Review ASHRAE-55 section 6.1.1 to understand the credit documentation requirements. Assess these inputs:

Weather design conditions for peak load
Hours per typical year that outdoor temperatures exceed design conditions
Maximum design humidity
Design air speed
Radiant temperature asymmetry (refers to the changes in personal temperature around the body as affected by differences in nearby surface temperatures, such as heated floors and cold windows)
Vertical air temperature difference
Floor surface temperature
Drafts