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Mechanical / HVACaka: outdoor unitaka: condenser unitaka: AC condenser

Condensing Unit

In Plain English

The outdoor unit of an air conditioning system that releases heat to the outside air.

Definition

The outdoor portion of a split-system air conditioner or heat pump that contains the compressor, condenser coil, and condenser fan. The condensing unit rejects heat absorbed from the building interior to the outdoor air. It is connected to the indoor evaporator coil or air handler by refrigerant piping.

Why It Matters in Bidding

On an HVAC bid the condensing unit is a major tagged-equipment cost that the estimator prices from the mechanical schedule and a vendor quote, not from generic pricing. Lead times, refrigerant line set runs, electrical disconnect and circuit coordination, and pad or roof curb requirements all carry related costs across trades, so missing one of these on the takeoff creates scope gaps between the mechanical and electrical bids.

Example

Reading the mechanical equipment schedule, an estimator pulls the specified tonnage and SEER rating for each condensing unit, gets a manufacturer quote with lead time, then adds line set, disconnect, and concrete pad costs and coordinates the circuit with the electrical estimator.

Related Terms

CompressorSplit SystemRefrigerantEvaporator

Frequently Asked Questions

Beyond the unit itself, estimators include refrigerant line sets, a mounting pad or roof curb, electrical disconnect and circuit, startup and commissioning, crane or rigging for placement, and any required isolation or sound attenuation. These related items are easy to miss and should be confirmed against the spec and equipment schedule.
They identify each unit's tonnage, efficiency rating, and accessories from the mechanical schedule, then request manufacturer or distributor quotes rather than relying on unit-cost databases. Capturing the lead time matters because long-lead equipment affects the schedule and may require early release and a deposit reflected in the bid and cash-flow plan.
Each unit needs a properly sized circuit and disconnect, and ambiguity over who furnishes and installs them creates scope gaps between mechanical and electrical bids. Estimators confirm the division of responsibility during bid coordination so the disconnect, whip, and circuit are carried by exactly one trade, not double-counted or omitted.

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