Option A

Option (A) Retrofit Isolation: Key Parameter Measurement -- Savings are determined by field measurement of the key performance parameter(s) which define the energy use of the energy conservation measure (ECM) affected system(s) and/or the success of the project. Parameters not selected for field measurement are estimated. Estimates can be based on historical data, manufacturerÕs specifications, or engineering judgment. Documentation of the source or justification of the estimated parameter is required.