Calculation for Building Envelope Performance:

1. For each hour of the year, the energy model needs to determine how much heat transfer occurs through the building envelope.
2. The energy model calculations need to account for how the foundation shape and material affect heat transfer to the surrounding underground soil.
3. The energy model calculations need to account for the orientation of the building on the site, so that solar gains are properly determined.
4. Thermal mass effects of the contents in a home (i.e. furniture, rugs, plants) are not to be included, whereas components of the house (i.e. concrete slab, masonry wall) are.