HVAC System Design Built for New York.
Engineering-grade HVAC design for commercial buildings across Brooklyn, Manhattan, Queens, the Bronx, and Staten Island. Custom-engineered to your building — and built for LL97 compliance from day one.
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A system designed for your building. Not the one next door.
At Denair HVAC, we understand that the design of your HVAC system plays a crucial role in the overall comfort, efficiency, and compliance of your commercial space. Our experienced engineering team works closely with you from day one — assessing your building, understanding your occupancy requirements, and building a system that performs exactly as your facility demands.
Our design process begins with a thorough assessment of your commercial space. We analyze building size, occupancy patterns, equipment loads, and energy efficiency goals. Using the latest design software and load-calculation tools, we create a detailed plan that covers equipment selection, ductwork sizing, and vent placement — every element engineered to your unique requirements.
Throughout the process, communication is a constant. We value your input and incorporate your feedback into the final design. Our goal isn't just to meet your expectations — it's to deliver an HVAC system that gives you control, confidence, and compliance.
Request a Design Consultation →Our HVAC System Design Services Include.
Every design engagement covers the full scope — from initial assessment to final construction-ready documents.
Building Load Calculations
Precise heat gain and heat loss calculations based on your building's envelope, occupancy density, lighting loads, and equipment. Right-sized systems — no oversizing, no under-delivery.
Ductwork Layout & Sizing
Detailed duct design with friction loss analysis, velocity checks, and coordination with architectural and structural drawings — optimized for airflow and acoustic performance.
Equipment Selection & Specifications
Factory-informed equipment selection across AAON, Trane, Carrier, Daikin, LG, Mitsubishi, and more — specifying the right unit, the right efficiency rating, and the right footprint for your building.
Energy Performance Modeling
Projected energy use intensity (EUI) modeling against LL97 benchmarks — identifying compliance gaps before construction begins, not after. We build the path to 2030 into the design itself.
BAS / BMS Controls Design
Integrated building automation design using 75F and Honeywell platforms — giving facility managers real-time visibility, scheduling control, and energy dashboards from day one.
Construction-Ready Drawings
Complete mechanical drawings and specifications formatted for NYC DOB submission — coordinated with your architect and structural engineer to eliminate field conflicts before they happen.
Key Stages.
From first conversation to final drawings — a structured process that eliminates surprises.
Site Assessment & Discovery
We conduct a thorough walkthrough of your commercial space — documenting building envelope conditions, existing mechanical infrastructure, occupancy loads, and operational requirements.
Load Calculation & System Sizing
Using industry-standard software (ASHRAE Manual J/N methodology), we calculate heating and cooling loads for every zone — ensuring the system is sized precisely, not estimated.
Conceptual Design & Equipment Selection
We develop system concepts — RTUs, VRF/VRV, DOAS, chilled water, or hybrid configurations — and present equipment options with performance data, efficiency ratings, and cost comparisons.
LL97 Compliance Review
Every design is benchmarked against Local Law 97 emissions limits — both current (2024) and upcoming (2030) caps. We identify where your building stands and design a compliant path forward.
Design Development & Client Review
We present detailed design documents for your review — duct layouts, equipment schedules, and control sequences. Your feedback is incorporated before we advance to final drawings.
Construction Documents & DOB Coordination
Final mechanical drawings, specifications, and equipment submittals — formatted for NYC DOB permitting and coordinated with your project team to clear all pre-construction hurdles.
Design for compliance. Not retrofits later.
Local Law 97 establishes strict carbon emissions caps for NYC buildings over 25,000 square feet — with penalty exposure starting in 2024 and tightening through 2030. The most cost-effective path to compliance is engineering it into your HVAC system design from the start.
Denair HVAC designs every commercial system with LL97 benchmarks as a baseline — not an afterthought. We model your projected EUI against current and 2030 limits, select equipment with the efficiency ratings that keep you on the right side of the law, and integrate automation controls that give you ongoing visibility into your emissions performance.
Request a Free LL97 AssessmentBrands We Design & Specify.
Denair is factory-trained across the equipment we design for — not just familiar with the specs, but certified to specify, install, and service each platform.
The partner that stays in it with you.
Most contractors hand off drawings and move on. Denair stays engaged through construction, commissioning, and beyond — because a design is only as good as its execution. Our team provides engineering support throughout the project lifecycle, from permit questions to system startup.
Talk to Our Engineering TeamWe know the buildings, the codes, the inspectors, and the mechanical rooms. That institutional knowledge is built into every design we produce.
Not a checkbox — a design constraint. We model emissions performance before equipment is selected, so compliance is engineered in, not bolted on.
Our engineers are factory-trained on the equipment we specify — AAON, Trane, LG, Mitsubishi, 75F, and more. That expertise shows up in the details of every design document.
Denair handles design, construction, commissioning, preventative maintenance, and 24/7 emergency response. One partner, full lifecycle — no handoffs, no gaps.
Frequently Asked Questions.
Commercial HVAC system design includes load calculations based on building size and occupancy, equipment selection and sizing, ductwork layout and specifications, vent and register placement, and energy performance modeling. Denair HVAC delivers a complete design package tailored to your building's specific needs across all five NYC boroughs.
A properly engineered HVAC system is one of the most effective tools for reducing your building's carbon emissions and meeting LL97 benchmarks. Denair's design process incorporates energy efficiency targets from the start — selecting right-sized equipment, specifying high-efficiency systems, and integrating automation controls that keep your building compliant through 2030 and beyond.
Design timelines depend on building complexity, but most commercial HVAC design projects run 2–6 weeks from initial assessment to final deliverables. Denair works closely with your team throughout — we keep you informed at every milestone so there are no surprises.
Yes. Denair specializes in retrofit and renovation HVAC design — integrating new system components into existing infrastructure without unnecessary disruption to your building operations. We work with legacy systems and existing ductwork layouts to design upgrades that improve performance and compliance.
Denair designs HVAC systems for a full range of NYC commercial properties — office buildings, retail spaces, healthcare facilities, data centers, mixed-use developments, and more. Our team is experienced across all five boroughs and understands the specific mechanical and regulatory requirements of New York City buildings.
Let's Talk About
Your Building.
Whether you're navigating LL97 compliance, planning a capital improvement project, or dealing with a system that can't wait — our team is ready to respond.
- 24/7 emergency response across all five NYC boroughs
- LL97 compliance expertise built into every engagement
- 10+ years partnering with NYC facility managers
- Proven 30% average reduction in energy costs