Air Handling Units · Greater Toronto Area

Commercial Air Handling Unit Service in the GTA

Central air-system support across fans, filters, coils, dampers, drainage and building controls.

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Commercial & industrial HVAC support across the Greater Toronto Area.

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Equipment overview

The connection point for air, water and controls

An air handling unit brings together filtration, fans, heating or cooling coils, dampers, drainage and controls before air enters the building distribution system. Its performance may depend on boilers, chillers, refrigeration equipment and the building automation system. Sensible looks at those interfaces when diagnosing airflow, temperature, moisture, noise or control complaints.

Where this equipment is used

Office towers and large commercial buildings
Schools, campuses and institutions
Hospitals and healthcare facilities
Industrial and multi-zone properties

Commercial air handling unit in a mechanical room

Signs you need air handling unit repair

Airflow dropping off, or pressure drop climbing across the filters
Fan noise, belt wear, bearing wear or vibration
Visible leakage at coils, valves or drain pans
Drain pans or traps holding water between visits
Dampers or actuators not following the control sequence
Sensors reporting values the space conditions do not support

Signs you need air handling unit replacement

Airflow and static pressure that no longer meet how the space is occupied
Coil or casing condition that repair no longer holds
Repairs recurring on the same components across seasons
Distribution or plant interfaces that limit what repair can achieve
Access and phasing constraints that make in-place work impractical
A building change that leaves the unit mismatched to the load

Signs you need air handling unit preventative maintenance

Filter condition and air-path cleanliness left until airflow complaints arrive
Fans, belts, bearings and motors with no scheduled inspection
Coils, drain pans and traps not checked for moisture concerns
Damper, actuator and control response never tested
No pre-season inspection ahead of heating and cooling
Findings recorded without being carried into planned work

Schedule Service

How often should an air handler be serviced?

ANSI/ASHRAE/ACCA Standard 180 prescribes inspection and maintenance tasks at defined frequencies for commercial air handlers and the records that should support them. Most buildings schedule around the seasons, with the interval set by filter loading, run hours and how critical the space is.

Why is airflow dropping when the filters were changed recently?

Filters are the usual suspect but not the only one. Belt or bearing wear, a fouled coil, a damper that is not opening fully, or a control sequence holding the fan at part speed all reduce delivered air. Pressure drop readings across the unit usually separate them quickly.

What causes water in the drain pan between visits?

Normally a blocked drain, a trap that has lost its seal, or condensate carrying over from a coil at higher-than-design airflow. It is worth resolving promptly because standing water in an air path becomes an air-quality problem as well as a maintenance one.

Can an air handler be modernised rather than replaced?

Often. Coils, fans, drives, sensors and controls can frequently be renewed within the existing casing where the structure and access allow. Whether that is the better spend depends on current airflow needs, the plant interfaces, and what shutdown the building can tolerate.

What has to be verified after AHU work?

Airflow and static pressure against what the space needs, damper and actuator response, sensor readings, and the control sequences that tie the unit to the rest of the plant. Functional verification is part of the work rather than a separate exercise.