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Commercial HVAC in Nassau County, Long Island
Rooftop units, chillers, controls and 24/7 service for office parks, retail centers and light-industrial buildings across Nassau — from the Mitchel Field office-park corridor to Garden City, Uniondale, Westbury and the South Shore.
HVAC Challenges Common to Nassau County Commercial Buildings
Aging rooftop fleets running well past their service life
Many Nassau office parks and retail centers still run the original packaged RTUs from when they were built — frequently 15-to-25-year-old gas/electric units. They limp through Long Island's humid summers with failing compressors, weak heat exchangers and worn economizers, and replacements are capital decisions, not quick fixes. We assess remaining life unit-by-unit so you can phase changeouts into a budget.
Roof access, crane and curb logistics on RTU changeouts
On a roof-heavy, low-rise building, replacing a rooftop unit is a coordination problem as much as a mechanical one: crane or boom-lift staging in an active parking field, curb adapters to mate a new unit to an old opening, and tenant notice so business isn't disrupted. Poorly planned, a single RTU swap shuts down a storefront for a day. We plan the lift, the curb and the schedule up front.
Multi-tenant retail comfort complaints and zoning disputes
In strip centers and big-box plazas, one tenant runs hot while the next runs cold, rooftop units are mismatched to current tenant loads after years of fit-outs, and it's never clear whether the landlord or the tenant owns the unit. We sort out the base-building-versus-tenant responsibility split your leases define and right-size zoning and controls so comfort complaints stop landing on the property manager.
Humidity, salt air and coastal corrosion on the South Shore
Long Island's marine climate is hard on rooftop equipment — high summer dew points overload undersized or dirty cooling coils, and salt-laden air near the South Shore corrodes cabinets, coils and condenser fins faster than inland sites. We address coil cleaning, corrosion protection and proper dehumidification so occupied space stays comfortable and equipment lasts.
No documentation for ownership, lenders or capital planning
Scattered invoices from whoever was available that week don't give asset managers, lenders or insurers the service history they expect, and they don't tell you which units are about to fail. We keep a tagged asset list and documented condition reports so equipment lifecycle and capital needs are defensible to ownership.
Reactive, break-fix service with no preventive plan
Without scheduled maintenance, the first sign of trouble is a no-cool call during a July heat advisory or a no-heat call on the coldest morning of the year — exactly when every contractor on the Island is slammed. Clogged coils, slipping belts, low charge and drifting controls are cheap to catch on a PM visit and expensive to ignore.
Commercial HVAC Built for Nassau County's Building Stock
Nassau County is a low-rise, suburban commercial market, and its HVAC needs reflect that. Instead of central-plant high-rises, most of the county's office parks, strip and big-box retail, medical office buildings and light-industrial flex space are conditioned by packaged rooftop units (RTUs) — often a dozen or more on a single roof, frequently aging gas/electric or heat-pump packages installed decades ago and run hard. Com+ Mechanical serves the buildings that define Nassau's commercial corridors: the the Mitchel Field area office parks straddling the Nassau–Suffolk line around Mineola, the Class A office cluster near Mitchel Field and Hofstra in Uniondale, the office and major retail of Garden City, the corporate buildings around Lake Success and Great Neck, and the shopping centers, warehouses and flex space in Westbury, Hicksville, Farmingdale, Bethpage and New Hyde Park. We service what these properties actually run — packaged RTUs and split systems, smaller air- and water-cooled chillers and VRF/VRV systems in larger offices and medical buildings, gas-fired heat and makeup air, plus the exhaust and ventilation tenants depend on. We work the way Long Island property managers, building owners and facilities teams operate: roof-heavy fleets where access and crane/lift logistics matter, multi-tenant retail where one storefront's comfort complaint is a lease problem, and OpEx and capital budgets that need to be planned, not surprised. As a single accountable vendor, we keep your equipment running, document what we find, and help you forecast replacements across one building or a whole Nassau portfolio.
