The new Zenith series ZR10 double-film fixed picture window from Alpen High Performance Products offers a .10 U-factor—which corresponds to an R-value of 10—reportedly the highest of any commercially available, U.S.-made window. The high-performance windows block 99% of UV rays, resist condensation and air infiltration, reduce noise, and offer warm interior glass surface temperatures in cold-climate winters and cool interior glass surface temperatures in warm regions, says the maker. Pricing varies. thinkalpen.com/r10window
