So, what is the difference between the indoor and outdoor temperature? Once your building is designed and constructed, this becomes the key question. You want to design for the design summer and winter conditions.
Understanding the energy code requirements and how to properly calculate the fenestration U-factors is an important skill to develop to inform the building-enclosure design
The American Iron and Steel Institute has published the findings from research conducted to support the development of a calculation methodology for determining the U-factors and R-values for wall assemblies containing cold-formed steel.
