In recent years major advances have been made in the development of computational tools for architects to facilitate building performance evaluation. However, most tools require expert knowledge and remain accessible primarily to building engineers or specialized architects. This article presents a methodology of interpolating data for energy analysis to enable easier implementation of building simulation in the design process. Architects and other building project participants can visualize and analyze complex thermal performance of buildings for different design scenarios, requiring little specialized knowledge and without a burdensome computational cost.