Long Island's commercial facilities demand reliable, high-performance rooftop units year-round—from humid summers to harsh winter freezes. Denair HVAC's factory-trained technicians specialize in AAON RTU service, maintenance, and emergency support, keeping your systems running at peak efficiency. With same-day response and customized maintenance contracts, we minimize downtime and protect your HVAC investment.
Comprehensive AAON RTU solutions for Long Island commercial facilities, from routine maintenance to emergency repairs and system upgrades.
Proactive, scheduled maintenance plans tailored to your AAON RTU system. Reduces energy costs, prevents unexpected breakdowns, and extends equipment lifespan with customized annual contracts and free maintenance for up to 18 months on new installations.
Round-the-clock emergency response for AAON RTU failures. Factory-trained technicians arrive fully equipped, typically within 4 hours, to diagnose and restore your system with minimal operational disruption—any season, any time.
Modernize aging AAON RTU equipment with targeted retrofits, expert tune-ups, and mission-critical system enhancements. Optimize performance and energy efficiency without the cost of full system replacement.
Comprehensive service and repair for all AAON RTU components, from controls and refrigerant systems to coils and filters. Licensed technicians deliver lasting fixes backed by quality guarantees and up to 10-year warranties.
Integrate smart controls and automation with your AAON RTU to significantly reduce energy consumption and operating costs. Custom solutions designed for Long Island commercial buildings seeking measurable efficiency gains.
Certified air testing and balancing services to confirm your AAON RTU is operating at peak performance. Includes comprehensive reports ensuring proper airflow, temperature control, and system compliance after any service or installation.
Contact our Long Island service team to book a convenient appointment. We work around your facility's schedule, offering flexible weekday availability and 24/7 emergency dispatch for urgent AAON RTU issues that cannot wait.
See how Long Island and New York Metro facilities trust Denair HVAC to keep their AAON systems running flawlessly.
"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."
"Denair is professional and courteous."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"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."
"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"
"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 am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"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..."
"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."
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"Crew was respectful, fast, and left our place spotless. Five stars."
"excellent work and quality"
"Denair is the most dependable HVAC service company in New York!"
"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."
"Denair is professional and courteous."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"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."
"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"
"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 am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"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..."
"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."
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"Crew was respectful, fast, and left our place spotless. Five stars."
"excellent work and quality"
"Denair is the most dependable HVAC service company in New York!"
"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."
"Denair is professional and courteous."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"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."
"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"
"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 am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"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..."
"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."
"These guys are the best. Installed my central air condition. They are quick, thorough and honest! I definitely recommend them."
"Crew was respectful, fast, and left our place spotless. Five stars."
"excellent work and quality"
"Denair is the most dependable HVAC service company in New York!"
Denair HVAC brings nearly two decades of certified expertise and a proven track record to every AAON RTU service call across Long Island.
Our technicians are trained and certified by AAON and other major manufacturers, ensuring every RTU is serviced to factory standards—no guesswork, no shortcuts.
With 24/7 emergency availability and typical response times within 4 hours, Long Island facilities never face extended downtime waiting for a qualified AAON service team.
Every proposal comes with fixed pricing and a quality guarantee—if our service doesn't meet code requirements, we refund your money. No surprise invoices, ever.
Since 2007, Denair HVAC has served commercial facilities across the New York Metro Area including Nassau and Long Island, building a reputation on honesty and reliability.
Experienced professionals dedicated to keeping your AAON RTU systems running perfectly.
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.
VP Business Development
Anastasiya leads Denair HVAC's business development and new client acquisition strategy, with a focus on building long-term partnerships with property management firms, general contractors, and building owners across Manhattan and the greater NYC metro area. In her role, she identifies market opportunities, develops strategic partnerships, and implements growth initiatives that have helped Denair expand its footprint across some of New York's most recognized property management companies—including AKAM, Douglas Elliman, Related, and Rose Associates. Anastasiya's client-first approach ensures that every new relationship is built on transparency, reliability, and measurable value.
Marketing Manager
Natalja oversees Denair HVAC's brand presence and client relationships, ensuring that building owners, property managers, and facility operators across Manhattan can easily discover and connect with the HVAC expertise they need. As Marketing Manager, she develops and executes strategies that communicate Denair's unique value—from 24/7 emergency availability to Inc. 5000 recognition—to the right audiences across New York City's competitive commercial real estate and residential markets. Her work building public relations and strategic outreach has played a significant role in Denair's growth and continued reputation as one of NYC's most trusted HVAC contractors.
AAON RTU systems are premium commercial units, typically ranging from $15,000 to $80,000+ depending on capacity, configuration, and options. Smaller packaged units (3–10 tons) fall on the lower end, while large custom rooftop units (25–100 tons) command higher prices. Installation, controls integration, and startup costs are additional. Contact Denair HVAC for a detailed quote tailored to your Long Island facility's specific requirements.
Speak with our Long Island AAON specialists for expert guidance and a free service consultation.
Denair HVAC provides certified AAON RTU service and support across Long Island and the entire New York Metro Area.
11+ Regions
Service Area
Within 4 Hours
Emergency Response
400+ Projects
Projects Completed
Contact us to confirm coverage and schedule your AAON RTU service appointment today.
Named one of America's fastest-growing companies by Inc. Magazine.
All technicians hold OSHA 40-hour safety certification for commercial job sites.
Fully licensed and registered HVAC mechanical contractor in New York State.
Fill out the form below and a Denair HVAC specialist will respond promptly to schedule your AAON RTU service, request a maintenance contract proposal, or dispatch emergency support to your Long Island facility.
For immediate assistance, feel free to give us a direct call at 718-791-5074.
For immediate assistance, feel free to give us a direct call at 718-791-5074.