Diagnostics & Troubleshooting
In-depth electrical, mechanical, and controls diagnostics on AAON RN Series units to accurately identify faults, error codes, and performance issues before initiating targeted repairs.
Long Island City's commercial buildings demand HVAC precision—and AAON RN Series units are built for exactly that. Denair HVAC's manufacturer-trained technicians deliver fast, reliable repairs to keep your rooftop equipment running at peak performance year-round. From diagnostics to full component restoration, we minimize downtime and protect your investment with same-day response and transparent pricing.
Comprehensive repair and maintenance solutions for AAON RN Series rooftop units, keeping your Long Island City facility comfortable and compliant.
In-depth electrical, mechanical, and controls diagnostics on AAON RN Series units to accurately identify faults, error codes, and performance issues before initiating targeted repairs.
Around-the-clock emergency response for failed AAON RN Series equipment. Manufacturer-trained technicians arrive fully equipped—typically within 4 hours—to restore operations with minimal disruption.
Proactive AAON RN Series maintenance plans that maximize efficiency, extend equipment lifespan, reduce energy costs, and prevent costly breakdowns throughout the demanding New York seasons.
Expert replacement of compressors, coils, controls boards, fans, and refrigerant components using OEM-quality parts to restore full AAON RN Series functionality and efficiency.
Performance optimization and retrofit services for aging AAON RN Series units, enhancing energy efficiency and comfort without requiring a full system replacement.
Repair and reconfiguration of AAON RN Series control systems and building management system integrations to ensure accurate operation, scheduling, and energy management.
Contact Denair HVAC by phone or online. Our Long Island City-area dispatch team confirms your location, gathers equipment details, and schedules a technician visit—often the same day for urgent AAON RN Series failures.
See how Long Island City businesses and NYC property managers rely on Denair HVAC for dependable AAON RN Series repairs.
"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."
"Crew was respectful, fast, and left our place spotless. Five stars."
"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!"
"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 was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"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..."
"excellent work and quality"
"Denair is the most dependable HVAC service company in New York!"
"Impeccable install. You can tell they're pros the moment they walk in."
"Denair is professional and courteous."
"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"
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"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."
"Crew was respectful, fast, and left our place spotless. Five stars."
"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!"
"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 was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"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..."
"excellent work and quality"
"Denair is the most dependable HVAC service company in New York!"
"Impeccable install. You can tell they're pros the moment they walk in."
"Denair is professional and courteous."
"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"
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"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."
"Crew was respectful, fast, and left our place spotless. Five stars."
"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!"
"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 was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"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..."
"excellent work and quality"
"Denair is the most dependable HVAC service company in New York!"
"Impeccable install. You can tell they're pros the moment they walk in."
"Denair is professional and courteous."
"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"
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
Long Island City facilities need a repair partner they can count on. Here's what sets Denair HVAC apart for AAON RN Series service.
Certified and trained by major manufacturers including AAON, ensuring precise, warranty-compliant repairs every time.
Emergency technicians dispatched across Long Island City and Queens—typically on-site within 4 hours of your call.
All proposals include fixed pricing with no surprise add-ons; unintended costs are always covered at our own expense.
Serving NYC's commercial buildings since 2007, with deep knowledge of Queens and Long Island City's facility requirements and codes.
Experienced professionals dedicated to keeping your HVAC systems running reliably.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with a single used truck and a vision to deliver honest, high-quality HVAC service to New York. With over 17 years of hands-on industry experience, he has grown the company from a one-man operation to a $2M+ revenue enterprise recognized by Inc. 5000 as one of America's fastest-growing companies. Dennis leads Denair's strategic direction, ensuring every client—from Long Island City commercial properties to Manhattan high-rises—receives the same commitment to quality, transparency, and technical excellence that has defined the company since its founding.
Service Manager
Thomas leads Denair HVAC's service operations across New York, overseeing fast response times, efficient technician scheduling, and consistent service quality for every repair job. He coordinates field technicians and customer communication to minimize system downtime and deliver a seamless service experience from the initial call to final sign-off. For clients in Long Island City and Queens relying on AAON RN Series rooftop equipment, Thomas ensures that the right certified technician arrives promptly, fully equipped, and ready to restore operations with minimal disruption to daily business activities.
Application Engineer
Ramil designs and supports HVAC systems tailored to each building's specific performance and efficiency requirements. He oversees equipment selection, technical planning, and application engineering support to ensure long-lasting reliability, energy savings, and full code compliance. For AAON RN Series repairs and upgrades in Long Island City, Ramil provides the technical backbone—evaluating system configurations, recommending optimal component replacements, and ensuring that every repair solution is engineered to meet both manufacturer specifications and New York City building code standards. His expertise helps clients maximize the return on their HVAC investment.
Lead Estimator
Farrukh has been a cornerstone of Denair HVAC since 2010, bringing deep expertise in bid proposal preparation, cost estimation, and vendor coordination. As Lead Estimator, he ensures every AAON RN Series repair quote is comprehensive, accurate, and delivered in a timely manner—giving Long Island City clients full visibility into project scope and cost before work begins. Farrukh tracks opportunities with vendors, subcontractors, and customers to ensure competitive, transparent pricing that consistently comes in below market rates, reflecting Denair's commitment to affordability without compromising on quality or technical standards.
To request AAON RN Series repair service through Denair HVAC, simply call us at 718-791-5074 or 212-776-1333 during business hours, or reach out for 24/7 emergency service. Provide your unit model, location, and a description of the issue. Our dispatch team will schedule a manufacturer-trained technician—often the same day for urgent repairs in Long Island City and Queens.
Talk to our certified HVAC experts for a free consultation and same-day service options.
Denair HVAC serves commercial and residential properties across Long Island City, Queens, and the greater NYC metro region.
11+ Regions
Service Area
24/7 Service
Emergency Availability
4.7★ Rated
Customer Rating
Contact us to confirm coverage and schedule your AAON RN Series repair today.
Named one of America's fastest-growing companies.
All technicians hold full OSHA safety certification.
Fully licensed mechanical contractor in New York State.
Fill out the form below and a Denair HVAC specialist will respond promptly. For emergencies, call us directly at 718-791-5074 for same-day service—typically within 4 hours.
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