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Mechanical / HVACaka: AHUaka: air handling unit

Air Handler

In Plain English

The indoor unit in an HVAC system that heats, cools, and moves air through the building's ducts.

Definition

A unit that conditions and circulates air as part of a heating, ventilating, and air-conditioning system. Air handlers contain a blower, heating or cooling coils, filters, and often humidification or dehumidification components. They are typically connected to a ductwork distribution system that delivers conditioned air throughout a building.

Why It Matters in Bidding

The air handler is frequently the single most expensive piece of equipment in a mechanical bid, so its selection, capacity, and accessories must align exactly with the schedule and specs to avoid an under- or over-priced number. Long lead times on air handlers also affect bid-stage scheduling and cash flow, making early vendor quotes critical to a competitive and buildable mechanical proposal.

Example

Pricing a tenant fit-out, the mechanical estimator pulls the air-handler schedule, matches each unit's CFM and coil capacity to a manufacturer quote, and flags an eight-week lead time so the GC can sequence the rough-in.

Related Terms

DuctworkCoilFan Coil UnitHVAC

Frequently Asked Questions

Capacity in CFM and tonnage, coil type, blower horsepower, filtration level, and accessories like economizers or humidifiers all drive price. Custom or built-up units cost far more than packaged ones. Estimators price from the equipment schedule and a vendor quote, then add rigging, setting, and connection labor to the ductwork and piping.
Air handlers are often long-lead equipment, so a quote must capture both price and delivery. A unit that arrives late can stall mechanical rough-in and delay the whole project. Estimators note lead times in the proposal so the GC can plan procurement, release purchase orders early, and protect the construction schedule.
The mechanical sub typically furnishes and sets the air handler and connects ductwork, refrigerant, and condensate. Electrical handles power wiring and disconnects, and controls may be a separate line item. Clarifying these scope splits during bidding prevents gaps or double-counting between the mechanical, electrical, and controls subcontractors.

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