The Silverline 9500, Milgard Style Line Series and Simonton Reflections 5050 are highly rated replacement windows, according to Replacement Window Reviews. Other top picks include the PGT 2300 SpectraGuard, HiMark Enviro-Star 800 and Okna 500 Series.
The Silverline 9500 is a vinyl double-hung replacement window with a curved profile. This energy-efficient window has two tilting sashes, vent latches and an optional lock.
Windows in the Milgard Style Line Series have plain vinyl frames and optional screens. They come in eight finishes as of 2015 and have a lifetime warranty. Milgard also offers glass breakage protection plans.
The Simonton Reflections 5050 is a vinyl replacement window available in double-hung, slider, picture and geometric styles. It features extensive weatherstripping, insulated glass and color-coordinated hardware.