Commercial HVAC Services in Nassau County
Why Nassau County Property Teams Work With Com+
Our Simple Process
From call to comfort in 4 easy steps
Site assessment and rooftop survey
We walk the roof and mechanical spaces, inventory every unit, and tag your assets — make, model, age, condition and remaining service life — so you start with a clear picture of the fleet instead of a stack of mismatched invoices.
Scope, priorities and a written plan
We flag what needs immediate attention versus what to budget, lay out a preventive schedule sized to your equipment, and define covered-versus-excluded scope and the base-building-versus-tenant split in writing — all priced as a Custom Quote before any work begins.
Coordinated execution
We schedule around tenants and business hours, handle COIs, roof access and crane or lift logistics for changeouts, and keep the property manager informed so RTU swaps and repairs don't disrupt occupants.
Documented reporting and ongoing coverage
After every visit you get condition reports with photos and logged readings, and on a recurring basis a portfolio review with lifecycle forecasts and budget guidance — so you can plan capital and defend decisions to ownership.
Types of Systems We Install
Packaged Rooftop Units (RTUs)
The dominant system across Nassau's office parks, retail centers and light-industrial buildings — self-contained gas/electric or heat-pump packages mounted on the roof, often many units per building and frequently aging. We install, replace, change out and maintain them, including curb adapters and crane/lift coordination.
- •Gas/electric and heat-pump packaged units
- •Curb-adapter changeouts onto existing roof openings
- •Economizer, compressor, heat-exchanger and control repair
- •Crane/boom-lift staging and tenant-notice planning
- •Coil cleaning and corrosion protection for the marine climate
Chillers, VRF & Split Systems
Larger Nassau offices, Class A buildings and medical office buildings often run air- or water-cooled chillers, cooling towers, VRF/VRV multi-zone systems, or banks of split systems. We service, repair and maintain these alongside the rooftop fleet so the whole building is covered by one vendor.
- •Air- and water-cooled chillers, cooling towers and pumps
- •VRF/VRV multi-zone systems for offices, suites and fit-outs
- •Ductless and ducted split systems
- •Hydronic and chilled-water distribution, VAV and fan-coil
- •Refrigerant management and leak repair
Why Com+ Mechanical in Nassau County
We know Nassau's commercial corridors
Office parks on the Mitchel Field office-park corridor, Class A space near Mitchel Field and Uniondale, Garden City retail and offices, the Lake Success and Great Neck corporate cluster, and the warehouses and flex space in Westbury, Hicksville, Farmingdale and Bethpage. We service the rooftop-driven systems these suburban, low-rise buildings actually run.
Single-vendor portfolio support
One relationship and one point of contact for routine PM, repairs, planned changeouts and emergencies — across a single Nassau building or a portfolio spanning the county and the wider metro. Mission-critical sites can carry richer coverage and lower-risk sites a lighter plan under one agreement.
Built for property-team workflows
We coordinate COIs, roof and mechanical-room access, and tenant notice, and we frame reporting around OpEx predictability and capital forecasting — the way Long Island asset managers, owners and facilities teams need to plan and answer to ownership.
Responsive local service, 24/7
HVAC failures don't wait for business hours. We provide around-the-clock emergency commercial response across Nassau and the NYC metro, with maintenance-agreement holders dispatched ahead of non-contract calls.
Transparent Pricing
No fees. No surprises. Just honest service.
Service & Repair
On-demand diagnosis and repair for rooftop units, chillers, boilers, controls and ventilation — billed per visit when you need a fix without an ongoing agreement.
- Troubleshooting and repair of RTUs, splits, chillers, boilers and controls
- Rooftop economizer, compressor, belt, charge and control faults
- Parts sourcing and changeout coordination, including curb adapters
- Findings documented after the visit
Preventive Maintenance Agreement
Scheduled, documented maintenance sized to your Nassau building or portfolio — the most cost-effective way to keep a rooftop-heavy fleet running and avoid peak-season failures.
