24/7 Emergency Repairs
Certified technicians on call around the clock to diagnose and restore your HVAC system—usually within 4 hours. Equipped to handle all major brands from ½ to 100 tons of cooling capacity with minimal disruption.
Manhattan's dense high-rises, aging infrastructure, and extreme seasonal swings demand HVAC expertise that never clocks out. Denair HVAC delivers round-the-clock heating, cooling, and ventilation solutions—from emergency repairs to full installations—keeping your building comfortable and code-compliant no matter the hour or the borough's unpredictable weather.
Comprehensive heating, cooling, and ventilation solutions for residential and commercial properties across Manhattan and all NYC boroughs.
Certified technicians on call around the clock to diagnose and restore your HVAC system—usually within 4 hours. Equipped to handle all major brands from ½ to 100 tons of cooling capacity with minimal disruption.
Turnkey commercial HVAC installation with end-to-end project management, in-shop ductwork fabrication, and value engineering that saves clients up to 35% on equipment, ductwork, piping, and controls.
Proactive maintenance plans that extend system lifespan, reduce energy costs, and prevent surprise breakdowns. Free preventative maintenance included for up to 18 months on all new installations.
Modernize outdated equipment with targeted retrofits and expert tuning to optimize performance and meet current energy standards—without the cost of a full system replacement.
Smart controls and building automation solutions designed to significantly reduce energy costs and environmental impact, helping Manhattan properties meet NYC's evolving sustainability standards.
Expert guidance through NYC's Local Law 97 sustainability mandates, helping building owners and property managers avoid penalties and transition to compliant, energy-efficient HVAC systems.
Manhattan's mix of pre-war co-ops, modern office towers, and mission-critical facilities demands HVAC service that matches the city's pace. Denair HVAC's 28 certified technicians bring over 19 years of New York experience to every call—residential or commercial, routine or urgent. With same-day response typically within 4 hours, value-engineered pricing, and a 10-year warranty option on new equipment, we make sure no tenant, employee, or patient is ever left in the heat or cold.
See how Denair HVAC has delivered reliable comfort and real savings for businesses and residents across New York.
"Denair is the most dependable HVAC service company in New York!"
"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."
"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 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."
"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..."
"Crew was respectful, fast, and left our place spotless. Five stars."
"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!"
"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."
"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."
"Amazing HVAC vendor who is doing multiple accounts for my company."
"Impeccable install. You can tell they're pros the moment they walk in."
"excellent work and quality"
"Denair is professional and courteous."
"Denair is the most dependable HVAC service company in New York!"
"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."
"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 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."
"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..."
"Crew was respectful, fast, and left our place spotless. Five stars."
"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!"
"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."
"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."
"Amazing HVAC vendor who is doing multiple accounts for my company."
"Impeccable install. You can tell they're pros the moment they walk in."
"excellent work and quality"
"Denair is professional and courteous."
"Denair is the most dependable HVAC service company in New York!"
"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."
"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 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."
"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..."
"Crew was respectful, fast, and left our place spotless. Five stars."
"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!"
"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."
"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."
"Amazing HVAC vendor who is doing multiple accounts for my company."
"Impeccable install. You can tell they're pros the moment they walk in."
"excellent work and quality"
"Denair is professional and courteous."
Here's what sets Denair HVAC apart from every other HVAC contractor serving Manhattan and the greater NYC area.
Emergency technicians respond across Manhattan and all five boroughs, typically arriving within 4 hours any time of day.
All 28 technicians hold OSHA 40-hour, Scaffolding, and major manufacturer certifications—meeting NYC's strict building safety requirements.
Value Engineering has saved NYC clients over $186,000 on HVAC installation in recent months, with proposals optimized up to 35%.
Named one of America's fastest-growing companies—a testament to consistent quality and client trust built over 19 years in New York.
