Liebert Unit Installation
Turnkey installation of Liebert precision cooling systems tailored to your data center layout, load requirements, and redundancy specifications — handled by certified technicians with end-to-end project management.
Data centers demand uncompromising climate control — a single degree of thermal drift can trigger costly downtime. Denair HVAC delivers expert installation, maintenance, and emergency repair of Liebert precision cooling systems across New York's five boroughs and metro area, ensuring your critical infrastructure stays protected, efficient, and compliant year-round.
Comprehensive Liebert cooling solutions designed to protect uptime, efficiency, and compliance in mission-critical data center environments.
Turnkey installation of Liebert precision cooling systems tailored to your data center layout, load requirements, and redundancy specifications — handled by certified technicians with end-to-end project management.
Proactive, scheduled maintenance programs that maximize Liebert unit uptime, preserve warranty coverage, extend equipment lifespan, and prevent unexpected failures in temperature-sensitive server environments.
Round-the-clock emergency response for Liebert cooling failures. Certified technicians arrive typically within 4 hours, fully equipped to diagnose and restore critical cooling operations with minimal disruption.
Modernize aging Liebert infrastructure with targeted retrofits and performance tuning to meet current energy standards, improve cooling capacity, and ensure continued compliance for mission-critical facilities.
Smart controls and automation solutions integrated with Liebert systems to reduce energy consumption, lower operating costs, and minimize the environmental footprint of your data center cooling infrastructure.
Post-installation testing and balancing services for Liebert systems, providing certified reports confirming optimal airflow, temperature uniformity, and full compliance with data center performance standards.
Our application engineers conduct a thorough on-site evaluation of your data center's thermal load, existing infrastructure, and spatial constraints — factoring in New York building codes and density requirements to design the right Liebert solution.
See how New York data centers and mission-critical facilities trust Denair HVAC for precision cooling excellence.
"I was able to upgrade my cooling towers through the help of Denair and I did love their Service rendered, Wonderful Experience."
"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."
"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."
"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!"
"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."
"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"
"Impeccable install. You can tell they're pros the moment they walk in."
"excellent work and quality"
"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!"
"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."
"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"
"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."
"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."
"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."
"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!"
"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."
"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"
"Impeccable install. You can tell they're pros the moment they walk in."
"excellent work and quality"
"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!"
"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."
"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"
"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."
"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."
"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."
"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!"
"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."
"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"
"Impeccable install. You can tell they're pros the moment they walk in."
"excellent work and quality"
"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!"
"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."
"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"
"Denair is the most dependable HVAC service company in New York!"
We bring manufacturer-certified expertise, proven reliability, and a mission-critical mindset to every Liebert precision cooling project across the New York metro area.
Technicians trained and certified by major manufacturers including Liebert, ensuring code-compliant installations and repairs that protect your equipment warranty.
Around-the-clock availability with typical on-site response within 4 hours — critical for NYC data centers where cooling failures can't wait until morning.
Over 19 years serving Manhattan, Brooklyn, Queens, and the broader metro area, with deep knowledge of New York building codes and mission-critical facility standards.
Guaranteed proposal pricing with all unintended costs covered at our expense, plus up to 10-year extended warranties on every piece of equipment installed.
Experienced professionals dedicated to precision cooling excellence in New York.
Founder & CEO
Dennis founded Denair HVAC in March 2007 after seven years in the HVAC service industry — starting with one man and a beat-up used truck in Brooklyn. Over the past 19+ years, he has built Denair into a recognized Inc. 5000 company with $2M+ in annual revenue, a 28-person team, and a portfolio spanning over 400 projects across New York City's five boroughs and metro area. Dennis holds deep expertise across all facets of the HVAC business, from mission-critical precision cooling to large-scale commercial installations, and leads the company's strategic vision with a commitment to honesty, quality, and delivering measurable value to every client.
Service Manager
Thomas leads Denair HVAC's service operations with a focus on the precision and responsiveness that mission-critical environments demand. He oversees technician scheduling, 24/7 emergency dispatch, and customer communication to ensure Liebert and other precision cooling systems receive fast, reliable attention whenever issues arise. Thomas's coordination role is central to Denair's ability to deliver same-day service — typically within 4 hours — across New York City's data centers, medical facilities, and commercial buildings. His operational discipline ensures consistent service quality, minimal system downtime, and a seamless experience from the first call to final resolution.
Application Engineer
Ramil is the technical backbone of Denair HVAC's precision cooling design capability. As Application Engineer, he designs and supports HVAC and precision cooling systems — including Liebert configurations — tailored to each facility's specific thermal load, redundancy requirements, and energy efficiency targets. Ramil oversees equipment selection, technical planning, and application support from concept through commissioning, ensuring every Liebert installation delivers long-term reliability, measurable energy savings, and full compliance with New York City building codes and data center standards. His engineering precision is a key reason clients trust Denair for their most critical cooling infrastructure.
Lead Estimator
Farrukh has been an integral part of Denair HVAC since 2010, bringing deep expertise in bid preparation, value engineering, and scope management for complex HVAC and precision cooling projects. As Lead Estimator, he is responsible for preparing comprehensive, timely proposals for Liebert system installations, retrofits, and maintenance contracts — consistently identifying cost-saving opportunities that have helped clients save over $186,000 on commercial HVAC projects in New York. Farrukh maintains strong relationships with vendors, subcontractors, and clients, ensuring every proposal delivers a competitive, transparent price with clearly defined scope, alternates, and revisions.
A properly maintained Liebert precision cooling unit typically has a service life of 15 to 20 years. Lifespan depends heavily on operational load, environmental conditions, and the consistency of preventive maintenance. Units in high-demand data center environments benefit significantly from scheduled servicing — including filter changes, coil cleaning, and refrigerant checks — which Denair HVAC provides through customized maintenance contracts.
Our certified precision cooling experts are ready to answer your questions and assess your facility's needs.
Denair HVAC provides Liebert precision cooling services across New York City and the greater metro area, reaching data centers and mission-critical facilities throughout the region.
11 Counties & Boroughs
Service Area
Within 4 Hours
Emergency Response
400+ Projects
Projects Completed
Contact us to confirm coverage and schedule a site assessment for your facility.
Named one of America's fastest-growing companies in 2019.
All technicians hold OSHA 40-hour safety certification.
Licensed Mechanical/HVAC Contractor registered in New York State.
Complete the form below and a Denair HVAC precision cooling specialist will reach out to schedule your site assessment, discuss your Liebert system requirements, and provide a transparent, no-obligation proposal.
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