24/7 Emergency Repairs
Certified technicians on call around the clock to diagnose and repair makeup air unit failures fast—typically arriving within 4 hours—handling all major MAU brands from 1/2 to 100 tons.
When your makeup air unit fails, Queens buildings face code violations, uncomfortable occupants, and operational shutdowns. Denair HVAC dispatches certified technicians across Queens—typically within 4 hours—to diagnose and restore your MAU fast. With 19+ years serving NYC's demanding building stock, we keep your ventilation compliant and your operations running around the clock.
Comprehensive emergency and ongoing HVAC solutions for makeup air units and commercial systems across Queens and NYC.
Certified technicians on call around the clock to diagnose and repair makeup air unit failures fast—typically arriving within 4 hours—handling all major MAU brands from 1/2 to 100 tons.
Comprehensive service and repair for all commercial HVAC equipment including makeup air units, covering diagnostics, component replacement, and system restoration with free estimates available.
Proactive MAU maintenance plans that maximize uptime, extend equipment life, and prevent costly emergency failures—with free preventive maintenance included for up to 18 months on new installations.
Targeted retrofits and system tune-ups for aging makeup air units, optimizing performance and energy efficiency to meet current NYC building codes without full system replacement.
Post-repair air testing and balancing with certified reports to confirm your makeup air unit is delivering proper ventilation rates and operating at peak performance after emergency service.
Smart controls and automation solutions for makeup air units that reduce energy costs and ensure optimal ventilation performance year-round in Queens commercial buildings.
The moment you call, our Queens-area dispatch team locates the nearest available certified technician and mobilizes them with a fully equipped service vehicle. In most cases, a technician is on-site within 4 hours, day or night.
See how Denair HVAC has restored critical ventilation systems for Queens businesses and beyond.
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"Denair is the most dependable HVAC service company in New York!"
"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."
"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!"
"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."
"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."
"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."
"Impeccable install. You can tell they're pros the moment they walk in."
"excellent work and quality"
"Denair is professional and courteous."
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"Denair is the most dependable HVAC service company in New York!"
"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."
"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!"
"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."
"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."
"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."
"Impeccable install. You can tell they're pros the moment they walk in."
"excellent work and quality"
"Denair is professional and courteous."
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"Denair is the most dependable HVAC service company in New York!"
"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."
"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!"
"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."
"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."
"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."
"Impeccable install. You can tell they're pros the moment they walk in."
"excellent work and quality"
"Denair is professional and courteous."
Queens buildings can't afford downtime—here's why facility managers and property owners trust Denair HVAC for emergency makeup air unit service.
Same-day emergency service typically within 4 hours, covering Queens and all NYC boroughs around the clock.
Technicians are trained and certified by major HVAC manufacturers, eliminating wait times for brand-specific MAU repairs.
19+ years navigating NYC DOB and DEP ventilation requirements ensures your Queens building stays compliant after every repair.
Fixed proposal pricing means no surprise invoices—all unintended costs are covered at our own expense, guaranteed.
Experienced specialists dedicated to fast, reliable HVAC emergency service.
Founder & CEO
Dennis founded Denair HVAC in March 2007 with a single used truck after a layoff—and built it into a $2M+ revenue company recognized by Inc. 5000 as one of America's fastest-growing businesses. With over 17 years of hands-on HVAC industry experience spanning every aspect of the trade, Dennis established Denair on the values of honesty and commitment that still define every emergency callout across Queens and the greater New York metro area today. His strategic leadership has shaped a team of 28 certified technicians capable of handling commercial HVAC emergencies from 1/2 to 100 tons, ensuring Queens buildings are never left without critical makeup air ventilation.
Service Manager
Thomas leads Denair HVAC's service operations with a relentless focus on fast response times and consistent quality—critical attributes when a makeup air unit fails in a Queens commercial building. He directly coordinates the dispatch of certified technicians, manages scheduling across all five NYC boroughs, and oversees customer communication from the moment an emergency call comes in to final service sign-off. His operational systems are the reason Denair consistently achieves same-day service, typically within 4 hours, ensuring tenants, staff, and building operations remain protected regardless of season or time of day.
Application Engineer
Ramil brings deep technical expertise to every makeup air unit challenge Denair HVAC encounters across Queens and New York City. As Application Engineer, he designs and supports HVAC systems tailored to each building's specific performance and ventilation requirements—selecting the right equipment, developing technical repair plans, and ensuring every solution is both energy-efficient and fully compliant with NYC building codes. When emergency repairs reveal underlying system design issues, Ramil provides the engineering insight needed to prevent recurring failures and extend the lifespan of critical MAU equipment in Queens' diverse commercial building inventory.
An HVAC emergency is any failure that immediately threatens health, safety, building operations, or code compliance. For makeup air units specifically, this includes complete unit shutdown, gas burner failure, loss of ventilation in occupied spaces, frozen or flooded components, control system failure, or situations where the lack of fresh air supply violates NYC Department of Buildings or Department of Health occupancy requirements. Any of these scenarios warrants an immediate emergency service call.
Talk to a certified Denair HVAC technician for fast, expert answers—no obligation required.
Denair HVAC provides emergency makeup air unit service throughout Queens and the entire New York metropolitan area.
11 Regions
Service Area
Within 4 Hours
Emergency Response
24/7 Service
Availability
Contact us to confirm coverage and get an emergency technician dispatched to your location fast.
Named one of America's fastest-growing companies.
Full OSHA safety compliance on every job site.
Trained and certified by major HVAC manufacturers.
Fill out the form below and a Denair HVAC specialist will contact you immediately. For fastest response to an active emergency, call us directly—our dispatch team is available 24/7 and can have a certified technician on-site in Queens typically within 4 hours.
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