Chilled-Water AHU vs DX Operating-Cost Comparator

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Chilled-Water AHU vs DX Operating-Cost Comparator

Estimate the annual and 15-year running-cost gap between a chilled-water ceiling AHU and equivalent DX cassettes for your load.

Cooling load (kW)

Run hours / day

HRS

Operating days / year

DAYS

Electricity price ($/kWh)

USD

Assumed DX system COP (typical ~3.0)

COP

Chilled-water efficiency advantage: 25%

Industry sources typically cite 20–30% at scale.

DX cassettes — annual energy —

Chilled-Water Ceiling AHU — annual energy —

—

estimated 15-year energy saving

This is an illustrative energy-only estimate from your assumptions — it excludes the upstream chiller plant and maintenance.

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Illustrative model: DX annual kWh = load ÷ COP × hours × days; chilled-water cost = DX cost × (1 − efficiency advantage). The efficiency-advantage default reflects industry-reported 20–30% operating-cost savings for chilled-water systems at scale and is fully user-adjustable. Not a guarantee — actual results depend on plant design, climate and controls.

Chilled-Water AHU vs DX Operating-Cost Comparator

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