Southwall Technologies revolutionized window performance in 1979 when it introduced Heat Mirror, the clear selective film that launched the industry’s search for higher efficiencies and has contributed to improvements in windows ever since. And while Southwall continues to sell films to leading window and door manufacturers, the company is now manufacturing its own branded insulated glass. “The new subsidiary, Southwall Insulating Glass, will produce all types of Heat Mirror units,” says company spokesman John Miller, “including single-, double-, and triple-film units providing R-6 all the way up to R-20 center of glass.” The focus, however, will be on single-film insulating units, given their two-times performance over conventional double-pane glazings.
