Part 4/8:
Windows: European homes often feature high-performance triple-glazed tilt-and-turn windows, which provide excellent thermal performance. Although similar windows are available in America, their high cost and low availability hinder widespread adoption.
Insulation: The R-value and U-value metrics measure insulation performance, with the latter being particularly critical. Ferrell indicates that American insulation requirements vary widely due to the absence of a national building code. This inconsistency translates to a lack of optimum insulation in many homes.