AHU & FCU Servicing in Dubai
Servicing and maintenance for air handling units (AHUs), fresh air handling units (FAHUs) and fan coil units (FCUs) in Dubai commercial buildings, hotels, clinics and chilled-water apartments. Coil deep cleans, heat-recovery service, filters, fans, drains and dampers. Fixed-price written quote, 6-month workmanship warranty.
What we cover
Full AHU and FCU scope from a single visit. Most building MEP teams under-service these units because the impact is invisible until it costs real money — we tune cadence to the building, not a checklist.
AHU coil deep clean
Chemical and mechanical clean of cooling and (where present) heating coils. A fouled AHU coil drops cooling capacity 15 to 25% and pushes load back onto the chiller plant. related page.
Fan, motor & bearings
Fan and motor inspection, bearing service, belt replacement and re-tension. Vibration check and alignment to extend motor life.
Drain pan & condensate
Drain pan flush and anti-bacterial treatment, condensate line clearing. The single most common source of ceiling leaks in commercial buildings.
Filter replacement
Panel, bag and HEPA filters changed on schedule. Pressure differential across the filter bank verified after the change.
Damper actuator service
Damper actuators serviced, calibrated and re-stroked. Control valve service alongside, so the BMS reads true.
FCU service rotation
Coil cleaning, filter clean or replacement, motor and fan inspection, drain pan flush, thermostat calibration. Refrigerant pressure check on direct-expansion FCUs.
Pressure differential verification
Static pressure across the unit measured against design. Trends flagged in the report so the building owner sees efficiency drift over time.
Hotel & clinic-friendly scheduling
Per-room FCU programmes for hotel guest rooms; infection-control coordination for clinic FCUs. We work to your occupancy schedule.
FAHU maintenance: keeping fresh air dry and clean
A fresh air handling unit (FAHU) takes in 100% outside air, filters it, cools it and dries it before it reaches the AHUs, FCUs or rooms it serves. In most Dubai towers, hotels and clinics it carries the building's humidity load, so a neglected FAHU shows up as damp, musty rooms first.
Why FAHUs work hardest in Dubai
Dubai's average dew point in July and August sits around 23°C and reaches the high 20s on humid days. To dry that air, the coil has to cool it below its dew point, and the fresh-air coil does most of the work. DHA's facility guidelines say FCUs should not be used to dehumidify Dubai's outdoor air. It should arrive already dried by a dedicated fresh-air unit with energy recovery.
Heat-recovery wheels and plates
Al Sa'fat requires energy recovery on new buildings that bring in more than 1,000 L/s of treated outdoor air. On most newer FAHUs, that makes the recovery section part of the service.
- Thermal wheels: we clean the media, check the drive belt and motor, and set the seals and purge sector so exhaust air doesn't leak into the supply.
- Plate exchangers: we clean the plates, clear the exhaust-side drain and check the bypass damper.
- Heat pipes and run-around coils: we clean the coils and check the circuit and pump.
Coils and filter stages
Many FAHUs have a pre-cooling coil and a deeper dehumidifying coil. We clean both, check the chilled-water valve strokes fully, and measure off-coil temperature against design. Air leaving the coil too warm means wet air in the building, however cold the FCUs run.
Dusty outside air needs at least two filter stages: a coarse pre-filter, then a finer bag or panel filter. For health facilities, DHA guidance sets a minimum of MERV 8 for the first stage and MERV 14 for the final stage after the wet coils. We change filters when the measured pressure drop says so, not by the calendar.
Typical FAHU faults
| Symptom | Usual cause |
|---|---|
| Humid or musty rooms, condensation on diffusers | Fouled dehumidifying coil, chilled-water valve not opening fully |
| Doors whistling, corridor smells drawn into flats | Weak fresh-air fan or blocked filters, leaving the building under negative pressure |
| Water in the plenum or the ceiling below | Blocked drain, dry trap, or water carried off a wet coil |
| Wheel stopped, or supply air smelling of exhaust | Broken belt, failed drive motor, worn seals or purge sector |
AHU cooling-coil (evaporator) deep clean
On a chilled-water AHU the cooling coil is a water coil. On a DX AHU it is the refrigerant evaporator. Either way it fouls fastest, because it is wet and catches whatever the filters miss. Our deep clean runs in six steps:
- Measure pressure drop across the coil and on-coil and off-coil temperatures, plus suction pressure and superheat on DX units.
- Isolate the unit and protect the fan section and electrics.
- Comb damaged fins so the cleaner reaches the full depth of the coil.
- Apply a coil-safe cleaner, then rinse at low pressure from the leaving-air side, pushing dirt out the way it came in.
- Flush and disinfect the drain pan, and clear the trap and condensate line.
- Re-measure, and log the before-and-after figures with photos.
Most AHU coils need this once or twice a year. Units behind poor filters or running 24 hours need it more often.
FCU maintenance in apartments on chilled water and district cooling
Most Dubai towers on Empower, Emicool or Tabreed cool each apartment with chilled-water FCUs above the ceiling. The provider runs its plant and the energy transfer station (ETS), and the building owner maintains everything on the building side. Inside the apartment, the tenancy contract usually decides who pays for FCU servicing.
An apartment FCU service covers:
- the filter and the return-air path
- a coil clean, and a drain pan flush and treatment
- the condensate line, cleared to the riser
- a fan and motor check
- the chilled-water valve and actuator, stroked from a calibrated thermostat
- the valves and flexible connections, checked for weeping.
