Keep Your Systems Running.
Before They Don't.
Denair HVAC's customized preventive maintenance plans protect your building's HVAC investment — eliminating surprise failures, reducing energy waste, and keeping you ahead of LL97 compliance across all five boroughs.
Technician on rooftop unit
Every Visit. Every System. Fully Covered.
Our preventive maintenance visits are scheduled around your operations and leave nothing to chance. Here's what our certified technicians deliver on every service call.
Full System Inspection
Comprehensive evaluation of all HVAC components — from rooftop units and air handlers to condensers, chillers, and distribution systems. We document baseline conditions and flag developing issues before they escalate.
Coil Cleaning & Filter Service
Dirty coils are the number-one cause of efficiency loss and premature equipment failure. We clean evaporator and condenser coils, replace filters, and clear drain pans — restoring your system to peak thermal performance.
Electrical & Controls Check
We test contactors, capacitors, safeties, and control boards for signs of wear or failure. BMS/BAS setpoints and scheduling are verified against current occupancy needs to prevent energy waste and comfort complaints.
Refrigerant Level Verification
We check refrigerant charge and inspect for leaks. As A2L refrigerants phase in under the AIM Act, our technicians are certified for both legacy and next-generation refrigerant management.
Mechanical Tune-Up
Belts, bearings, and pulleys are inspected and lubricated. Worn components are flagged for replacement before failure. Motor amperage is measured to identify units drawing excessive power.
Written Service Report
Every visit concludes with a detailed written report documenting findings, work performed, and recommended follow-up actions — supporting warranty claims, LL97 audits, and capital planning decisions.
The Cost of Reactive Maintenance Is Always Higher
Most HVAC failures don't happen suddenly. They happen after months of small warning signs that go unchecked — a worn belt, a clogged coil, a capacitor drawing too much current. By the time the system fails on a 95° August afternoon, the damage is done.
Denair's preventive maintenance programs are built to interrupt that pattern. We work with facility managers across all five boroughs to establish maintenance cadences that match your systems, your occupancy, and your compliance obligations.
Start a Maintenance PlanAverage energy cost reduction when maintenance is paired with controls upgrades
Higher cost of emergency repair vs. scheduled preventive maintenance
Potential equipment lifespan extension with consistent preventive care
Your Maintenance Plan Should Support LL97 Compliance — Not Ignore It
Local Law 97 caps carbon emissions for NYC buildings over 25,000 sq. ft., with escalating penalties from 2024 through 2030 and beyond. An inefficient, poorly maintained HVAC system is one of the biggest contributors to excess emissions — and one of the most addressable.
Denair's maintenance agreements include efficiency reporting aligned to LL97 benchmarking requirements. We can pair your maintenance plan with a no-cost LL97 assessment to identify your compliance gap and develop a remediation roadmap.
Request a Free LL97 AssessmentA Maintenance Partnership Built Around Your Operations
We don't drop in on a generic schedule. Our process starts with understanding your facility and ends with a plan that works for your building, your tenants, and your budget.
Facility Assessment
We conduct a full audit of your existing HVAC systems — equipment type, age, condition, and service history. This informs the right maintenance frequency and scope for your specific building.
Custom Maintenance Plan
We build a maintenance agreement that specifies visit frequency, scope per visit, priority systems, and emergency response protocols. No boilerplate — every plan reflects your building's needs.
Scheduled Service Visits
Visits are coordinated around your building's operational hours to minimize disruption. Our factory-trained technicians arrive prepared with the correct equipment and parts for your systems.
Reporting & Follow-Through
You receive a written service report after every visit. Findings are tracked across service cycles so we can identify trends, prioritize capital repairs, and demonstrate performance improvements over time.
24/7 Emergency Backup
Maintenance contract clients receive priority dispatch for emergency repairs. If something fails between visits, Denair responds — day, night, weekends, all five boroughs.
We Service What You Have. Whatever Brand It Is.
Denair's technicians are factory-certified across the full range of commercial HVAC equipment found in NYC buildings — so your maintenance plan is backed by manufacturer-level expertise.
- AAON
- Trane
- Carrier
- Daikin
- LG
- Mitsubishi
- Fujitsu
- Samsung
- 75F
- Honeywell
- Stulz
- Liebert
- ABB
- Yaskawa
Preventive Maintenance Across All Five Boroughs
Denair HVAC serves commercial buildings throughout New York City. Our service teams are dispatched from Brooklyn and cover every borough on a scheduled and emergency basis.
Brooklyn
Commercial HVAC preventive maintenance for office, retail, industrial, and mixed-use buildings throughout Brooklyn. Based in Brooklyn — your local partner.
Manhattan
Serving Class A, B, and C office buildings, healthcare facilities, hotels, and retail throughout all Manhattan neighborhoods. After-hours scheduling available.
Queens
Preventive maintenance contracts for industrial parks, mixed-use developments, and commercial properties throughout Queens — including LIC, Flushing, and Jamaica.
The Bronx
Full-service HVAC maintenance for commercial, industrial, and institutional buildings across the Bronx. Responsive scheduling with 24/7 emergency backup.
Staten Island
Preventive maintenance agreements for commercial and light industrial facilities throughout Staten Island, with the same service standards across all NYC boroughs.
What Facility Managers Ask About Preventive Maintenance
Most commercial HVAC systems require a minimum of two preventive maintenance visits per year — typically in spring and fall. High-use facilities, buildings with LL97 compliance obligations, or systems running computer room cooling may require quarterly visits. Denair customizes visit frequency based on your equipment type, building occupancy, and service history.
Yes. A well-maintained HVAC system operates more efficiently, which directly reduces your building's carbon emissions — a key factor in LL97 compliance. Denair's maintenance plans include efficiency reporting and can be paired with an LL97 assessment to identify where upgrades or controls improvements will have the most impact on your compliance position.
Each visit includes a full system inspection, filter replacements, coil cleaning, belt and bearing checks, refrigerant level verification, controls calibration, and a written service report. For buildings on BMS/BAS platforms, we also verify setpoints and scheduling to ensure the system is operating to its programmed parameters.
Absolutely. Dirty coils, worn belts, and miscalibrated controls force your HVAC system to work harder than necessary. Denair's maintenance programs have helped commercial clients achieve an average 30% reduction in energy costs when combined with our automation and controls upgrades.
Yes. Denair HVAC provides customized preventive maintenance agreements for commercial buildings in Brooklyn, Manhattan, Queens, the Bronx, and Staten Island. Our service contracts are tailored to your system type, building size, and operational requirements — with 24/7 emergency response included for all contract clients.
Ready to Stop Reacting and Start Protecting?
Let's build a maintenance plan that fits your building, your systems, and your LL97 obligations. A Denair HVAC specialist will review your current equipment and propose a customized program — at no cost to you.
Serving Brooklyn · Manhattan · Queens · The Bronx · Staten Island
DenairHVAC.com
Let's Talk About
Your Building.
Whether you're navigating LL97 compliance, planning a capital improvement project, or dealing with a system that can't wait — our team is ready to respond.
- 24/7 emergency response across all five NYC boroughs
- LL97 compliance expertise built into every engagement
- 10+ years partnering with NYC facility managers
- Proven 30% average reduction in energy costs