The most beneficial approach is to first select a series of potential interventions and model each of them individually, so as to understand the independent impact of each accurately. Since it takes time to generate the model and run the simulation for each variable, project budgets typically require judiciousness in selecting each option. [...] comparing the combination projects, one can now see that the anticipated additional 10 percent in energy savings offered by the major intervention scope over the minor intervention scope is not a particularly good investment from a financial perspective.
Saving Energy in Historic Buildings Balancing Efficiency and Value Energy modeling and life-cycle costing can help identify simple steps to make a historic building more energy efficient, addressing both preservation and sustainability concerns. by John H. Cluver and Brad Randall This article originally appeared in vol. 41, no. 1, of the APT Bulletin, the journal of the Association for Preservation
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