- Tagged asset list and recurring inspections sized to your equipment
- Filter, belt, coil-cleaning and seasonal changeover program
- Priority scheduling and agreement-holder emergency dispatch
- Condition reports with lifecycle and capital-planning guidance
- Single point of contact across one building or a portfolio
24/7 Emergency
Around-the-clock emergency commercial response across Nassau County and the NYC metro for no-cool, no-heat and critical equipment failures.
- 24/7 dispatch across Nassau and the wider metro
- Agreement holders prioritized ahead of non-contract calls
- Rapid triage to restore comfort and protect occupied space
- Temporary measures and follow-up repair scoping as needed
Engagement models shown are structures, not quotes — all pricing is a Custom Quote. Final pricing is confirmed in writing after a site assessment, since cost depends on the number, type, age and roof access of your units, visit frequency, the coverage level selected, and the covered-versus-excluded scope (including refrigerant, controls and any central-plant components) defined per agreement before signing.
Own a Commercial Property?
Business+ plans start at $499/year — includes 2 rtu tune-ups, 10% off all services, and priority scheduling.
Equipment & Brands We Service
Factory-trained technicians for all major HVAC manufacturers
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Proudly Serving Nassau County
Fast, reliable service in your neighborhood
Frequently Asked Questions
Get answers to common questions about our services
What parts of Nassau County do you cover, and how fast can you respond?
We serve commercial buildings across Nassau — the Mitchel Field office-park corridor, Garden City, Uniondale and Mitchel Field, Lake Success and Great Neck, and Westbury, Hicksville, Farmingdale, Bethpage, New Hyde Park and the South Shore — as part of our wider NYC metro coverage, with 24/7 emergency dispatch. Maintenance-agreement holders are prioritized ahead of non-contract calls.
Can you handle multiple buildings or a Nassau-wide portfolio under one contract?
Yes. Consolidating a mixed portfolio onto one vendor is exactly what we're built for. We put every building's equipment on a single tagged asset list under one master relationship, with consistent per-building reporting, coordinated scheduling and one point of contact across Nassau and the metro. Mission-critical buildings can carry richer coverage while lower-risk sites run a lighter plan, all under the same agreement.
Most of our buildings are conditioned by rooftop units — is that your focus?
It's a core part of what we do. Nassau's office parks, retail centers and light-industrial buildings are predominantly served by packaged rooftop units, and we install, replace, repair and change out RTUs — including curb adapters and the crane or lift logistics a roof-heavy, low-rise building requires. We also service the splits, smaller chillers, VRF systems and gas heat found in larger Nassau offices and medical buildings.
Do you provide emergency service after hours and on weekends?
Yes. HVAC failures don't wait for business hours, so we provide 24/7 emergency commercial response across Nassau and the NYC metro, with agreement holders dispatched first. Preventive coverage also reduces how often you need emergency service by catching faults — low charge, failing compressors, slipping belts, clogged coils — before they fail during a heat advisory or a deep freeze.
Does Local Law 97 apply to my Nassau County building?
Generally no — NYC Local Law 97 applies to buildings within New York City's five boroughs, not Nassau County, so most Nassau properties are outside its scope. That said, energy cost and efficiency still drive your OpEx, and New York State and utility programs (such as NYSERDA incentives) can apply to commercial efficiency upgrades on Long Island. We keep equipment running at rated efficiency and can frame retrofits around energy savings. If you also operate buildings inside NYC, we support Local Law 97 compliance on those properties.
How do you price service in Nassau, and will you commit to a written scope?
All pricing is a Custom Quote confirmed in writing after we assess your equipment, roof access and coverage needs — we don't quote HVAC sight-unseen. We define covered-versus-excluded scope and the base-building-versus-tenant responsibility split before any agreement is signed, so there are no surprises about what's included.
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Get a Commercial HVAC Partner Who Knows Nassau County
Whether you manage a single retail plaza in Garden City, an office park on the Mitchel Field office-park corridor, or a portfolio of buildings across Nassau and the metro, Com+ Mechanical keeps your rooftop units, chillers and controls running — with documented reporting, planned capital guidance and 24/7 emergency response. Call (332) 600-4640 to schedule a site assessment.
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