Expert Engineering & Design for Commercial HVAC
Alliance delivers HVAC planning built for Connecticut and New York—addressing coastal humidity, aging buildings, and the region’s demanding climate with systems that perform reliably and meet local codes.
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Other Commercial Services
New Construction HVAC
We have the experience, facilities and resources to fabricate and install ductwork, hydronic, chilled water and control systems for any new project.
Tenant Fit-Outs & Interior Alterations
Restaurants, Data Centers, retail spaces, etc. Alliance has the experience to manage timelines by working alongside contractors and other trades.
Building Automation & Control Systems
Today’s facilities require smart controls to balance comfort with efficiency. Alliance designs and installs building automation systems that integrate heating, cooling, ventilation, and lighting into a single, easy-to-manage platform. Our controls improve energy savings while giving property managers precise oversight.
Equipment Replacement & Upgrades
Let our retrofit experts help you select equipment and controls that will save energy and increase productivity by minimizing downtime.
Commercial HVAC Engineering & Design Services
Building Smarter Climate Solutions for Businesses
Every successful HVAC installation begins with expert planning. At Alliance, our engineering and design services provide the foundation for systems that perform reliably, operate efficiently, and meet the unique requirements of your business. We partner with building owners, developers, architects, and contractors across Connecticut and New York to design commercial climate control systems that keep people comfortable and protect your investment.
Call 203.335.9464 today to begin your commercial HVAC project with Alliance.
What Engineering & Design Includes
Our process goes beyond equipment selection. Alliance delivers end-to-end HVAC design services backed by decades of commercial experience, detailed engineering, and a commitment to quality. Each step ensures your system is built for long-term performance:
Load Calculations & System Sizing
A system that’s too small will underperform, and one that’s too large will waste energy. We use industry-standard load calculation methods (Manual J, N, and D) to evaluate building size, occupancy, insulation, orientation, and equipment heat loads. This ensures your system is sized precisely to handle demand while operating efficiently.
Ductwork & Airflow Design
Improper duct design is one of the biggest causes of uneven comfort and wasted energy. Alliance engineers map airflow pathways, duct sizing, and distribution layouts to maximize ventilation and efficiency across every floor. The result: consistent comfort in every space, fewer hotspots, and better energy use.
Zoning & Controls
No two areas of a commercial building use energy the same way. Offices, lobbies, retail spaces, and storage rooms all have different needs. We design zoned systems with advanced controls that allow you to set specific temperatures for each area, reduce wasted energy in unoccupied zones, and give building managers flexibility to adapt comfort settings in real time.
Ventilation Strategies
Indoor air quality is more important than ever in workplaces, schools, and healthcare environments. Alliance develops ventilation strategies that integrate outdoor air exchange, filtration, and energy recovery systems. This keeps your building compliant with ASHRAE and local codes while delivering healthier air for employees, tenants, and guests.
Sustainability Planning
Energy efficiency isn’t just about lower bills — it’s about building responsibly. We incorporate high-efficiency equipment, energy recovery ventilators, variable-speed systems, and smart automation controls to reduce operating costs and align with LEED or other green building goals. This creates long-term savings while helping businesses meet sustainability benchmarks.
Documentation & Specifications
Clear documentation is what sets a professional engineering firm apart. We provide detailed schematics, load reports, and system specifications that streamline installation, reduce errors in the field, and make inspections and approvals straightforward. This level of documentation protects your investment and ensures your project stays on schedule and within budget.
Our Standards
As a commercial mechanical contractor, Alliance’s engineering process is guided by ASHRAE standards, SMACNA guidelines, and the latest building codes in Connecticut and New York. We’ve also supported LEED-certified and sustainability-driven projects common across the region, giving clients confidence that every design is both compliant and forward-thinking.
When you choose Alliance for HVAC engineering and design, you’re not just getting a set of blueprints — you’re getting a system that has been carefully planned, thoroughly documented, and built to deliver performance for decades. From initial load calculations to final specifications, every detail is handled with precision so your project can move forward with confidence.
Need fast repairs or reliable maintenance for your facility? Alliance offers 24/7 service and customized maintenance programs to keep your systems running smoothly.
Call (203) 335-9464 now to get started.
Commercial Structures We Design For
Different facilities bring different challenges, and a good HVAC plan needs to reflect those realities. Over the years, we’ve developed designs for a wide range of properties, from dense office towers to adaptive reuse projects. Each type of building carries its own HVAC challenges, and our team’s experience allows us to anticipate and solve those problems before they disrupt your project.
