4000 Picture

The EcoTherm 4000 line unites elegance and performance in a single, highly-efficient system. Engineered for strength and durability, with high-end features typically found only in the most expensive premium lines, the 4000 vinyl replacement window delivers superior value.

Better Windows for A Better World

4000 Picture

NFRC Thermal Performance Data
HP Low E0.323.130.290.54
Supra Low E Argon0.283.570.280.54
ST Stimulus0.273.700.280.54
DOE R5 Triple Glass Package0.

Standard Features

  • Thermal Fusion Welded Frame
  • Sleek Slimline Sash Profile
  • 3¼" Frame Depth
  • Also available in Rolling, Double Hung, and Hopper
  • DP 50 Rated
  • Interlocking Sloped Sill

Performance Options

  • ST Stimulus – Energy Star Approved Glazing Package
  • DOE-R5 Glazing Package
  • White, Beige and Bronze/White Colors
  • Cherry, Light and Dark Oak Simulated Woodgrain Interior
  • 14 Exterior Decorative Colors
  • Flat, Profile or SDL Grid Package
  • Foam Frame Wrap

© 2010 KASSON AND KELLER, INC. EcoTherm Window Systems, a quality product of Kasson and Keller, Inc. All rights reserved.