Engineering-Grade HVAC Installation Built for NYC
From design-build and DOB permits to system commissioning and closeout — Denair delivers turnkey HVAC construction with zero surprises, on projects from $10K to $5M.
Everything from Estimating
to Closeout. In-House.
Our six specialized departments handle every phase of your HVAC project. No coordination gaps, no third-party surprises, no cost overruns.
Estimating
- Competitive, line-item bids
- Design-build solutions
- Value engineering alternatives
- DOB-compliant shop drawings
- Price-locked proposals
Installation
- Rooftop package units (RTUs)
- Split systems & air handlers
- VRF/VRV systems
- Crane & rigging coordination
- Full system commissioning
Ductwork
- Rectangular & oval duct
- Round spiral ductwork
- Black iron fabrication
- Custom fabrication in-shop
- Duct pressure testing
Piping
- Refrigerant line sets
- Condensate systems
- Chilled & condenser water
- Steam piping
- Pressure & leak testing
Controls & BMS
- Temperature & humidity control
- BMS / DDC integration
- 75F smart building automation
- Scheduling & zoning
- Energy optimization programming
Close-Out
- Air & water test & balance
- As-built drawings
- Warranty documentation
- Permits & DOB sign-off
- Preventative maintenance setup
Built Right. Every Borough.
19+ years of commercial HVAC installations across Brooklyn, Manhattan, Queens, The Bronx, and Staten Island. See our full project history.
From First Call to Final Signoff
Denair runs every phase in-house. Six specialized departments. One point of contact for you.
ahead of schedule
20% on time. Never late. That's the Denair track record across 19+ years of NYC HVAC projects.
Scope & Estimate
Your dedicated estimator reviews plans, walks the site if needed, and delivers a fully itemized, price-locked proposal — detailed to the cent.
Design-Build & Submittals
Our in-house team produces DOB-compliant shop drawings and submittals. We handle permit pulling — nothing falls on you.
Meticulous Installation
Certified crews with field supervision and dual quality control. Clean sites, precise execution, coordinated deliveries managed by our crew production team.
Test, Balance & Close-Out
Air and water test & balance, as-built drawings, warranty documentation, DOB sign-off, and free preventative maintenance enrollment for up to 18 months.
Every Commercial HVAC System.
Factory-Certified.
Denair holds factory certifications from leading OEMs — so the manufacturer stands behind the installation, not just the equipment.
VRF / VRV Systems
Variable refrigerant flow for multi-zone commercial buildings. Simultaneous heating & cooling, minimal ductwork, and BMS integration. Ideal for office buildings, retail, and mixed-use properties across Manhattan, Brooklyn, and Queens.
More on VRF System Installation →
Rooftop Package Units (RTU)
Self-contained rooftop units for commercial and light industrial buildings. Crane and rigging coordination included. NYC DOB sign-off handled in-house. Common in The Bronx, Brooklyn, and Queens industrial corridors.
DOAS & Air Handlers
Dedicated outdoor air systems and custom air handlers for high-occupancy commercial buildings, healthcare facilities, and spaces with strict IAQ requirements — common in Manhattan high-rises and co-ops.
BAS / BMS & Controls
Building automation and DDC controls that cut energy costs by 30% or more. We design, install, and commission 75F, Honeywell, and Johnson Controls platforms — with full LL97 compliance programming included.
More on HVAC Controls & BMS →
Chilled Water Systems
Central plant design-build for mid-rise and high-rise commercial buildings. Includes chiller installation, cooling towers, pumping systems, and full piping — with chemical treatment and commissioning.
Computer Room & Mission-Critical
Precision cooling for data centers, server rooms, and mission-critical environments. 24/7 emergency response included for all maintained systems. Uptime is the only acceptable outcome.
Five Boroughs.
One Standard of Work.
Every project — from a single rooftop unit to a full-building VRF system — executed with the same in-house rigor. Drag to explore.
