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Commercial Air Handling Unit Preventive Maintenance
Scheduled AHU service that keeps tenant spaces conditioned and your equipment off the failure list. Belt, bearing, coil, damper, and drain pan maintenance for built-up and packaged air handlers across the NYC metro.
Common AHU Problems We Catch and Prevent
Weak airflow and tenant comfort complaints
Loose or glazed fan belts slip under load, clogged filters spike static pressure, and fouled coils choke airflow. Each one drops CFM to the zones, leaving conference rooms and perimeter offices unconditioned. Scheduled belt tensioning, filter changes, and coil cleaning restore design airflow.
Water staining or ceiling leaks below the unit
A clogged condensate drain pan or failed P-trap lets water back up and overflow onto the deck, damaging ceilings and finishes on the floor below. Routine pan cleaning, drain flushing, and biocide treatment keep condensate moving to drain.
Bearing noise, grinding, or fan vibration
Dry or worn fan and motor bearings produce a rising whine or grinding that ends in a seized shaft and an unplanned shutdown. Periodic lubrication, vibration checks, and early bearing replacement prevent a total fan failure during occupied hours.
Rooms too humid or windows fogging
When dampers stick, coils foul, or the unit short-cycles, the AHU stops pulling moisture out of the air. Indoor humidity climbs, glass fogs, and the building feels clammy. Damper calibration and coil cleaning restore proper latent capacity and dehumidification.
Energy bills climbing without a usage change
A stuck economizer damper, dirty coils, or a slipping belt force the unit to run longer to hit setpoint. Fan motors draw more amps and run-hours rise. Damper and actuator service plus clean coils bring kW back in line and support Local Law 97 performance.
Musty odor in supply air
Standing water in the drain pan and biofilm on coils and insulation breed microbial growth that the airstream carries to occupied spaces. Coil cleaning, pan sanitizing, and drain treatment eliminate the source and improve indoor air quality.
Why AHU Preventive Maintenance Protects Your Building
Air handling units are the workhorses of a commercial building's HVAC system, moving conditioned air through ductwork to every occupied floor. When an AHU drifts out of spec, the symptoms land on tenants first: hot and cold complaints, stuffy conference rooms, humidity that fogs glass, and energy bills that creep upward. Most AHU failures are not sudden. Belts glaze and slip, bearings dry out and seize, coils foul with dust and biofilm, and condensate drains clog until the pan overflows into the ceiling below. Preventive maintenance catches every one of those failure paths on a schedule instead of during a tenant emergency. Com+ Mechanical services built-up, modular, and packaged air handlers across the five boroughs, Nassau, Westchester, northern New Jersey, and Stamford. Our PM program is built around the real wear points of commercial AHUs, with technicians who read static pressure, motor amp draw, and approach temperatures, not just swap a filter. The result is steady supply-air temperatures, fewer reactive service calls, and equipment that reaches its full service life instead of being replaced early.
What Every AHU Maintenance Visit Includes
What a PM Program Delivers for Your Facility
Our Simple Process
From call to comfort in 4 easy steps
Survey and Equipment Inventory
We walk every mechanical room and rooftop to inventory each air handler: make, model, fan and motor type, coil configuration, filter sizes, and damper and control setup. We note access constraints, tenant-occupancy hours, and existing problem areas across the portfolio.
Custom PM Scope and Schedule
We build a maintenance scope and frequency matched to each unit's duty and condition, then set visit intervals around your building's occupancy so service happens with minimal disruption to tenants.
Scheduled Service Visits
Our technicians perform the full task list at each visit, capturing baseline readings such as static pressure, motor amps, and approach temperatures, and flagging any developing issue before it becomes a failure.
Reporting and Recommendations
After each visit you receive a documented report with completed tasks, measured data, and prioritized recommendations for repairs or upgrades, giving you the information to plan budgets and capital projects with confidence.
Types of Systems We Install
Built-Up and Modular Air Handlers
Large, field-assembled or sectional AHUs serving multiple floors or zones, typically located in mechanical rooms or penthouses, with separate fan, coil, filter, and mixing-box sections.
- •Section-by-section service of fan, coil, filter, and damper modules
- •Supply and return fan belt, bearing, and VFD maintenance
- •Multi-coil cleaning with air-side pressure-drop verification
- •Mixing-box and economizer damper calibration
Packaged and Rooftop Air Handlers
Self-contained units, often roof-mounted, that house the fan, coils, and filters in a single weatherized cabinet serving one or more zones.
