HVAC System Upgrades
Modernize outdated equipment with targeted retrofits and expert tuning to optimize performance, enhance comfort, and meet current energy standards—without a full system replacement.
Manhattan's aging building stock and NYC's strict Local Law 97 mandates demand smarter HVAC solutions. Denair HVAC delivers expert retrofit upgrades and full-scale installations for commercial, residential, and mixed-use properties across the borough—saving clients up to 35% through value engineering, with fixed-price proposals, extended warranties, and a team of 28 certified technicians ready to perform.
Comprehensive retrofit, installation, and support services tailored for Manhattan's commercial and residential buildings.
Modernize outdated equipment with targeted retrofits and expert tuning to optimize performance, enhance comfort, and meet current energy standards—without a full system replacement.
Turnkey commercial HVAC installation with end-to-end project management. Covers equipment, ductwork, piping, controls, and commissioning for projects from $10,000 to $5,000,000.
Variable Refrigerant Flow and split systems ideal for Manhattan properties with rooftop or balcony access, delivering zoned comfort and efficient climate control.
Expert guidance through NYC's Local Law 97 sustainability mandates, helping Manhattan building owners avoid penalties and meet carbon emission targets.
Smart controls and automation systems that significantly reduce energy costs and environmental impact for commercial and multi-family buildings across Manhattan.
Proactive maintenance plans that extend system lifespan, reduce energy costs, and prevent surprise breakdowns. Free preventive maintenance included for up to 18 months on new installations.
Our application engineers conduct a thorough on-site evaluation of your Manhattan building's existing HVAC infrastructure, accounting for NYC building codes, Local Law 97 requirements, and the unique spatial constraints of high-rise and mixed-use properties.
See how Denair HVAC has delivered reliable retrofits and installations for properties across New York.
"Denair is the most dependable HVAC service company in New York!"
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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 am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"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"
"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!"
"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."
"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"
"Amazing HVAC vendor who is doing multiple accounts for my company."
"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!"
"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."
"excellent work and quality"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Denair is the most dependable HVAC service company in New York!"
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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 am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"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"
"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!"
"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."
"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"
"Amazing HVAC vendor who is doing multiple accounts for my company."
"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!"
"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."
"excellent work and quality"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Denair is the most dependable HVAC service company in New York!"
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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 am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"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"
"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!"
"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."
"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"
"Amazing HVAC vendor who is doing multiple accounts for my company."
"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!"
"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."
"excellent work and quality"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
Manhattan's buildings demand a contractor with proven expertise, pricing transparency, and the capacity to deliver on time. Here's what sets Denair apart.
Clients save up to 35% on Manhattan HVAC projects through our value-engineered proposals and alternative equipment sourcing.
All unintended costs are compensated at our own expense—no surprise invoices, ever.
28 OSHA-certified technicians, each with a minimum of 5 years' experience, trained and certified by major HVAC manufacturers.
Deep knowledge of NYC's Local Law 97 and Manhattan building codes ensures your retrofit meets every compliance requirement.
Experienced professionals dedicated to every phase of your HVAC project.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with a single used truck and a vision to bring honest, affordable HVAC service to New York. Over 17 years later, he has grown the company to over $2 million in annual revenue, earned Inc. 5000 recognition as one of America's fastest-growing companies, and built a team of 28 certified technicians serving Manhattan, Brooklyn, Queens, and beyond. Dennis leads Denair's strategic vision with a hands-on approach, ensuring every project—from a $10,000 retrofit in Midtown to a $5 million installation in a Hudson Yards high-rise—reflects the company's core values of honesty, commitment, and client satisfaction.
Lead Estimator
Farrukh has been with Denair HVAC since 2010, bringing over 14 years of estimating expertise to every bid. He is responsible for comprehensive and timely bid proposal preparation, tracking opportunities with vendors, subcontractors, and customers across Manhattan and the greater NYC metro area. Farrukh's meticulous scope breakdowns, alternates, and revisions are central to Denair's value engineering process—giving clients a clear, competitive picture of their HVAC retrofit or installation investment before a single tool is lifted. His work consistently helps clients save thousands on commercial HVAC projects throughout New York.
Application Engineer
Ramil designs and supports HVAC systems tailored to each Manhattan building's unique performance and efficiency requirements. He oversees equipment selection, technical planning, and application engineering support, ensuring every retrofit and new installation delivers long-lasting reliability, measurable energy savings, and full compliance with NYC building codes and Local Law 97. Ramil's engineering expertise is especially valuable for complex high-rise, mixed-use, and mission-critical facilities across the borough, where precise system design can mean the difference between a costly overrun and a project delivered on time and on budget.
Service Manager
Thomas leads Denair HVAC's service operations across Manhattan and the NYC metro area, ensuring fast response times, efficient technician scheduling, and consistent service quality on every job. He coordinates field crews and client communication to minimize downtime and deliver a seamless service experience from first call to final sign-off. Thomas's operational oversight is the reason Denair achieves same-day service in most cases—usually within 4 hours—and why 80% of all projects are completed ahead of schedule, keeping Manhattan tenants, staff, and building operations fully protected in every season.
Variable Frequency Drives (VFDs) are used in HVAC systems to control the speed of motors driving fans, pumps, and compressors. By adjusting motor speed to match real-time demand rather than running at full capacity constantly, VFDs can reduce energy consumption by up to 50%, extend equipment lifespan, and improve overall system comfort and control—a key component in modern HVAC retrofits.
Talk to a Denair HVAC expert for a free consultation and fixed-price estimate.
Denair HVAC serves Manhattan and the entire NYC metro area with certified HVAC retrofit and installation services.
11 Regions
Service Area
24/7 Service
Emergency Availability
400+ Projects
Projects Completed
Contact us to confirm coverage and schedule a free on-site assessment today.
Recognized as one of America's fastest-growing companies.
Full team compliance with federal workplace safety standards.
Fully licensed HVAC contractor operating across New York.
Fill out the form below and a Denair HVAC project specialist will reach out within one business day to discuss your building's needs, provide a fixed-price proposal, and answer any questions about your retrofit or installation project.
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