Full System Replacement
Complete end-to-end commercial AC system replacement with turnkey project management, covering equipment removal, new installation, ductwork, piping, and commissioning for buildings of any size.
Brooklyn's commercial buildings face intense summer humidity and year-round operational demands that aging AC systems simply can't keep up with. Denair HVAC delivers expert commercial AC replacement services—engineered to maximize uptime, slash energy costs by up to 58%, and keep your tenants, staff, and operations comfortable. Backed by 19+ years of NYC experience and a 10-year warranty option.
Comprehensive commercial AC replacement solutions tailored for Brooklyn businesses, from full system upgrades to energy-efficient modern installs.
Complete end-to-end commercial AC system replacement with turnkey project management, covering equipment removal, new installation, ductwork, piping, and commissioning for buildings of any size.
Specialized replacement of rooftop HVAC units for commercial properties. We handle the full scope—from site assessment and equipment selection to installation and system balancing—minimizing operational disruption.
Replace outdated systems with high-efficiency VRF or split systems, ideal for Brooklyn commercial properties with rooftop or balcony access, delivering precise zone control and significant energy savings.
Modernize aging commercial AC equipment with targeted retrofits and system upgrades. Optimize performance, improve energy efficiency, and meet current NYC energy standards without a full tear-out.
Integrate smart building controls and automation into your new AC system to dramatically reduce energy costs and meet NYC's Local Law 97 sustainability compliance requirements.
Protect your new AC investment with customized preventive maintenance plans. All new installations include up to 18 months of free preventive maintenance to maximize system lifespan and efficiency.
Our certified engineers conduct a thorough on-site evaluation of your Brooklyn commercial property, assessing your existing AC system's condition, building load requirements, and any NYC code compliance considerations before recommending a replacement strategy.
See how Denair HVAC has delivered cost-saving, code-compliant AC replacements for commercial clients across NYC.
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"Denair is the most dependable HVAC service company in New York!"
"I recently used Denair for some repairs to my small two-story office building, and I have to say they are the most honest, hard-working and value focused HVAC provider I have ever experienced! Not only was the price competitive, but more importantly they helped reduce my energy costs from an..."
"I didn't even know about their referral program sending DENAIR to one of my commercial tenants. It was a nice surprise to get paid for referral. Based on the tenant's feedback, the job was well-done. Now it's no brainer to recommend DENAIR to all my tenants"
"Great company, our office was getting hotter by the minute. Denair had a tech on site with in the hour and the ac working perfect in two hours"
"I am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"They have the best Engineering Service I have ever seen; they are always available on request and perform the maintenance in the most efficient way. Great Service."
"Impeccable install. You can tell they're pros the moment they walk in."
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"Great reliable HVAC company, a very rare thing to say these days — the pricing is very competitive and the work is reliable. The staff is professional and courteous, they clean up after themselves and always answer. I would recommend them!"
"What a great service. I randomly called to get multiple system inspected in my building. They came on time, done a great job and provided a detailed report. I love their transparency."
"Dennis was always available when I called on him. Never was any additional work generated on any quote/contract awarded. Reliable, expert and a pleasure to work with. A real value!"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Amazing HVAC vendor who is doing multiple accounts for my company."
"Crew was respectful, fast, and left our place spotless. Five stars."
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"Denair is the most dependable HVAC service company in New York!"
"I recently used Denair for some repairs to my small two-story office building, and I have to say they are the most honest, hard-working and value focused HVAC provider I have ever experienced! Not only was the price competitive, but more importantly they helped reduce my energy costs from an..."
"I didn't even know about their referral program sending DENAIR to one of my commercial tenants. It was a nice surprise to get paid for referral. Based on the tenant's feedback, the job was well-done. Now it's no brainer to recommend DENAIR to all my tenants"
"Great company, our office was getting hotter by the minute. Denair had a tech on site with in the hour and the ac working perfect in two hours"
"I am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"They have the best Engineering Service I have ever seen; they are always available on request and perform the maintenance in the most efficient way. Great Service."
"Impeccable install. You can tell they're pros the moment they walk in."
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"Great reliable HVAC company, a very rare thing to say these days — the pricing is very competitive and the work is reliable. The staff is professional and courteous, they clean up after themselves and always answer. I would recommend them!"
"What a great service. I randomly called to get multiple system inspected in my building. They came on time, done a great job and provided a detailed report. I love their transparency."
"Dennis was always available when I called on him. Never was any additional work generated on any quote/contract awarded. Reliable, expert and a pleasure to work with. A real value!"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Amazing HVAC vendor who is doing multiple accounts for my company."
"Crew was respectful, fast, and left our place spotless. Five stars."
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"Denair is the most dependable HVAC service company in New York!"
"I recently used Denair for some repairs to my small two-story office building, and I have to say they are the most honest, hard-working and value focused HVAC provider I have ever experienced! Not only was the price competitive, but more importantly they helped reduce my energy costs from an..."
