RTU Installation
Full turnkey rooftop unit installation including equipment selection, crane coordination, ductwork connections, and commissioning—completed on schedule with fixed proposal pricing and minimal operational downtime.
Brooklyn's flat rooftops and dense commercial corridors demand HVAC systems built to perform year-round. Denair HVAC delivers expert rooftop unit replacement and installation across Brooklyn—offering value-engineered solutions, fixed pricing, and up to 10-year warranties. Whether you're upgrading an aging RTU or installing a new system, our certified team handles it all with minimal disruption to your operations.
Comprehensive RTU solutions for commercial and residential properties across Brooklyn and the greater NYC metro area.
Full turnkey rooftop unit installation including equipment selection, crane coordination, ductwork connections, and commissioning—completed on schedule with fixed proposal pricing and minimal operational downtime.
Seamless replacement of outdated or failed rooftop units with modern, energy-efficient equipment. We handle disconnection, removal, and new unit startup—saving clients up to 35% through value engineering.
Targeted retrofits and expert system tuning to modernize aging RTU equipment, optimize performance, reduce energy costs, and ensure compliance with NYC's current energy and sustainability standards.
Proactive RTU maintenance plans that extend system lifespan, reduce energy costs, and prevent unexpected breakdowns. Free preventive maintenance included for up to 18 months on all new installations.
Certified technicians on call around the clock to diagnose and restore failed rooftop units—usually within 4 hours. Trained on all major RTU brands from 1/2 to 100 tons of cooling capacity.
Post-installation air testing and balancing with certified reports to verify your new or replaced rooftop unit is operating at peak performance and meeting code-compliant airflow requirements.
Our application engineer evaluates your Brooklyn property's rooftop dimensions, structural load capacity, and building cooling/heating demands to precisely size the right RTU—accounting for NYC building codes and local climate requirements.
See how Brooklyn and NYC property owners have saved thousands with Denair HVAC's RTU solutions.
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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"
"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"
"Impeccable install. You can tell they're pros the moment they walk in."
"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."
"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..."
"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!"
"Denair is the most dependable HVAC service company in New York!"
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"excellent work and quality"
"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!"
"Crew was respectful, fast, and left our place spotless. Five stars."
"Denair is professional and courteous."
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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"
"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"
"Impeccable install. You can tell they're pros the moment they walk in."
"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."
"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..."
"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!"
"Denair is the most dependable HVAC service company in New York!"
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"excellent work and quality"
"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!"
"Crew was respectful, fast, and left our place spotless. Five stars."
"Denair is professional and courteous."
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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"
"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"
"Impeccable install. You can tell they're pros the moment they walk in."
"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."
"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..."
"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!"
"Denair is the most dependable HVAC service company in New York!"
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"excellent work and quality"
"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!"
"Crew was respectful, fast, and left our place spotless. Five stars."
"Denair is professional and courteous."
Brooklyn property owners and managers trust Denair HVAC for rooftop unit projects because we deliver proven results, transparent pricing, and industry-leading guarantees.
We optimize every RTU proposal by up to 35%, identifying equal-performance equipment at lower cost—clients saved over $186,000 on NYC HVAC projects in the last 6 months alone.
All unintended costs are covered at our own expense. Brooklyn project owners get fixed proposal pricing with no surprise invoices—ever.
Up to a 10-year extended manufacturer's warranty on every piece of RTU equipment we install, plus 18 months of complimentary preventive maintenance on all new installations.
Recognized as one of America's fastest-growing companies, Denair HVAC has served Brooklyn and the NYC metro area with 400+ completed HVAC projects since 2007.
Experienced specialists dedicated to delivering outstanding RTU results across Brooklyn.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with one man and a beat-up used truck right after being laid off from a 7-year career in the HVAC industry. Armed with over 17 years of hands-on HVAC expertise and deep knowledge of Brooklyn and NYC's commercial building landscape, he grew the company to $2 million in revenue within just five years. Under his strategic leadership, Denair earned recognition by Inc. 5000 as one of America's fastest-growing companies. Dennis oversees all aspects of the business—from rooftop unit replacement projects across Brooklyn's flat-roof commercial buildings to large-scale capital improvement contracts throughout the NYC metro area—ensuring every client receives honest, high-quality service.
Financial Manager
Tanya brings over 15 years of experience in finance, budgeting, and forecasting to the Denair HVAC team. She manages all aspects of accounting, financial planning, and insurance for the company—ensuring every rooftop unit replacement and installation project is backed by financial integrity and transparent cost management. Her meticulous approach to budgeting directly supports Denair's ability to offer fixed proposal pricing and value-engineered solutions that consistently save Brooklyn and NYC clients thousands of dollars. Tanya's financial stewardship has been a cornerstone of Denair's steady growth from a one-man operation to a recognized industry leader.
Lead Estimator
Farrukh has been with Denair HVAC since 2010, making him one of the company's longest-serving and most trusted team members. As Lead Estimator, he is responsible for preparing comprehensive and timely bid proposals for rooftop unit replacement and installation projects across Brooklyn and the wider NYC metro area. His expertise in tracking opportunities with vendors, subcontractors, and customers ensures every scope is accurately priced—with alternates and revisions provided for each bid. Farrukh's value engineering approach has helped Brooklyn property managers and business owners save significantly on their HVAC capital improvement budgets.
Service Manager
Thomas leads Denair HVAC's service operations, overseeing fast response times, efficient technician scheduling, and consistent service quality for rooftop unit projects throughout Brooklyn. He coordinates field technicians and customer communications to keep RTU systems running reliably—minimizing downtime for commercial tenants, property managers, and building operators. Thomas ensures that Denair's commitment to same-day service (usually within 4 hours for emergencies) is consistently met, and that every rooftop unit installation or repair is delivered with the smooth, professional experience Brooklyn clients expect from an Inc. 5000-recognized contractor.
Application Engineer
Ramil designs and supports HVAC systems tailored to the specific performance and efficiency needs of each Brooklyn building. Specializing in rooftop unit applications, he oversees equipment selection, technical planning, and engineering support to ensure every RTU installation delivers long-lasting reliability, meaningful energy savings, and full compliance with NYC building codes and LL97 sustainability mandates. Ramil's engineering expertise is particularly valuable for Brooklyn's dense stock of flat-roof commercial and mixed-use buildings, where precise load calculations and rooftop structural considerations are critical to a successful RTU replacement or new installation.
Denair HVAC serves commercial and residential properties across Brooklyn, all NYC boroughs, and the wider metro area.
11+ Regions
Service Area
400+
Projects Completed
Within 4 Hours
Emergency Response
Contact us to confirm coverage and schedule your free rooftop unit assessment today.
Recognized as one of America's fastest-growing companies.
All technicians hold OSHA 40-hour safety certification.
Licensed and registered HVAC/mechanical contractor in New York.
Fill out the form below and a Denair HVAC specialist will contact you promptly to discuss your RTU project, provide a detailed scope breakdown, and arrange a free on-site assessment.
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