Rheem RTU Repair
Fast, expert diagnosis and repair of Rheem rooftop units across NYC. Certified technicians arrive fully equipped to restore your system—usually within 4 hours—minimizing downtime and disruption to your operations.
New York's buildings face demanding year-round climate swings—from humid Brooklyn summers to bitter winter cold snaps. Denair HVAC's certified technicians deliver expert Rheem rooftop unit service, repair, and maintenance across all five boroughs and NYC Metro, keeping your systems running at peak efficiency with same-day response and up to 10-year warranty coverage.
Comprehensive Rheem rooftop unit solutions for commercial and residential buildings across Brooklyn and NYC.
Fast, expert diagnosis and repair of Rheem rooftop units across NYC. Certified technicians arrive fully equipped to restore your system—usually within 4 hours—minimizing downtime and disruption to your operations.
Proactive Rheem RTU maintenance plans designed to extend system lifespan, improve energy efficiency, and prevent costly breakdowns. Free preventive maintenance included for up to 18 months on all new installations.
Around-the-clock emergency Rheem RTU service across Brooklyn and NYC. Manufacturer-trained technicians respond to urgent failures day or night, restoring comfort and critical operations with minimal disruption.
End-to-end Rheem rooftop unit installation with full project management, value engineering, and commissioning. Save up to 35% on your HVAC budget through our optimized turnkey approach.
Modernize aging Rheem RTU equipment with targeted retrofits and expert tuning. Optimize performance, enhance comfort, and meet current NYC energy standards without the cost of a full system replacement.
Smart controls and automation solutions integrated with your Rheem RTU to significantly reduce energy costs and support LL97 compliance—critical for NYC commercial property owners managing carbon emissions mandates.
Brooklyn rooftops and NYC commercial buildings place extraordinary demands on HVAC equipment. Denair HVAC's factory-trained technicians are certified on Rheem equipment and bring 19+ years of hands-on NYC experience to every job. From routine tune-ups to complex rooftop unit overhauls, we deliver same-day response, fixed-price proposals, and up to a 10-year extended warranty—so your Rheem RTU performs reliably through every New York season.
See how Denair HVAC has kept Rheem RTU systems running reliably for businesses across Brooklyn and New York City.
"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."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"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 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"
"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!"
"Crew was respectful, fast, and left our place spotless. Five stars."
"Impeccable install. You can tell they're pros the moment they walk in."
"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!"
"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."
"excellent work and quality"
"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"
"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."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"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 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"
"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!"
"Crew was respectful, fast, and left our place spotless. Five stars."
"Impeccable install. You can tell they're pros the moment they walk in."
"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!"
"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."
"excellent work and quality"
"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"
"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."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"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 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"
"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!"
"Crew was respectful, fast, and left our place spotless. Five stars."
"Impeccable install. You can tell they're pros the moment they walk in."
"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!"
"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."
"excellent work and quality"
"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"
"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..."
Denair HVAC combines manufacturer-level Rheem expertise with 19+ years of NYC field experience to deliver results no generalist contractor can match.
Trained and certified directly by Rheem—no generic repair, just manufacturer-level expertise on every NYC job.
Technicians dispatched across Brooklyn and all five boroughs, typically on-site within 4 hours of your call.
Fixed-price proposals with no surprise costs—unintended overruns are covered at our expense, guaranteed.
Up to 10-year extended warranty on Rheem equipment and parts, protecting your NYC building investment long-term.
Experienced professionals dedicated to Rheem RTU excellence across Brooklyn and NYC.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with a single used truck and a determination to deliver honest, high-quality HVAC service to New York. With over 17 years of hands-on HVAC industry experience, he has built the company from the ground up to a $2 million+ revenue enterprise recognized by Inc. 5000 as one of America's fastest-growing companies. Dennis leads Denair's strategic vision and has established deep manufacturer relationships—including Rheem—ensuring the team stays ahead of the latest RTU technology and service standards across Brooklyn, Manhattan, and the wider NYC Metro.
Service Manager
Thomas leads Denair HVAC's service operations, overseeing every Rheem RTU repair and maintenance job across Brooklyn and NYC from dispatch to completion. His focus on fast response times, efficient technician scheduling, and rigorous quality control ensures clients experience minimal system downtime and a smooth service process every time. Thomas coordinates directly with customers and field technicians to guarantee that Rheem rooftop units are restored to peak operating condition—whether it's a routine tune-up or an urgent emergency repair in the middle of a New York winter.
Application Engineer
Ramil designs and supports Rheem HVAC systems tailored to the unique performance and efficiency requirements of each NYC building. With expertise in equipment selection, technical planning, and code-compliant system design, he ensures every Rheem RTU installation and upgrade delivers long-lasting reliability and measurable energy savings. Ramil's engineering oversight is particularly valuable for Brooklyn and Manhattan properties navigating NYC's Local Law 97 sustainability requirements, helping property owners select the right Rheem equipment to meet both performance goals and carbon emission compliance standards.
Lead Estimator
Farrukh has been a cornerstone of Denair HVAC since 2010, bringing deep expertise in preparing accurate, comprehensive bid proposals for Rheem RTU projects of every scale—from single-unit repairs to multi-site commercial installations across New York. As Lead Estimator, he is responsible for tracking vendor and subcontractor opportunities and ensuring every proposal reflects the true scope of work with no hidden costs. Farrukh's value engineering approach has helped NYC clients save significantly on Rheem RTU projects, consistently delivering proposals that are 90% of the time priced below the competition.
The general rule is: if a Rheem RTU repair costs more than 50% of a new unit's price and the system is over 10 years old, replacement is typically the better investment. Repairs make economic sense for younger units with isolated issues. Denair HVAC provides honest assessments weighing repair cost, system age, energy efficiency, and NYC building compliance requirements before recommending a path forward.
Speak with a Denair HVAC expert for a free, no-obligation consultation about your system.
Denair HVAC provides expert Rheem RTU service across Brooklyn, all five NYC boroughs, and the greater Metro area.
11 Areas Served
Service Coverage
Within 4 Hours
Emergency Response
4.7★ Rated
Customer Rating
Contact us to confirm Rheem RTU service availability at your Brooklyn or NYC location.
Recognized as one of America's fastest-growing companies.
Full OSHA safety compliance on every NYC job site.
Licensed Mechanical/HVAC contractor serving New York State.
Fill out the form below and a Denair HVAC specialist will contact you promptly to discuss your Rheem RTU service needs, provide a free estimate, and schedule a convenient appointment.
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