In recent years, there has been a push by some intervenors and program implementers to move larger and larger, and riskier measures from custom efficiency into prescriptive buckets. These include air handling system replacements, control system replacements, and of course, the variable frequency drive. To make sure everyone is on board, prescriptive savings are determined for a specific piece of equipment, or determined by preset formulae with some combination of stipulated (assumed) values and project-specific information. This is opposed to custom savings calculations that are estimated by an engineer/philosopher according to the project specific application. Uncertainty If there are two…
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