Determine whether IPMVP Option B or Option D is most appropriate for your project design:

Option B is based on engineering calculations using metered data and is generally more appropriate for buildings with non-interactive loads only.

Option D uses calibrated, whole-building energy simulations for both the baseline and design case and is generally more appropriate for larger, more complex building projects using an energy model. 

More tips on Option B versus Option D are below, at the end of Schematic Design.