Rooftop unit
replacement built
for Long Island City
buildings, done right
Full-service RTU replacement engineered for Long Island City's commercial and industrial buildings — from engineering spec through DOB filing and startup. New equipment cuts costs and LL97 exposure.
Our RTU Replacement Services in Long Island City
Engineering-grade rooftop unit replacement for Long Island City's commercial and industrial buildings — sized right, permitted right, and built to last.
Load Calculation & System Design
We engineer replacement RTUs to your building's actual cooling and heating load, not a like-for-like swap — right-sizing prevents the short-cycling that shortens equipment life.
Crane & Rooftop Installation
Crane and rigging management for rooftop access, structural coordination, and certified installation to OEM specifications, handled start to finish by our own crews.
NYC DOB Permit Filing
RTU replacement over a certain tonnage requires DOB filing. We manage the paperwork and inspections so your Long Island City project stays fully compliant without delay.
LL97-Ready Equipment Selection
We spec high-efficiency rooftop units that measurably cut your carbon footprint, positioning Long Island City buildings over 25,000 sq ft ahead of escalating LL97 thresholds.
Fixed-Price Capital Projects
One proposal covers equipment, crane access, labor, permitting, and startup — no change orders once the job begins.
Startup Commissioning & TAB Reporting
Every replacement ends with full startup commissioning and a certified test-and-balance report confirming the new RTU performs to design specification.
From aging RTU to fully replaced
One partner handles design, permitting, and installation.
On-site load survey
A certified technician surveys your existing rooftop unit and building load, typically within the same week, to determine the right replacement size and configuration.
Engineering & equipment spec
We design the replacement to your actual load and prepare the DOB filing package where required, before equipment is ordered.
Fixed-price proposal
You receive one itemized quote covering equipment, crane access, labor, and permitting — no change orders once installation starts.
Installation, commissioning & TAB
Certified crews install the new RTU, complete startup commissioning, and deliver a certified test-and-balance report before project closeout.
Why Long Island City Facility Managers Choose Denair
Factory-Certified Expertise
Factory-trained on Carrier, Trane, AAON, Daikin, Mitsubishi Electric, and LG VRF systems.
Same-Day Long Island City Response
27 technicians in the field, on-site in Long Island City within 4 hours, day or night.
Fixed, Transparent Pricing
You approve the cost before we start — no hourly surprises, no hidden charges.
NYC Code & LL97 Expertise
We understand how repairs intersect with Local Law 97 and DOB requirements.
Success Stories
See how NYC property owners and facility managers count on Denair HVAC.
Meet the Denair NYC Team
Denair HVAC is built by people who've spent their careers keeping NYC buildings comfortable — from the engineers who size every system to the technicians who show up when it matters most.
Questions we hear every day
Straight answers about RTU replacement in Long Island City — no marketing fluff.
How do I know if my rooftop unit needs replacement instead of another repair?
Does Denair manage DOB permitting for RTU replacement in Long Island City?
How does replacing our rooftop unit affect Local Law 97 compliance?
What does RTU replacement cost in Long Island City?
How long does a typical RTU replacement take?
Serving Long Island City and the Greater NYC Metro
From Long Island City's waterfront commercial buildings to suburban facilities across Nassau and Westchester, Denair's certified installation crews cover 11 regions with the same fixed-price approach. We've managed capital HVAC replacement projects across NYC for 19 years — and we understand the roof access, permitting, and logistics that make every building different.
Awards and Recognition
Inc. 5000 Award
Recognized as one of America's fastest-growing companies.
OSHA 40-Hour Certified
Full team compliance with federal workplace safety standards.
Licensed Mechanical Contractor
Registered HVAC contractor fully licensed for NYC commercial work.
Factory-certified to repair the world's
leading rooftop unit brands
Authorized and factory-trained on the RTU manufacturers Long Island City buildings rely on most. This means access to proprietary diagnostic software, genuine parts, extended warranty programs, and the engineering support your rooftop unit deserves.
Get Your Long Island City RTU Replacement Assessment — No Obligation
Tell us about your building and existing rooftop equipment. A Denair specialist will respond within one business day with a clear load assessment and fixed-price proposal — no pressure, no upsell, just straight answers from people who know RTU replacement and Long Island City buildings.