Exhaust Fan Repair
Diagnose and repair malfunctioning roof exhaust fans quickly, restoring proper airflow and preventing heat or moisture buildup in your building. Our certified technicians handle all major fan brands and models.
Long Island City's dense mix of residential buildings, commercial lofts, and industrial spaces demands reliable roof ventilation to combat humidity, heat buildup, and poor air quality. Denair HVAC delivers expert roof ventilation assessments, exhaust fan repairs, and full system replacements — keeping your building comfortable, code-compliant, and energy-efficient year-round.
Comprehensive rooftop ventilation solutions for residential, commercial, and industrial buildings across Long Island City.
Diagnose and repair malfunctioning roof exhaust fans quickly, restoring proper airflow and preventing heat or moisture buildup in your building. Our certified technicians handle all major fan brands and models.
Design and install code-compliant roof ventilation systems tailored to your building's layout, occupancy, and airflow requirements — from single-family homes to large commercial properties in Long Island City.
Replace outdated, inefficient, or failed exhaust fans and ventilation units with modern, energy-efficient equipment. We handle full equipment sourcing, removal, and installation from start to finish.
Proactive maintenance plans to keep roof fans and ventilation systems running at peak efficiency year-round, reducing unexpected failures, extending equipment lifespan, and lowering energy costs.
Around-the-clock emergency response for failed roof exhaust fans or ventilation failures. Our certified technicians arrive fully equipped — typically within 4 hours — to minimize downtime and restore safe airflow.
Upgrade aging roof ventilation and HVAC components with modern, energy-efficient retrofits. We optimize existing systems to improve performance, reduce energy consumption, and meet current NYC building standards.
Our technician visits your Long Island City property to evaluate your existing roof ventilation and exhaust fan systems, identify any performance issues, code deficiencies, or damage caused by the area's humid summers and harsh winters.
See how Denair HVAC has kept Long Island City and NYC buildings comfortable and compliant.
"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..."
"Denair is the most dependable HVAC service company in New York!"
"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"
"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!"
"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 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 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"
"excellent work and quality"
"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."
"Crew was respectful, fast, and left our place spotless. Five stars."
"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..."
"Denair is the most dependable HVAC service company in New York!"
"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"
"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!"
"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 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 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"
"excellent work and quality"
"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."
"Crew was respectful, fast, and left our place spotless. Five stars."
"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..."
"Denair is the most dependable HVAC service company in New York!"
"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"
"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!"
"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 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 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"
"excellent work and quality"
"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."
"Crew was respectful, fast, and left our place spotless. Five stars."
Here's what sets us apart for roof ventilation and fan repair services in Long Island City and across the NYC metro area.
24/7 emergency availability with same-day service — typically on-site within 4 hours anywhere in Queens and Long Island City.
OSHA-certified, manufacturer-trained technicians with 5+ years of experience, fully qualified to meet NYC building code requirements.
Fixed proposal pricing with no surprise costs — we compensate any unintended expenses at our own expense, giving you budget certainty.
Founded in 2007 and recognized by Inc. 5000, Denair HVAC has deep roots serving residential and commercial buildings across the NYC boroughs.
Experienced professionals dedicated to your building's ventilation performance.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with nothing more than a beat-up used truck and a commitment to delivering honest, high-quality HVAC service across New York. With over 17 years of hands-on experience spanning every aspect of the HVAC industry — from rooftop exhaust fan repairs to large-scale commercial installations — Dennis has built Denair into a $2M+ enterprise recognized by the Inc. 5000 as one of America's fastest-growing companies. His leadership philosophy centers on transparency, technical excellence, and a genuine desire to ensure no building owner or tenant in Long Island City or across NYC is left dealing with failed ventilation or uncomfortable conditions.
Service Manager
Thomas leads Denair HVAC's service operations across the NYC metro area, including Long Island City, ensuring that every roof ventilation and exhaust fan repair job is executed with speed, precision, and professionalism. He is responsible for technician coordination, efficient scheduling, and seamless customer communication from the first call through to job completion. Thomas's focus on fast response times and consistent service quality means that building owners and property managers can rely on Denair to minimize downtime and keep their ventilation systems performing reliably — whether it's a routine repair or an urgent emergency callout.
Application Engineer
Ramil brings deep technical expertise to every roof ventilation and fan installation project at Denair HVAC. He designs and supports HVAC and ventilation systems tailored to each building's unique performance, occupancy, and energy efficiency needs — from multi-family residential buildings in Long Island City to commercial and industrial spaces across the five boroughs. Ramil oversees equipment selection, technical planning, and application support to ensure every system is energy-efficient, code-compliant, and built for long-term reliability. His engineering-driven approach ensures that solutions are both cost-effective and optimized for New York's demanding climate conditions.
Roof exhaust fan replacement in Long Island City typically ranges from $300 to $1,500 or more, depending on the fan size, motor type, access complexity, and whether ductwork modifications are needed. Commercial units on large buildings can cost significantly more. Denair HVAC provides free, itemized estimates with fixed proposal pricing so you know the full cost upfront — no surprises.
Speak with a certified Denair HVAC technician for a free, no-obligation consultation.
Denair HVAC serves Long Island City and surrounding NYC boroughs and metro counties with expert roof ventilation services.
NYC & 11 Counties
Service Area
Within 4 Hours
Emergency Response
400+ Projects
Projects Completed
Contact us to confirm coverage and schedule your free roof ventilation assessment today.
Named one of America's fastest-growing companies.
All technicians OSHA-certified for safe jobsite operations.
Licensed Mechanical/HVAC Contractor operating in New York.
Fill out the form below and a Denair HVAC specialist will contact you promptly to discuss your roof ventilation or exhaust fan repair needs, provide a free estimate, and schedule a convenient on-site visit.
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