Two complaints cover most FCU call-outs. A unit that blows but doesn't cool usually has a stuck actuator, a blocked strainer or air in the coil. Water through the ceiling is almost always the drain. For new or replacement units see FCU installation. For a yearly plan that covers the whole apartment, see our apartment AMC.
How often should AHUs, FAHUs and FCUs be serviced?
These are the intervals we start from in Dubai. A dusty site or a 24-hour hotel will need them shortened.
| Task | AHU | FAHU | FCU |
|---|---|---|---|
| Filter check | Monthly | Monthly, more often in dusty months | Quarterly, monthly in hotels and clinics |
| Fan, belts and bearings | Quarterly | Quarterly | Each service |
| Drain pan and condensate | Quarterly | Monthly July to September, otherwise quarterly | Each service |
| Coil deep clean | Once or twice a year | Twice a year | Once a year |
| Heat-recovery wheel or plate | n/a | Checked quarterly, cleaned yearly | n/a |
| Full service with report | Quarterly | Quarterly | Once or twice a year |
Who we serve
AHU and FCU work across the building types where it matters most. We tune cadence to occupancy and load profile, not a generic schedule.
Single-occupancy offices
Building owners and head-tenants running their own AHU plant. Scheduled servicing tuned to the chilled-water side of the system.
Multi-tenant towers
FCU rotation programmes across floors and tenancies. Reporting to the building owner alongside per-tenant access coordination.
Hotel guest-room FCUs
Per-room servicing programmes scheduled around occupancy. Quiet working, room return in service condition, single-page report per room.
Clinic FCUs
Infection-control coordination with the facility lead. Filter changes and coil clean scheduled around clinical sessions. We currently work with clinic clients including Sakura Beauty, Caya and Barvikha.
Warehouse & industrial AHUs
Large unit AHUs serving warehouses and light industrial. Heavy-duty coil clean, belt and bearing programmes.
Standalone retail
Single-tenant retail spaces on chilled-water FCU. Service windows scheduled around trading hours.
How we price AHU & FCU work
Fixed-price written quote per unit or per rotation. Building-wide programmes priced on unit count and tonnage, not floor area.
Indicative ranges
- Single FCU servicing: AED 200–400
- Single AHU servicing (small, 5–15 TR): AED 800–2,500
- Single AHU servicing (medium, 15–50 TR): AED 2,500–6,500
- Single AHU servicing (large, 50+ TR): AED 6,500–18,000+
- Single FAHU servicing, including the heat-recovery section: priced on airflow or TR band
- Full-building FCU rotation (per unit, volume): AED 100–250
Programme & contract pricing
Building-wide programmes are quoted per AMC, with quarterly rotation, priority breakdown response and consolidated reporting. See Commercial AMC.
Workmanship and material warranties
Two layers of cover on every AHU and FCU engagement. The workmanship warranty is ours; manufacturer warranties on parts pass through to you directly.
Workmanship warranty
6-month workmanship warranty — if a service or repair item we performed fails within 6 months due to our work, we re-do the labour at no cost.
Warranty start date is recorded on the handover sheet for each unit, with photos before and after.
Material warranties
Manufacturer warranties on parts (motors, belts, bearings, actuators, filters, control valves) pass through directly. Ranges run from 1 to 10 years depending on the component. Exact terms documented on the written quote.
AHU, FAHU and FCU maintenance questions
What is the difference between an AHU and a FAHU?
An AHU conditions a mix of return air and some outside air for a zone or floor. A FAHU handles 100% outside air. It filters, cools and dehumidifies that air, often recovering energy from the exhaust, then feeds it to AHUs, FCUs or rooms. In Dubai the FAHU carries most of the humidity load.
How often should a FAHU be serviced in Dubai?
We service FAHUs quarterly, with monthly filter checks and a coil deep clean twice a year. From July to September the drain pan needs monthly attention, because that is when the coil pulls the most water out of the air. The heat-recovery wheel or plate is checked quarterly and cleaned yearly.
What does an FCU service include?
An FCU service covers the filter, coil, drain pan and condensate line, a fan and motor check, and a test that the chilled-water valve responds to the thermostat. On direct-expansion FCUs we also check refrigerant pressures. A single FCU service costs AED 200–400, and building-wide rotations are AED 100–250 per unit.
Why is my FCU running but not cooling?
On chilled-water FCUs the usual causes are a valve actuator stuck closed, a blocked strainer, air in the coil or a faulty thermostat. A dirty filter or coil can also cut airflow enough to feel like no cooling. If several flats on the same riser are warm, the fault is probably upstream: pumps, balancing or supply.
Who pays for FCU maintenance in a district-cooled apartment?
The district cooling provider maintains its own plant and the energy transfer station. The building owner is responsible for equipment on the building side. Inside an apartment, the tenancy contract usually says whether the landlord or the tenant pays for FCU servicing. Our guide to AC servicing for tenants in Dubai covers the common arrangements.
How much does AHU maintenance cost in Dubai?
A single AHU service costs AED 800–2,500 for small units (5–15 TR), AED 2,500–6,500 for medium units (15–50 TR) and AED 6,500–18,000+ for large units over 50 TR. Coil size, filter stages, access and condition set the price. Building-wide programmes are quoted per unit and tonnage under a commercial AMC.
Areas we cover
Same-day reach across Dubai. Tap your area for landmarks, communities and the services we deliver there — or tell us your building on WhatsApp.
Request an AHU / FCU survey
Send the building name, number of AHUs and FCUs, and any recent fault history on WhatsApp. We confirm survey timing and the audit fee before we visit.
