The drawing space allows you to draw over an architectural plan after importing underlays (. PNG's) into the workspace. Once imported, a quick sequence of calibrating and setting user preferences allows drawing thermal zones or spaces. The process is repeated for all zones and levels of the building.
An underlay is typically an architectural plan converted into a .PNG (< 1 MB). The architectural plan should include dimensions, the building's cardinal direction, and all areas applicable to the assessment.
Import underlays by selecting ‘Underlay’ in the drawing space ribbon, press ‘+ Underlay’ and then locate the converted .PNG (< 1 MB) from your local drive.