For each option, standardize quantities, specifications, service intervals, cleaning regimes, and refresh triggers. Note warranties and service coverages. Model downtime as a cost, not an afterthought. Ensure every line item exists across scenarios, even as zeros, so nothing hides in footnotes or inconsistent scope definitions.
Apply a discount rate reflecting your weighted average cost of capital or policy guidance. Run sensitivities on lifespan, failure rates, salvage values, labor costs, and carbon fees. Stress-test extreme churn or occupancy changes. This surfaces breakpoints where one choice overtakes another under plausible real-world conditions.
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