This Pella 150 Series two-wide single-hung window unit measures 72" x 72" and is optimized for high-altitude use in Denver and the surrounding region. Features Low-E 180/189 coating with argon gas fill for superior energy efficiency, with NFRC-certified ratings of U-Factor 0.25, Solar Heat Gain Coefficient 0.45, and Visible Transmittance 0.55. Includes tempered glass on the vent sash and a classic colonial grid pattern. ENERGY STAR certified. White vinyl frame in excellent, like-new condition. Screens included. Suitable for residential replacement or new construction installations.