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Mechanical / HVACaka: packaged rooftop unitaka: package unitaka: self-contained unit

Packaged Unit

In Plain English

An all-in-one HVAC unit containing both the heating and cooling equipment in one outdoor cabinet.

Definition

A self-contained HVAC unit in which all components—compressor, condenser, evaporator, air handler, controls, and optional heating—are housed in a single weatherproof cabinet. Packaged units are typically installed on rooftops or ground pads adjacent to the building. They are common in light commercial applications because they simplify installation and service access.

Why It Matters in Bidding

Packaged units simplify the mechanical scope into countable pieces of equipment, which makes them easy to take off but heavy on coordination cost. Estimators must price not just the unit but the roof curb, structural support, crane or rigging, electrical and gas connections, and controls. Whether the design uses packaged rooftop units versus split or built-up systems materially shifts both the equipment buyout and the cross-trade general conditions.

Example

On a retail buildout, the HVAC estimator carries six 5-ton packaged rooftop units plus their roof curbs, a crane day for setting, and the gas and electrical whip connections coordinated with the plumbing and electrical subs.

Related Terms

Rooftop UnitSplit SystemAir HandlerCompressor

Frequently Asked Questions

The equipment is only part of it. Estimators add the roof curb, structural reinforcement, crane and rigging to set the unit, vibration isolation, electrical disconnect and whip, gas piping if applicable, ductwork transitions, and controls integration. Omitting rigging or the curb is a frequent source of HVAC bid shortfalls.
A packaged unit houses all components in one outdoor cabinet, so the bid centers on setting and connecting one unit. A split system separates the condenser and indoor air handler, adding refrigerant line sets, indoor labor, and two mounting locations, which usually raises installation labor and coordination cost.
Rooftop units must be lifted into place, so the bid needs crane mobilization, a lift plan, and sometimes street or roof access logistics. On multistory or tight sites the crane day can rival the unit cost, and scheduling the lift around other trades affects general conditions, so estimators price it explicitly.

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