MAU Diagnostics & Inspection
Thorough diagnostic assessment of your makeup air unit to identify faults, airflow imbalances, control failures, or mechanical wear before they escalate into costly breakdowns.
Brooklyn's dense commercial buildings, restaurants, and industrial spaces depend on properly functioning makeup air units to maintain safe indoor air quality and code compliance. Denair HVAC delivers expert MAU diagnostics, repairs, and tune-ups across Brooklyn and all NYC boroughs—with same-day service usually within 4 hours and certified technicians ready to restore your system fast.
Comprehensive MAU repair and maintenance solutions for commercial and residential properties across Brooklyn and NYC.
Thorough diagnostic assessment of your makeup air unit to identify faults, airflow imbalances, control failures, or mechanical wear before they escalate into costly breakdowns.
Around-the-clock emergency repair service for failed makeup air units. Certified technicians arrive fully equipped, typically within 4 hours, to restore safe ventilation and code-compliant air supply.
Proactive MAU maintenance plans that extend equipment life, maintain peak efficiency, reduce energy costs, and prevent unexpected failures in Brooklyn's demanding commercial environments.
Expert repair and recalibration of makeup air unit control systems and building management system integrations to ensure precise temperature, humidity, and airflow regulation.
Targeted retrofits and component upgrades for aging makeup air units—improving performance, energy efficiency, and compliance with current NYC mechanical codes without full system replacement.
Certified air testing and balancing services following MAU repairs to verify the system is delivering the correct airflow volumes and pressures, with documented reports provided upon completion.
Brooklyn's restaurants, commercial kitchens, retail spaces, and multi-family buildings rely on makeup air units to replace exhausted air and maintain safe, comfortable indoor environments year-round. When an MAU fails, Denair HVAC's licensed technicians respond fast—usually within 4 hours—to diagnose and repair all major brands and unit sizes from ½ to 100 tons. With over 19 years serving NYC, our team ensures your building stays ventilated, code-compliant, and operational with minimal disruption.
See how Denair HVAC has restored comfort and compliance for commercial clients across Brooklyn and NYC.
"I am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"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."
"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..."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Denair is the most dependable HVAC service company in New York!"
"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."
"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!"
"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."
"excellent work and quality"
"Amazing HVAC vendor who is doing multiple accounts for my company."
"I am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"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."
"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..."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Denair is the most dependable HVAC service company in New York!"
"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."
"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!"
"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."
"excellent work and quality"
"Amazing HVAC vendor who is doing multiple accounts for my company."
"I am very pleased with the service and professionalism we receive from all the techs and staff at Denair."
"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."
"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..."
"Really great to work with, awesome staff, happy to work with them anytime again in the future! Highly recommend."
"Denair is the most dependable HVAC service company in New York!"
"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."
"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!"
"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."
"excellent work and quality"
"Amazing HVAC vendor who is doing multiple accounts for my company."
Brooklyn and NYC property owners trust Denair HVAC for makeup air unit repairs because we combine speed, expertise, and transparency on every job.
We dispatch certified technicians across Brooklyn and all NYC boroughs, typically arriving within 4 hours of your call.
Our technicians are trained and certified by major HVAC manufacturers, handling all brands and unit sizes up to 100 tons.
We ensure every MAU repair meets New York City mechanical codes and Local Law requirements, protecting your building from violations.
Fixed proposal pricing with no hidden costs—all unintended expenses are covered at our own expense, guaranteed.
Experienced professionals dedicated to delivering superior HVAC service across Brooklyn and NYC.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with a single used truck and a vision to bring honest, affordable HVAC service to New York. With over 17 years of hands-on experience across every aspect of the HVAC industry—from residential repairs to large-scale commercial installations—Dennis 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. His leadership has established Denair as a trusted name for makeup air unit repair and commercial HVAC services throughout Brooklyn and the greater NYC metro area.
Service Manager
Thomas leads Denair HVAC's service operations with a focus on fast response times, precise scheduling, and consistent quality across every repair job. For makeup air unit service calls throughout Brooklyn and the five boroughs, Thomas coordinates technician dispatch, customer communication, and job execution to ensure systems are restored with minimal downtime. His systematic approach to service management means clients experience a smooth, professional repair process from the initial call through final sign-off—keeping commercial kitchens, retail spaces, and multi-family buildings properly ventilated and fully operational.
Application Engineer
Ramil brings deep technical expertise to every makeup air unit repair project, designing and supporting HVAC solutions tailored to each Brooklyn building's unique layout, occupancy load, and performance requirements. He oversees equipment selection, technical planning, and engineering support to ensure that repaired or upgraded MAU systems deliver long-lasting reliability, energy efficiency, and full compliance with NYC mechanical codes. Ramil's application engineering background means clients receive not just a quick fix, but a properly engineered solution that protects their HVAC investment for years to come.
Lead Estimator
Farrukh has been a cornerstone of the Denair HVAC team since 2010, bringing over a decade of estimating expertise to every makeup air unit repair and commercial HVAC project. He is responsible for preparing accurate, comprehensive bid proposals in a timely manner and maintaining strong relationships with vendors, subcontractors, and clients across Brooklyn and the wider NYC market. Farrukh's meticulous approach to scope breakdowns and value engineering ensures clients receive competitive, transparent pricing—consistently helping properties save on repair and maintenance costs without compromising on quality or compliance.
A makeup air unit (MAU) replaces air exhausted from a building by commercial hoods, exhaust fans, or HVAC systems, maintaining proper air pressure and indoor air quality. Over time, components such as burners, motors, filters, controls, and dampers wear out or malfunction. Without timely repair, a faulty MAU can cause negative pressure, poor ventilation, code violations, and uncomfortable or unsafe indoor conditions.
Speak with a certified Denair HVAC technician for a free consultation and same-day assessment.
Denair HVAC provides makeup air unit repair services across Brooklyn, all NYC boroughs, and surrounding counties.
11+ Regions
Service Area
24/7 On-Call
Emergency Availability
Within 4 Hours
Response Time
Contact us to confirm coverage and schedule your makeup air unit repair today.
Named one of America's fastest-growing companies.
Full OSHA safety compliance on every job site.
Licensed mechanical contractor operating across New York.
Fill out the form below and a Denair HVAC specialist will reach out promptly to assess your MAU issue, provide a free estimate, and schedule same-day or next-available service at your Brooklyn or NYC location.
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