"I didn't even know about their referral program sending DENAIR to one of my commercial tenants. It was a nice surprise to get paid for referral. Based on the tenant's feedback, the job was well-done. Now it's no brainer to recommend DENAIR to all my tenants"
"Great company, our office was getting hotter by the minute. Denair had a tech on site with in the hour and the ac working perfect in two hours"
"I am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"They have the best Engineering Service I have ever seen; they are always available on request and perform the maintenance in the most efficient way. Great Service."
"Impeccable install. You can tell they're pros the moment they walk in."
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"Great reliable HVAC company, a very rare thing to say these days — the pricing is very competitive and the work is reliable. The staff is professional and courteous, they clean up after themselves and always answer. I would recommend them!"
"What a great service. I randomly called to get multiple system inspected in my building. They came on time, done a great job and provided a detailed report. I love their transparency."
"Dennis was always available when I called on him. Never was any additional work generated on any quote/contract awarded. Reliable, expert and a pleasure to work with. A real value!"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Amazing HVAC vendor who is doing multiple accounts for my company."
"Crew was respectful, fast, and left our place spotless. Five stars."
Brooklyn businesses trust Denair HVAC because we combine deep local expertise with proven commercial HVAC capabilities that larger firms can't match on value.
We save Brooklyn clients an average of 24%—and up to 35%—on commercial AC replacement budgets through expert value engineering and alternative equipment sourcing.
Founded in Brooklyn in 2007, Denair HVAC has deep roots in NYC's commercial real estate landscape, from Bay Ridge to Downtown Brooklyn and beyond.
Every commercial AC replacement comes with up to a 10-year extended equipment warranty and up to 18 months of free preventive maintenance included.
All unintended project costs are absorbed by us—never passed to you. If project delays occur, we compensate 0.1% of the contract amount per day, ensuring accountability.
The experienced professionals behind Brooklyn's most reliable commercial AC replacements.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with a single used truck and a vision to build New York's most affordable and reliable commercial HVAC company. With over 17 years of hands-on HVAC industry experience spanning every aspect of the business—from field operations to strategic leadership—he grew Denair from a one-man operation to a $2M+ revenue company recognized by Inc. 5000 as one of America's fastest-growing businesses. Dennis leads the company's strategic direction, championing value engineering and transparent pricing that consistently saves Brooklyn and NYC commercial clients tens of thousands on AC replacement and installation projects.
Service Manager
Thomas leads Denair HVAC's service operations across Brooklyn and the greater NYC metro area, ensuring fast response times, efficient scheduling, and consistent service quality on every commercial AC replacement project. He coordinates the company's team of 28 certified technicians and manages all customer communication, keeping commercial systems running reliably with minimal downtime. Thomas's operational discipline is a key reason Denair completes 80% of projects ahead of schedule—a critical advantage for Brooklyn businesses that can't afford extended HVAC downtime during New York's demanding summer cooling season.
Application Engineer
Ramil is Denair HVAC's Application Engineer, responsible for designing and specifying commercial AC replacement systems tailored to each Brooklyn building's unique performance, efficiency, and structural requirements. He oversees equipment selection, technical planning, load calculations, and application support to ensure every replacement delivers long-lasting reliability, measurable energy savings, and full compliance with NYC mechanical codes and Local Law 97 sustainability mandates. Ramil's engineering expertise ensures clients receive the right system—correctly sized and specified—the first time.
Lead Estimator
Farrukh has been a cornerstone of Denair HVAC since 2010, serving as Lead Estimator and playing a central role in the company's growth to over $76M in project bids. He is responsible for preparing comprehensive and timely bid proposals for commercial AC replacement projects across Brooklyn and NYC, tracking opportunities with vendors, subcontractors, and customers. His meticulous approach to scope breakdowns, alternates, and revisions—combined with Denair's value engineering methodology—consistently delivers proposals that come in 24–35% below competing bids without sacrificing system quality or performance.
Project timelines vary by building size and system complexity, but Denair HVAC completes 80% of commercial AC replacement projects ahead of schedule. Our team performs on-site installation and in-shop ductwork fabrication simultaneously to save weeks. A typical commercial replacement for a mid-size Brooklyn office or retail space takes 3–10 business days depending on scope.
Talk to a Denair HVAC expert for a free consultation and detailed project estimate.
Denair HVAC serves commercial clients across all five NYC boroughs and the surrounding metro area.
11 Regions
Service Area
24/7 Service
Emergency Availability
4.7★ Rated
Google Rating
Contact us to confirm coverage and schedule a free on-site assessment for your commercial property.
Recognized as one of America's fastest-growing companies
Full team compliance with federal occupational safety standards
Licensed Mechanical/HVAC Contractor for commercial work in New York
Fill out the form below and a Denair HVAC specialist will contact you to discuss your commercial property's needs, provide a detailed scope breakdown, and deliver a value-engineered proposal—at no cost and with no obligation.
For immediate assistance, feel free to give us a direct call at 718-791-5074 You can also send us a quick email at
For immediate assistance, feel free to give us a direct call at 718-791-5074 You can also send us a quick email at