24/7 Emergency RTU Repair
Certified technicians on call around the clock to diagnose and restore failed rooftop units fast—usually within 4 hours. Fully equipped for all major RTU brands, ensuring Manhattan businesses stay operational in any season.
When your rooftop unit fails in Manhattan's brutal summer heat or a winter cold snap, every minute of downtime costs money and comfort. Denair HVAC's certified technicians are on call around the clock, arriving fully equipped to diagnose and restore your RTU—typically within 4 hours. Serving commercial properties, office buildings, and retailers across Manhattan with rapid, reliable emergency response.
Comprehensive RTU repair, maintenance, and upgrade solutions for Manhattan commercial properties—available 24/7, 365 days a year.
Certified technicians on call around the clock to diagnose and restore failed rooftop units fast—usually within 4 hours. Fully equipped for all major RTU brands, ensuring Manhattan businesses stay operational in any season.
Proactive maintenance plans designed to extend rooftop unit lifespan, reduce energy costs, and prevent surprise breakdowns. Customized contracts with free preventive maintenance up to 18 months on new installations.
Modernize aging rooftop units with targeted retrofits and performance tune-ups. Optimize energy efficiency, meet current NYC standards, and enhance comfort without the cost of a full system replacement.
Turnkey rooftop unit installation with end-to-end project management. Handles jobs from $10,000 to $5,000,000, with in-shop ductwork fabrication and on-site installation performed simultaneously to save weeks.
Guiding Manhattan building owners and property managers through NYC's Local Law 97 sustainability mandates—ensuring your rooftop HVAC systems meet emissions standards and avoid costly penalties.
Post-repair and post-installation air testing and balancing with certified reports. Ensures your rooftop unit is running at peak performance and meets NYC code requirements after every service.
Call us any time—day or night, weekday or weekend. Our Manhattan-area dispatch team routes the nearest certified RTU technician to your location immediately, with a target on-site arrival typically within 4 hours.
See how Denair HVAC has restored comfort and kept Manhattan businesses running with rapid emergency RTU repairs.
"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"
"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 am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"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!"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"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!"
"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"
"Denair is professional and courteous."
"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."
"excellent work and quality"
"Crew was respectful, fast, and left our place spotless. Five stars."
"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"
"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 am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"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!"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"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!"
"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"
"Denair is professional and courteous."
"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."
"excellent work and quality"
"Crew was respectful, fast, and left our place spotless. Five stars."
"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"
"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 am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"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!"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"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!"
"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"
"Denair is professional and courteous."
"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."
"excellent work and quality"
"Crew was respectful, fast, and left our place spotless. Five stars."
Manhattan's commercial properties demand a partner who responds fast, prices fairly, and delivers lasting repairs—every time.
Technicians arrive on Manhattan rooftops typically within 4 hours of your call, day or night.
OSHA-certified and trained by major RTU manufacturers—no waiting weeks for a factory rep across NYC.
Transparent, upfront repair proposals with no hidden costs—all unintended expenses covered at our own expense.
Locally based in NYC with deep knowledge of Manhattan building codes, rooftop access requirements, and LL97 compliance.
Experienced professionals dedicated to keeping Manhattan buildings comfortable around the clock.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with a single used truck and a determination to deliver honest, high-quality HVAC service across New York. With over 17 years of hands-on industry experience spanning every aspect of commercial and residential HVAC—including rooftop unit repair, installation, and project management—he has grown 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 vision with a focus on transparency, rapid emergency response, and delivering value-engineered solutions that protect the budgets of Manhattan property managers, building owners, and facility operators across all five boroughs.
Service Manager
Thomas leads Denair HVAC's service operations with a relentless focus on fast response times and consistent service quality—critical attributes for 24/7 emergency rooftop unit repair across Manhattan. He coordinates the full team of certified technicians, manages scheduling and dispatch, and ensures seamless communication with property managers and building operators from the moment a call comes in to the moment the system is back online. Thomas's operational expertise means Manhattan clients experience minimal downtime, organized rooftop access logistics, and a smooth service experience from emergency call to final system verification—regardless of the hour.
Application Engineer
Ramil brings deep technical expertise in HVAC system design and application engineering, with a specialization in matching rooftop unit solutions to each building's unique structural, performance, and energy requirements. He oversees equipment selection, technical planning, and post-repair application support to ensure that every RTU repair or upgrade delivers long-term reliability, measurable energy savings, and full compliance with NYC building codes including Local Law 97. For Manhattan commercial clients facing urgent RTU failures or planning system modernization, Ramil ensures the right technical solution is specified and executed with precision.
Lead Estimator
Farrukh has been a cornerstone of Denair HVAC since 2010, bringing over a decade of estimating expertise to every emergency RTU repair and commercial HVAC project across Manhattan and the broader NYC metro area. As Lead Estimator, he is responsible for preparing comprehensive bid proposals with speed and accuracy—ensuring Manhattan property managers receive detailed, transparent repair scopes and fixed pricing without delay. Farrukh's vendor relationships and knowledge of NYC's HVAC market allow Denair to consistently offer competitive pricing, often coming in lower than competitors while maintaining the highest standards of quality and code compliance.
A commercial rooftop unit (RTU) typically lasts 15 to 20 years when properly maintained. Factors like NYC's urban environment, rooftop exposure to weather extremes, and frequency of preventive maintenance all affect lifespan. Units that receive regular servicing—filter changes, coil cleaning, and seasonal tune-ups—consistently reach or exceed the upper end of that range.
Speak directly with a certified Manhattan HVAC specialist—free consultation, no obligation.
Denair HVAC provides 24/7 emergency rooftop unit repair across Manhattan and the greater New York metro area.
11 Regions
Service Area
24/7, 365 Days
Emergency Availability
Within 4 Hours
Response Time
Contact us to confirm coverage and dispatch an emergency RTU technician to your building today.
Named one of America's fastest-growing and most successful companies.
All technicians hold OSHA 40-hour safety certification for rooftop work.
Fully licensed and registered HVAC contractor in New York State.
Fill out the form below and a certified Denair HVAC technician will reach out immediately to confirm your dispatch. For the fastest response to an active emergency, call us directly at 212-776-1333.
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