Not All NYC HVAC Contractors
Are the Same
Most contractors hand you a price and disappear. Denair is your partner through every phase — with the documentation, certifications, and in-house depth to prove it.
| Capability | Denair HVAC | Typical NYC Contractor |
|---|---|---|
| In-house permit & DOB submittals | ✓ Included | Additional cost / outsourced |
| Price-locked proposals (no change orders) | ✓ Guaranteed | Common overruns |
| LL97 compliance scope built-in | ✓ Every project | Extra consultant required |
| Factory OEM certifications (Daikin, Trane, Carrier, LG) | ✓ 9 OEM brands | Varies / often none |
| Free preventative maintenance post-install | ✓ Up to 18 months | Not included |
| In-house ductwork fabrication | ✓ On-site custom fab | Subcontracted / delayed |
| Bonding capacity | ✓ $10,000,000 | Varies widely |
| 24/7 emergency service after install | ✓ Direct line | Answer not guaranteed |
Real outcomes for NYC
From Midtown office towers to Brooklyn mixed-use portfolios — delivered on time, on budget, and LL97-compliant.
Midtown Manhattan · VRF system retrofit
Aging RTUs failed mid-winter. Denair delivered a full VRF system — designed, permitted, and commissioned in under four weeks. Every DOB submission handled in-house. Zero change orders.
Reduction in energy costs
Post-installation, year-over-year
Project value, delivered on budget
Zero change orders start to finish
Carroll Gardens, Brooklyn · LL97 compliance
Two properties facing LL97 penalties. Denair mapped the full compliance roadmap, sourced ConEd incentives, and installed automation controls. Both buildings now operate under the 2030 carbon benchmark.
Buildings brought to LL97 compliance
Under the 2030 carbon benchmark
Carbon output reduction
Via automation and controls retrofit
Queens & The Bronx · Multi-property service agreement
14 commercial properties across Queens and The Bronx — maintained under a single Denair service agreement. Consistent response times, unified reporting, and a single point of accountability across the portfolio.
Properties under Denair service
Across Queens and The Bronx
Emergency response, always
Avg. dispatch under 2 hours
19+ Years in Business. Our Promise Has Never Changed.
80% of our work is completed ahead of schedule — 20% on time. Never late.
One of the core principles of how we operate is complete transparency. From the very first conversation, we produce highly detailed estimates — every line item, explained. You know exactly what you're getting before a single bolt is turned.
You have our guarantee that the price will not change — not even a dollar — over the course of the project. No change orders. No surprises at close-out. The number we give you is the number you pay.
We want to become a reliable, long-term partner — not a vendor you call once and never hear from again. Send us your next opportunity. We'll prepare a detailed proposal and show you exactly where your budget can be improved.
Discuss Your Next ProjectCoverage That Protects You,
Not Just Us
General contractors and facility managers require coverage. We bring it to every bid — fully documented, ready to submit immediately.
Certified by the Brands
That Built the Industry
When Denair installs your system, the manufacturer's warranty is backed by Denair's factory certification — not voided by an unauthorized tech.
What GCs and
Facility Managers
Ask Us First
Can't find your answer? Call us directly at (212) 776-1333 — someone picks up.
Request a Scope ProposalWhat facility managers say
"Replaced our entire RTU over a single weekend — no tenant disruption, no cost surprises. DOB permits handled in-house, system commissioned within 5 days of contract signing. Best contractor experience I've had in 12 years managing buildings."
"Every other contractor I called had change orders. Denair's proposal was exactly what we paid — not a dollar over. For a building manager, price transparency is everything. I've referred them to three other buildings in the area."
"Our Bronx location had chronic HVAC failures every summer for three years straight. Denair redesigned the system from scratch. Two seasons later — not a single emergency call. Problem completely solved."
The Partner NYC Facilities
Teams Rely On
From Manhattan high-rises to Brooklyn industrial buildings — facility managers across all five boroughs trust Denair for installations that stay on schedule, on budget, and LL97-compliant.
Start Your ProjectGet Your Free Scope Proposal
Send us your drawings or describe your project. Our estimator will review and respond with a fully detailed, price-locked proposal — typically within 48 hours.