- •Weatherized cabinet, gasket, and curb inspection for water intrusion
- •Single-cabinet coil cleaning and condensate drain service
- •Belt-drive and direct-drive fan maintenance
- •Economizer and outdoor-air damper testing
Make-Up Air and Dedicated Outdoor Air Units
Units that condition 100% outdoor air for ventilation, kitchens, labs, and pressurization, with heavy filtration and tempering coils that demand close attention.
- •High-volume filter management and tracking
- •Heating and cooling coil cleaning and freeze-protection checks
- •Outdoor-air damper and actuator service
- •Airflow and tempering verification for ventilation compliance
Why NYC Facilities Teams Choose Com+ Mechanical
Commercial AHUs Are Our Focus
We service built-up, modular, and packaged air handlers in office towers, healthcare, education, and multi-tenant buildings, not residential equipment. Our technicians know the failure modes of large commercial fan systems.
Portfolio-Ready Coverage
From a single building to a portfolio across the five boroughs, Nassau, Westchester, northern New Jersey, and Stamford, we coordinate one maintenance program with consistent reporting across every site.
Diagnostics, Not Just Filter Swaps
Every visit captures real data: static pressure, amp draw, approach temperatures, and VFD parameters. We trend the readings so small drifts get corrected before they cost you uptime or energy.
24/7 Emergency Backup
When something does fail off-hours, the same team that knows your equipment responds around the clock, so there's no ramp-up time explaining your system to a stranger.
Transparent Pricing
No fees. No surprises. Just honest service.
Preventive Maintenance Program
Scheduled, comprehensive AHU service on a frequency matched to each unit's duty and your occupancy.
- Full task list every visit: belts, bearings, coils, drains, filters, dampers
- Motor, VFD, and safety testing with logged readings
- Visit intervals scheduled around tenant occupancy
- Documented reports and trend data after every visit
- Priority scheduling for follow-up repairs
Portfolio Maintenance Agreement
An ongoing agreement covering AHUs across multiple buildings with unified scheduling and reporting.
- One maintenance program across all sites
- Consolidated reporting and capital-planning data
- Priority response and preferred repair rates
- Annual scope review and budget forecasting
- Single point of contact for the portfolio
Final pricing is confirmed after an on-site survey of your air handlers, their condition, access, and required service frequency.
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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Frequently Asked Questions
Get answers to common questions about our services
How often should commercial air handling units be serviced?
Most commercial AHUs benefit from quarterly preventive maintenance, with filter changes and coil checks sometimes more frequent depending on the unit's duty, filtration level, and the building's environment. Units serving healthcare, labs, or high-occupancy spaces often need tighter intervals. We set the schedule for each unit after surveying its condition and your occupancy patterns.
Can you maintain air handlers across multiple buildings in our portfolio?
Yes. We run AHU maintenance programs for single buildings and for portfolios spanning the five boroughs, Nassau, Westchester, northern New Jersey, and Stamford. You get one coordinated program, consistent reporting across every site, and a single point of contact rather than juggling multiple vendors.
Do you offer emergency service if an AHU fails outside the maintenance schedule?
Yes, we provide 24/7 emergency response. Because the same team maintains your equipment, our technicians already know your air handlers and configuration, which shortens diagnosis and repair time when a fan, motor, or drain fails during occupied hours.
How does AHU maintenance help with Local Law 97 and energy performance?
Air handlers are major energy consumers in commercial buildings. Dirty coils, slipping belts, and stuck economizer dampers force fans to run longer and draw more power. Keeping coils clean, belts tensioned, and dampers calibrated reduces fan run-hours and kW draw, which lowers emissions intensity and supports Local Law 97 compliance. Our visit reports document the performance data you need for benchmarking.
Will maintenance disrupt our tenants or require shutdowns?
We schedule service around your building's occupancy to minimize impact. Most PM tasks are performed during normal run conditions or short, planned windows. For work that requires a unit to be down, we coordinate timing with your facilities team and can perform it after hours to avoid affecting tenants.
What documentation do we receive after each visit?
After every visit you receive a report listing the tasks completed, measured readings such as static pressure and motor amp draw, the condition of key components, and prioritized recommendations for any repairs or upgrades. Over time this builds a trend record that supports capital planning, compliance, and budgeting.
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Get Your Air Handlers on a Maintenance Schedule
Stop running your air handlers to failure. A preventive maintenance program from Com+ Mechanical keeps tenant spaces comfortable, controls energy spend, and gives your facilities team the documentation to plan ahead. Contact us to schedule an on-site AHU survey and receive a custom maintenance proposal for your building or portfolio.
Schedule Your AHU Survey