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
Glazing	U-Value	R-Factor	SHGC	VLT
Clear	0.45	2.22	0.56	0.58
HP Low E	0.34	2.94	0.26	0.49
Supra Low E Argon	0.30	3.33	0.26	0.49
ST Stimulus	0.29	3.45	0.26	0.49
DOE R5 Triple Glass Package	0.21	4.76	0.21	0.39
DOE R5+ Triple Glass Package	0.19	5.26	0.21	0.39

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