Real-Wood Replacement. Vinyl replacement windows are easy to install and maintain, but they're not right for every project. Replacement wood sash kits with insulating glass are available from several manufacturers and often look more appropriate on older homes. The CrestFit Easy-Tilt Clad Sash Kit from Crestline makes it easy to update old windows while maintaining their period look. Available in custom sizes, the units come in eight clad colors and with eight grille options, including simulated divided lights that help complete the illusion of original fenestration. According to the manufacturer, a 2'-4" x 4'-6" double-hung with standard insulating glass costs $200 to $300. Crestline, 800/444-1090, www.crestlinewindows.com

Triple Tight. When a replacement window's energy efficiency is the primary concern, consider a triple-glazed unit. Uniframe Maxuus 10 from Great Lakes Window provides up to five times the energy efficiency of standard insulating glass and helps reduce sound transmission. Other energy-efficient features include a foam-filled frame, nonmetallic...

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