The experienced professionals keeping Manhattan comfortable year-round.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with a single used truck and a determination to bring honest, affordable HVAC service to New York. Over 17 years later, he has grown the company to a team of 28 certified professionals handling projects from $10,000 to $5,000,000 across Manhattan, Brooklyn, and the entire NYC metro area. Under his strategic leadership, Denair reached $2 million in annual revenue within just five years and earned recognition from Inc. 5000 as one of America's fastest-growing companies. Dennis's vision—rooted in transparency, quality, and genuine care for clients—continues to drive every decision the company makes.
Service Manager
Thomas leads Denair HVAC's service operations across Manhattan and the greater NYC metro, ensuring that every technician dispatch is fast, every schedule is optimized, and every client interaction reflects the company's commitment to reliability. He coordinates field technicians and customer communications with precision, minimizing equipment downtime for building managers, retail operators, and residential clients throughout the five boroughs. Thomas's operational discipline is a key reason Denair consistently delivers same-day service—typically within 4 hours—even for the most time-sensitive emergency repairs in Manhattan's demanding commercial and residential environments.
Application Engineer
Ramil designs and engineers HVAC systems tailored precisely to the performance and efficiency demands of each Manhattan building—whether a pre-war co-op in the Upper West Side, a medical facility in Midtown, or a high-traffic retail flagship on Fifth Avenue. He oversees equipment selection, technical planning, and application support from concept through commissioning, ensuring every system delivers long-term reliability, measurable energy savings, and full compliance with NYC building codes and Local Law 97 mandates. Ramil's technical rigor is integral to Denair's ability to offer solutions that are both innovative and cost-effective.
Lead Estimator
Farrukh has been a cornerstone of Denair HVAC since 2010, bringing nearly 15 years of estimating expertise to every commercial and residential bid across Manhattan and the NYC metro. He is responsible for crafting comprehensive, accurate proposals in a timely manner—tracking opportunities with vendors, subcontractors, and clients while delivering the detailed scope breakdowns and alternates that help building owners and property managers make informed decisions. His command of value engineering is central to Denair's ability to consistently offer pricing 90% lower than the competition without compromising on quality or compliance.
VP Business Development
Anastasiya drives Denair HVAC's growth across Manhattan's competitive commercial landscape, identifying new market opportunities and forging strategic partnerships with property managers, general contractors, and facility operators throughout New York City. As VP of Business Development, she leads new client acquisition and oversees the development and implementation of sales strategies that align with Denair's mission to deliver affordable, high-quality HVAC solutions to the NYC metro area. Her work has been instrumental in expanding Denair's client base to include globally recognized brands and major residential property management companies across the five boroughs.
Financial Manager
Tanya brings over 15 years of financial expertise to Denair HVAC, overseeing all aspects of accounting, budgeting, forecasting, and insurance across the company's growing portfolio of Manhattan and NYC metro projects. Her financial stewardship ensures that Denair can honor its commitment to fixed proposal pricing—absorbing unintended costs rather than passing them to clients—and maintain the financial stability needed to scale from neighborhood service calls to multi-million-dollar capital improvement projects. Tanya's precision and reliability behind the scenes are as essential to Denair's reputation as the technicians working in the field.
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.
The Greenheck Group is a leading manufacturer of air movement, control, and conditioning equipment, including fans, ventilators, dampers, louvers, kitchen ventilation systems, and energy recovery units. Their products are widely used in commercial, industrial, and institutional HVAC applications. Denair HVAC is trained and certified to service and install equipment from major manufacturers including Greenheck.
Our certified HVAC experts are available 24/7 to answer your questions and provide a free estimate.
Denair HVAC serves Manhattan and the entire NYC metro area, covering all five boroughs and surrounding counties.
11 Regions
Service Area
Within 4 Hours
Emergency Response
400+ Projects
Projects Completed
Contact us to confirm coverage and schedule your free HVAC estimate today.
Recognized as one of America's fastest-growing companies.
All technicians hold full OSHA safety certification.
Licensed Mechanical/HVAC Contractor operating across New York.
Whether it's an emergency repair at 2 AM or a planned installation for your commercial property, Denair HVAC is ready to help. Fill out the form below and one of our certified HVAC specialists will reach out promptly with a free estimate and next steps.
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