import type { InsulationRoiInput, InsulationRoiResult } from './types.js';
/**
 * Calculate insulation ROI for pipes, vessels, or surfaces.
 *
 * bareHeatLoss = surfaceCoefficient × area × ΔT
 * insulatedHeatLoss = area × ΔT / (1/surfaceCoefficient + thickness/k)
 * annualEnergySaved = (bare − insulated) × hours / 1000 / boilerEfficiency
 * payback = installationCost / annualCostSaved
 *
 * @param input - Insulation parameters
 * @returns Insulation ROI result with heat savings and payback
 * @throws RangeError if surfaceArea, tempDifference, insulationK, or
 *   insulationThickness is not greater than 0
 */
export declare function insulationRoi(input: InsulationRoiInput): InsulationRoiResult;
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