HVAC Installation
Turnkey commercial HVAC installation with full project management, in-shop ductwork fabrication, controls, and commissioning. Save up to 35% through value engineering on projects from $10K to $5M.
Long Island City's dense mix of commercial towers, converted loft offices, and mixed-use developments demands HVAC systems that perform year-round—through humid Queens summers and bitter winter cold snaps. Denair HVAC brings 19+ years of NYC commercial expertise, value-engineered pricing, and 24/7 emergency support to keep your building's climate systems running at peak efficiency without breaking your budget.
End-to-end commercial HVAC solutions for Long Island City businesses—from new installations to emergency repairs and compliance.
Turnkey commercial HVAC installation with full project management, in-shop ductwork fabrication, controls, and commissioning. Save up to 35% through value engineering on projects from $10K to $5M.
Licensed technicians service, maintain, and repair all commercial HVAC equipment. Free estimates available with same-day response—usually within 4 hours—for Long Island City properties.
Customized maintenance plans that maximize efficiency, extend equipment lifespan, and reduce energy costs. Includes free preventative maintenance for up to 18 months on all new installations.
Certified technicians on call around the clock to diagnose and restore critical HVAC systems. Handles all major brands from 1/2 to 100 tons—minimal operational disruption guaranteed.
Smart controls and automation solutions designed to significantly cut energy costs and environmental impact—ideal for Long Island City's growing class-A commercial buildings pursuing LL97 compliance.
Targeted retrofits and expert system tune-ups to modernize outdated equipment, optimize performance, and meet current energy standards without costly full replacements.
Long Island City's rapidly expanding commercial corridors—from Court Square high-rises to converted industrial spaces near the waterfront—require HVAC systems that balance performance with cost. Denair HVAC delivers fully managed commercial installations, repairs, and maintenance with fixed proposal pricing, a 10-year extended warranty option, and a Terms Guarantee ensuring on-time delivery. Our 28 certified technicians average 5+ years of NYC commercial experience, and value engineering consistently saves clients 24–35% compared to competing bids.
See how Long Island City and NYC businesses have saved thousands and improved comfort with Denair HVAC.
"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!"
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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 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..."
"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"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Crew was respectful, fast, and left our place spotless. Five stars."
"Impeccable install. You can tell they're pros the moment they walk in."
"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."
"Amazing HVAC vendor who is doing multiple accounts for my company."
"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."
"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 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!"
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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 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..."
"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"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Crew was respectful, fast, and left our place spotless. Five stars."
"Impeccable install. You can tell they're pros the moment they walk in."
"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."
"Amazing HVAC vendor who is doing multiple accounts for my company."
"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."
"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 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!"
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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 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..."
"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"
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Crew was respectful, fast, and left our place spotless. Five stars."
"Impeccable install. You can tell they're pros the moment they walk in."
"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."
"Amazing HVAC vendor who is doing multiple accounts for my company."
"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."
"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!"
Discover what makes us Long Island City's most trusted commercial HVAC contractor.
Clients save up to 35% on HVAC budgets through alternative approved equipment of equal performance—saving over $186,000 in commercial NYC projects in just 6 months.
All unintended costs compensated at our own expense, with a Terms Guarantee of 0.1% per day of project delay—protecting Long Island City clients from budget surprises.
Around-the-clock emergency repairs with same-day service typically within 4 hours, so Queens commercial operations never face prolonged HVAC downtime.
Named one of America's fastest-growing companies, backed by 19+ years serving NYC's commercial sector with a 4.7-star rated team of 28 certified technicians.
Experienced professionals committed to commercial HVAC excellence across NYC.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with nothing more than a beat-up used truck and 7 years of hands-on industry experience. Over the following years, he transformed that one-man operation into a $2M+ revenue company recognized by Inc. 5000 as one of America's fastest-growing businesses. With over 17 years of expertise spanning every aspect of commercial HVAC—from installation and engineering to service and compliance—Dennis leads the company's strategic vision with a focus on honesty, value, and delivering results for NYC commercial clients, including those in Long Island City's booming commercial market.
Service Manager
Thomas leads Denair HVAC's service operations with a sharp focus on fast response times, efficient technician scheduling, and consistent service quality across every job site. He serves as the central coordinator between field technicians and commercial clients, ensuring that Long Island City and Queens businesses experience minimal disruption during repairs and maintenance visits. Thomas's systematic approach to crew management and customer communication means that from the moment a service call is placed to final sign-off, every step is handled professionally, reducing downtime and delivering a seamless service experience from start to finish.
Application Engineer
Ramil is the technical backbone of Denair HVAC's engineering capability, designing and supporting HVAC systems precisely tailored to each commercial building's performance and efficiency requirements. He oversees equipment selection, technical planning, and application support to ensure that every system installed in Long Island City's diverse commercial building stock—from glass-curtain-wall offices in Court Square to older industrial conversions—delivers long-lasting reliability, measurable energy savings, and full code compliance. Ramil's work ensures clients receive engineered solutions, not off-the-shelf guesses.
Lead Estimator
Farrukh has been an integral part of the Denair HVAC team since 2010, bringing over a decade of expertise in preparing comprehensive, accurate, and competitive bid proposals. As Lead Estimator, he is responsible for tracking opportunities across vendors, subcontractors, and commercial clients throughout NYC—including Long Island City's growing development pipeline. Farrukh's meticulous approach to scope breakdowns, alternates, and revisions is a core reason Denair consistently delivers value-engineered proposals that save commercial clients 24–35% compared to standard market pricing.
Denair HVAC services a wide range of commercial properties in Long Island City and across Queens, including office buildings, retail stores, multi-family residential buildings, medical facilities, fitness centers, restaurants, and industrial spaces. Whether you manage a small commercial suite in a converted loft or a large class-A tower near Court Square, our teams are equipped to handle jobs from $10,000 to $5,000,000.
Speak directly with a Denair HVAC specialist for a free consultation tailored to your Long Island City property.
Denair HVAC serves commercial properties across Long Island City, Queens, and the entire New York Metro Area.
NYC & Metro
Service Area
24/7 Service
Emergency Availability
4.7★ Rated
Customer Rating
Contact us to confirm coverage and get a free commercial HVAC estimate for your property.
Recognized as one of America's fastest-growing companies.
Full team compliance with OSHA safety and worksite standards.
Licensed and registered HVAC contractor in New York State.
Fill out the form below and a Denair HVAC specialist will reach out promptly to discuss your project, provide a detailed scope, and deliver a value-engineered proposal—with no obligation.
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