Corporate Offices & High-Rise Buildings
The airflow demands of a corporate tower aren’t the same on every floor. A conference-heavy level with long hours of occupancy places very different stress on a system compared to private offices that empty at 5 p.m. Over the years we’ve designed solutions for open-plan offices, call centers, and multi-floor corporate tenants — each with zoning and control strategies that reduce complaints and keep energy use in check.
Retail & Shopping Centers
Retail spaces challenge HVAC design because demand can swing dramatically between low-traffic weekdays and packed weekends. In coastal Connecticut and New York, humidity, glass frontage, and frequent door traffic add even more complexity, which is why our designs emphasize zoning flexibility, dehumidification, and demand-controlled ventilation to keep spaces comfortable and costs under control.
Healthcare Facilities & Laboratories
Healthcare spaces come with the highest stakes. Infection control depends on proper air changes, pressure relationships between rooms, and filtration that meets code every single day. A lapse isn’t an inconvenience — it’s a risk to patients and staff. We’ve engineered designs for surgical suites, testing labs, and outpatient centers where the HVAC system becomes part of the life-safety strategy.
Educational Institutions
Schools rarely have the luxury of new construction; most projects involve additions or retrofits onto older facilities. That means tying new, efficient systems into aging infrastructure without disrupting classrooms. Gyms, cafeterias, and auditoriums add another challenge with huge, shifting occupancy loads. The designs have to be pragmatic — durable, serviceable, and efficient enough to satisfy boards and budgets while still giving students healthy, comfortable learning spaces.
Hospitality & Restaurants
Kitchens are brutal on HVAC systems: heat, grease, moisture, and constant activity. Dining rooms and guest areas need comfort without noise or drafts. Event spaces see occupancy swing from empty to packed in minutes. In hospitality projects we’ve been part of, the HVAC system is invisible to the guest — it works in the background, quietly protecting comfort and reputation.
Industrial & Warehousing
These are big, raw spaces that tax mechanical systems differently than offices or retail. High ceilings, large doors left open for loading, and equipment that generates its own heat mean the airflow strategy has to be industrial in scale. We’ve designed systems where the challenge wasn’t just temperature control but also air quality, keeping particulate matter down so employees could work safely.
Mixed-Use & Adaptive Reuse Properties
The region is full of older mills, factories, and commercial buildings now being reimagined as mixed-use spaces. No two are alike. One floor might house retail, another apartments, another offices. The HVAC has to support each without one use overwhelming the others. These projects test both creativity and technical precision, and it’s where our team’s depth of experience shows most — knowing how to respect the character of the building while introducing modern efficiency and control.
Government & Municipal Buildings
Town halls, courthouses, and other public facilities bring their own set of requirements. Many operate in older buildings that weren’t built for modern HVAC, while still needing to meet strict code, security, and public safety standards. We’ve been part of designs that balance preservation with performance, delivering reliable comfort for both staff and the public.
Across Connecticut and New York, commercial buildings span from historic factories to coastal retail spaces and modern office towers. Alliance’s designs account for those differences, ensuring each system is matched to both the building and the climate it operates in.
Comprehensive HVAC Planning
Commercial HVAC isn’t just about the technical drawings — it’s about the bigger picture. We provide full-scope planning that aligns HVAC systems with the goals of your building, your budget, and your long-term operations.
Develop Early-Stage Concepts
We get involved at the planning table, not just on the job site. By collaborating with owners, developers, and architects early, we help shape HVAC strategies that match the overall project vision and avoid costly redesigns later.
Collaboration Across Trades
Mechanical systems touch nearly every other discipline in construction. We coordinate directly with architects, structural engineers, and electrical contractors to make sure HVAC integrates seamlessly instead of becoming a conflict point during construction.
Flexible Project Scales
Our experience ranges from tenant fit-outs and office renovations to full-scale hospitals, schools, and multi-building campuses. Each project benefits from the same disciplined design process, tailored to the scope and complexity at hand.
Lifecycle Cost & Long-Term ROI
A smart HVAC plan isn’t just about day-one installation cost. We evaluate operating expenses, maintenance requirements, and system longevity to help clients make decisions that protect their budgets for decades.
With Alliance, HVAC engineering and design goes beyond mechanical drawings. Our planning gives you a framework you can trust — one that keeps construction on track, meets compliance standards, and ensures your system continues to perform long after the project is complete.
At Alliance, commercial HVAC engineering and design isn’t a side service — it’s the foundation of every successful project we take on. From concept to commissioning, our work anticipates problems before they surface and delivers systems proven to perform.
Call (203) 335-9464 now or schedule online to start your project today.
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