Rooftop Unit Efficiency Payback Estimator

A rough, order-of-magnitude look at annual cooling-energy savings from replacing an aging standard-efficiency RTU with a modern high-efficiency unit. Directional only.

Unit size Annual cooling run hours Electricity rate ($/kWh)

estimated annual cooling-energy saving vs. an old standard-efficiency unit

Old-unit annual cooling energy

High-efficiency annual energy

Assumed efficiency gain~30%

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Rough model: replacing a 15+ year old RTU with a current high-efficiency unit yields ~25–40% cooling-energy savings (industry range). Assumes ~1.1 kW/ton at part-load on the baseline and a 30% reduction; excludes rebates ($50–200/ton), heating and demand charges. Use the DOE/PNNL RTUCC or a Koven quote for a real number.

Rooftop Unit Efficiency Payback Estimator

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