Commercial HVAC System Design Built for New York.
Commercial HVAC design for buildings across Brooklyn, Manhattan, Queens, the Bronx, and Staten Island. Designed around your building, your operating priorities, and Local Law 97 planning from day one.
Recognized
A system designed for your building. Not the one next door.
At Denair HVAC, we understand that commercial HVAC design directly affects occupant comfort, energy use, equipment reliability, and compliance planning. Our team works closely with you from day one: assessing your building, understanding your occupancy requirements, and designing a system that fits how your facility operates.
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 commercial design software and load-calculation tools, we create a coordinated plan for equipment selection, ductwork, piping, ventilation, controls, and the transition from design into HVAC system installation.
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, clarity, and a solid footing for compliance planning.
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-sizing to documented loads helps avoid both oversizing and under-delivery.
Ductwork Layout & Sizing
Detailed ductwork 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 Electric, and more, specifying the right unit, efficiency rating, and footprint for your building.
Energy Performance Modeling
Projected energy-use and emissions modeling against applicable benchmarks, identifying potential gaps before construction begins. The design supports an informed Local Law 97 compliance strategy.
BAS / BMS Controls Design
Integrated BAS/BMS controls design using supported commercial platforms, giving facility managers clearer scheduling, alarms, trending, and energy visibility.
Construction-Ready Drawings
Complete mechanical drawings and specifications formatted for NYC DOB submission, coordinated with your architect and structural engineer to help catch field conflicts before construction.
Key Stages.
From first conversation to final drawings, a structured process that reduces 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 commercial load-calculation software and applicable ASHRAE methods, we calculate heating and cooling loads by zone so equipment is selected from documented building conditions rather than rule-of-thumb estimates.
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 value engineering considerations.
LL97 Planning Review
Where Local Law 97 applies, the design is reviewed against current and upcoming emissions limits. We identify HVAC-related reduction opportunities and develop an informed pathway that supports the building's broader compliance plan.
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 support pre-construction approvals.
Design with LL97 in mind, not as an afterthought.
Local Law 97 sets greenhouse gas emissions limits for most NYC buildings over 25,000 gross square feet, in effect since 2024, with stricter limits beginning in 2030. Addressing emissions and energy performance during design can reduce the need for disruptive corrective work later.
Denair HVAC designs commercial systems with LL97 limits as a baseline, not an afterthought. We model projected emissions against current and 2030 limits, select equipment that supports the project's efficiency and emissions objectives, and integrate automation controls that give you ongoing visibility into emissions performance. Compliance depends on your building, its emissions profile, and the measures you choose.
Limits and thresholds per the NYC Department of Buildings, reviewed October 2026. Confirm current rules and deadlines with the Department of Buildings.
Request an LL97 AssessmentBrands We Design & Specify.
Denair works with leading commercial equipment and controls platforms. Factory-trained capabilities are applied where supported, with each system selected around building requirements, serviceability, and lifecycle performance.
The partner that stays in it with you.
Denair stays engaged through construction, commissioning, and beyond, because a design is only as good as its execution. Our team provides design support throughout the project lifecycle, from permit questions to system startup.
Talk to Our Design TeamWe know the buildings, the codes, and the mechanical rooms. That institutional knowledge is built into every design we produce.
Not a checkbox, a design input. We model emissions performance before equipment is selected, so LL97 is part of the design from the start, not added afterward.
Our team applies manufacturer-specific knowledge across AAON, Trane, LG, Mitsubishi Electric, 75F, and other commercial platforms. That experience informs equipment selection, coordination, commissioning, and serviceability.
Denair supports installation, commissioning, preventive maintenance, and 24/7 emergency service after design. One accountable partner supports the full system lifecycle.
Commercial HVAC Design FAQs.
Clear answers for NYC facility teams planning a new system, renovation, or capital improvement project.
What does HVAC system design for a commercial building include?
Commercial HVAC system design can include building and zone load calculations, equipment selection and sizing, ductwork and piping layouts, ventilation requirements, control sequences, energy modeling, and construction-ready documents. Denair tailors the design scope to the building, occupancy, operations, and project requirements.
How does HVAC system design support NYC Local Law 97 planning?
HVAC design can reduce operational emissions by right-sizing equipment, improving system efficiency, evaluating electrification options, and integrating controls that limit wasted energy. Denair reviews applicable Local Law 97 benchmarks during design, while final compliance depends on the building's complete emissions profile and verified annual performance.
How long does the commercial HVAC system design process take?
A typical design engagement may take approximately two to six weeks, but the schedule depends on building complexity, field access, available documentation, engineering coordination, review cycles, and filing requirements. Denair establishes the project schedule after the initial assessment.
Can Denair design HVAC systems for buildings undergoing renovation or retrofit?
Yes. Denair designs retrofit and renovation solutions that coordinate new equipment with existing ductwork, piping, electrical capacity, controls, and occupied-building schedules. The goal is to improve reliability and efficiency while limiting unnecessary disruption.
Does Denair design HVAC systems for different commercial building types in NYC?
Yes. Denair works with offices, retail properties, healthcare facilities, data and technology spaces, restaurants, hotels, mixed-use buildings, and other commercial facilities across Brooklyn, Manhattan, Queens, The Bronx, and Staten Island.
Can the HVAC design include BAS or BMS controls?
Yes. The design can include control sequences, scheduling, alarms, sensor requirements, trending, and integration with a building automation system. Denair coordinates the mechanical equipment and controls strategy so facility teams have clearer operational visibility.
Does Denair coordinate NYC DOB documents for HVAC projects?
Denair can coordinate applicable mechanical drawings, specifications, equipment schedules, engineering documents, and project-team requirements for NYC Department of Buildings submissions. The exact filing, inspection, and closeout scope is confirmed for each project.
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 service line across all five NYC boroughs
- LL97 planning built into every engagement
- 19+ years partnering with NYC facility managers
- Design, installation, controls, and maintenance under one partner