Deep Summer, Deep South Graph of Data Gathered During Study
The Graph above was part of a Clemson University Thermal Study at the HFA Field Test in Columbus, Georgia. Each spike represents one day. The black line represents the exterior wall temperature which reaches 110 degrees Fahrenheit during this period. The red line hovers a few degrees around 70 despite the outside wall temperature some 12 inches away. This is the power of thermal mass at a glance.
The predominantly accepted climate for effective thermal mass has been limited to Southwestern United States type environs where extremely wide diurnal swings occur. But the data here shows clearly that when one of the most ancient forms of building is coupled with new technologies such as a foamed rafter envelope, a surprisingly energy efficient combination occurs beyond the Southwest boundary.