify actually fits the building and the budget. From there we deliver a turnkey scope: demolition and EPA-compliant refrigerant recovery, equipment procurement, rigging and crane sets, mechanical and electrical tie-ins, controls integration, balancing, and full startup and commissioning. The result is a system sized to the real load, integrated with your BAS, phased around occupancy, and documented so your facilities team and the next inspector both know exactly what was installed.
What a Com+ Whole-Building Installation Includes
Why Install With Com+ Mechanical
Our Simple Process
From call to comfort in 4 easy steps
Assessment & Load Engineering
We perform a block-and-room load calculation, survey the existing equipment and infrastructure, and confirm structural capacity, rigging paths, and electrical and gas availability. You receive a defined scope and equipment selection sized to the building — not a generic per-ton number.
Design, Submittals & Scheduling
We finalize equipment selection, produce submittals and coordination drawings, procure long-lead equipment, and sequence the work. Crane lifts, permits, roof protection, and shutdowns are scheduled around tenant hours and the building calendar.
Installation & Tie-In
Old equipment is recovered and removed; new plant and distribution are rigged, set, and connected. We complete piping, gas, electrical, condensate, and ductwork tie-ins, then pressure-test and verify every connection before energizing.
Commissioning & Handover
We balance air and water to design, integrate controls with the BAS, run every system through heating and cooling modes, and verify performance. You get documented startup reports, balancing data, and O&M manuals, plus a full walkthrough with your team.
Types of Systems We Install
Packaged & Rooftop Systems (RTUs)
Self-contained gas/electric and electric/electric rooftop units and heat-pump packages — the workhorses of NYC office, retail, and mixed-use roofs, installed with curb adapters, crane sets, and controls integration.
- •Single- and multi-unit rooftop changeouts on existing curbs
- •Gas/electric, electric/electric, and heat-pump configurations
- •Economizer setup and outside-air ventilation compliance
Central Plant (Chillers & Boilers)
Air-cooled and water-cooled chiller plants and hot-water or steam boiler systems for larger buildings — engineered piping, pumps, cooling towers, and primary/secondary distribution.
- •Air-cooled and water-cooled chiller installation and replacement
- •Hot-water, condensing, and steam boiler plant builds
- •Hydronic piping, pumps, VFDs, and water treatment
VRF, Air Handling & Ventilation
Variable refrigerant flow systems, air handlers, and makeup-air units for zoned comfort, tenant fit-outs, and dedicated ventilation — with refrigerant piping and DDC controls.
- •VRF/VRV heat-pump and heat-recovery systems for zoning
- •Air handlers, fan coils, and makeup-air units
- •Refrigerant piping, condensate, and BAS integration
Why NYC Property Teams Choose Com+ Mechanical
Whole-Building Commercial Specialists
We install and integrate every commercial system — packaged rooftop, central chiller and boiler plant, VRF, and air handling — for office, retail, mixed-use, and industrial buildings. One team owns the entire mechanical scope, so nothing falls between trades.
Built for Occupied Buildings
Crane lifts, plant shutdowns, and tenant-facing downtime are planned around your operating hours and building rules. We coordinate with property management, security, and the other trades to keep the building running throughout the project.
24/7 Metro-Wide Response
Across the five boroughs, Nassau, Westchester, northern NJ, and Stamford, we keep installation projects moving and respond to emergencies on the systems we install..
Efficiency & Compliance Minded
We specify equipment with an eye to Local Law 97 emissions thresholds and operating cost, helping owners replace aging, inefficient systems with high-efficiency and electrified plant that reduces both runtime and carbon exposure.
Transparent Pricing
No fees. No surprises. Just honest service.
Assessment & Engineered Proposal
A field survey and load calculation across the systems in scope, delivered as a defined installation scope, equipment recommendation, and efficiency options.
- On-site survey of existing equipment, infrastructure, and rigging access
- Block-and-room load calculation and structural/electrical review
- Equipment selection with efficiency and electrification options
- Itemized written installation proposal and submittals
Whole-Building Installation & Replacement
Turnkey installation across all systems: demolition and disposal, rigging and crane sets, mechanical and electrical tie-ins, controls integration, balancing, and commissioning.
- Old equipment recovery, disconnect, and EPA-compliant disposal
- Crane rigging, setting, and street-permit coordination
- Piping, gas, electrical, and ductwork tie-ins across systems
- BAS/DDC integration and sequence programming
- Air/water balancing, full startup, and commissioning
Post-Install Maintenance Agreement
Scheduled preventive maintenance on newly installed and existing systems to protect the capital investment, hold efficiency, and extend service life across the building.
- Seasonal cooling and heating inspections on all systems
- Coil, burner, economizer, and water-treatment service
- Filter changes and condensate/drain service
- Priority scheduling for agreement clients
- Documented building-wide condition reporting
All pricing is scoped after an on-site assessment and load calculation, because system mix, rigging access, electrical and gas conditions, 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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Frequently Asked Questions
Get answers to common questions about our services
Can one contractor really handle every system in our building?
Yes — that's the model. Com+ Mechanical installs packaged rooftop units, air-cooled and water-cooled chillers, hot-water and steam boiler plants, VRF systems, air handlers, makeup-air units, ductwork, and the building controls that tie them together. You get one engineered scope and one accountable team instead of coordinating a separate rigger, sheet-metal shop, controls vendor, and mechanical contractor yourself, which is where most building projects lose schedule and budget.
Will you size the new equipment, or just match what's there?
We start every installation with a block-and-room load calculation rather than copying the old nameplate. Loads change as buildings are renovated, re-tenanted, and re-glazed, so legacy equipment is frequently oversized (short-cycling and wasting energy) or undersized (never holding setpoint on design days). Right-sizing the replacement is what makes the new system efficient and reliable, and it's documented in the proposal.
How do you keep the building running during the installation?
We phase the work around occupancy. Crane lifts, plant shutdowns, and tie-ins are scheduled for off-hours or low-occupancy windows, temporary or redundant equipment keeps critical areas served, and we coordinate with property management, security, and the other trades so tenants see minimal disruption. The phasing plan is part of the scope you approve before we start.
Can you install across a portfolio of buildings on a capital plan?
Yes. We regularly handle multi-system, multi-site installation programs for property managers and owners with portfolios across the NYC metro — standardizing equipment, phasing the work, and staging a capital replacement schedule so each building is upgraded on plan rather than waiting for systems to fail one by one. One vendor across the portfolio also keeps controls and documentation consistent from building to building.
How does a new system help with Local Law 97 and energy costs?
Aging gas-fired and single-stage equipment consumes far more energy and carries higher carbon intensity than today's high-efficiency and heat-pump systems. Replacing end-of-life plant with electrified rooftops, VRF, or high-efficiency chillers and boilers lowers electricity and gas use and reduces the building's emissions, which directly affects Local Law 97 calculations. We specify equipment with that compliance goal in mind..
Do you carry insurance and provide a COI for managed properties, and do you offer 24/7 support after install?
Yes. We carry commercial insurance and provide certificates of insurance to satisfy managed-building and ownership requirements, and we respond 24/7 across the five boroughs, Nassau, Westchester, northern NJ, and Stamford on the systems we install..
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Planning a Commercial HVAC Installation or Upgrade?
From a single rooftop changeout to a whole-building plant replacement or a portfolio-wide capital program, Com+ Mechanical delivers engineered, turnkey installation across the NYC metro — sized to your load, phased around your tenants, and built to comply. Talk to our commercial team about your building or portfolio and get a scoped, written proposal.
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