4000 Double Hung

Timeless elegance and exceptional thermal performance make the 4000 series ideal for larger spaces and window arrays. They feature premium construction throughout, with a high-grade block and tackle for a lifetime of smooth operation. Quad weather stripping and a magnetic seal offer outstanding protection against thermal and wind penetration, and the tilt-in sashes make cleaning a breeze.

For style, quality and energy efficiency, the 4000 offers the best of all worlds.

Better Windows for A Better World

4000 Double Hung

NFRC Thermal Performance Data
HP Low E0.342.940.260.49
Supra Low E Argon0.303.330.260.49
ST Stimulus0.293.450.260.49
DOE R5 Triple Glass Package0.214.760.210.39
DOE R5+ Triple Glass Package0.

DOE-R5 Glazing Package

EcoTherm’s DOE-R5 Glazing Package is ideally suited to deep energy retrofits. With a best-of-class R5 factor, it outperforms all Energy Star and Federal Tax credit requirements by more than 30 percent, for comfortable living on a more comfortable budget.

The colors of ecotherm

Our broad palette of traditional and contemporary colors opens a wide world of possibilities. All 14 colors are hand-applied and UV cured, for outstanding resistance to fading. Interior woodgrain laminates and brushed hardware are also available, to match nearly any design style.

Standard Features

  • Foam-Filled Frame and Sash
  • Thermal Fusion Welded Frame and Sash
  • Sleek Slimline Sash Profile
  • Quad Weather-Stripping at Key Contact Points
  • Block and Tackle Balance System
  • 3¼" Frame Depth
  • Available in Rolling, Picture Window and Hopper
  • Full Length Lift Handles
  • Locking Half Screen
  • Approved Forced Entry Locking System
  • Sash Tilt In for Easy Cleaning
  • Double Recessed Meeting Rail Locks
  • DP 50 Rated
  • Interlocking Sloped Sill
  • Dual Night Latches

Performance Options

  • ST Stimulus – Energy Star Approved Glazing Package
  • EcoTherm R5+ Glazing Package
  • DP 65 Upgrade
  • White, Beige and Bronze/White Colors

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