Coeur d'Alene 4622 Double-Hung Window (4000 Series)

The Coeur d’Alene 4622 delivers U-factor 0.26 thermal performance that beats standard double-hung windows while featuring side-load design construction that outperforms typical tilt-in models. Built for Western US climates (Northwest region), this window combines serious energy efficiency with structural strength that handles Montana weather.

Superior Thermal Performance

The numbers tell the story. U-factor of 0.26 puts this window well ahead of basic double-hungs that typically run 0.30 or higher. SHGC of 0.19 blocks excessive solar heat gain — crucial for south-facing windows that can overheat rooms even during Montana winters.

Cardinal Low-E (E366/E270) with Argon fill drives these performance numbers. The dual Low-E coatings work differently — one reflects heat back into the room, the other blocks solar radiation. Combined with argon gas fill and XL Edge Stainless Steel spacers, the window creates a genuine thermal barrier.

Thermal Specifications	Value
U-Factor	0.26
SHGC	0.19
Visible Transmittance	0.45
Glazing	Dual-pane Cardinal Low-E (E366/E270) with Argon fill
Spacer System	XL Edge Stainless Steel

The 0.45 visible transmittance means you’re getting decent daylight despite the heavy Low-E coatings. Not as bright as clear glass, but the energy savings justify the trade-off.

Side-Load Design Advantage

The 4000 Series side-load design fundamentally differs from standard tilt-in double-hungs. Instead of pivoting inward for cleaning, these sashes remove completely from the side. Sounds like a small detail until you understand the structural implications.

Structural Performance	Value
Design Pressure	45.11 PSF
Structural Test Pressure	67.6 PSF
Water Resistance	8.35 PSF
Air Infiltration	0.19 cfm/ft²
Performance Class	LC-PG25

67.6 PSF structural test pressure means this window survived hurricane-force wind loads in testing. The side-load design eliminates the weak pivot points that fail in standard tilt-in models. Air infiltration at 0.19 cfm/ft² beats many fixed windows — remarkable for an operable unit.

Professional Installation Requirements

AAMA-2400-02 and AAMA-2410-13 installation standards apply. Proper flashing and sealant application (OSI recommended) are critical for warranty. Use certified installers — this isn’t a DIY product.

The Nu-Wall setback design specifically targets remodeling applications. Frame depth of 3-1/4 inches fits standard wall construction without special modifications.

Warranty Coverage

Lifetime Limited Warranty on frame, sash, and glass unit covers the original purchaser. Transferable to second owner; coverage reduced to 10 years on frame/hardware and 20 years on glass from original installation date. Service requests handled through local dealers or Coeur d’Alene service department.

Bottom Line

Worth considering for energy-conscious builds where thermal performance drives the decision. The 0.26 U-factor significantly beats code minimums and most competing double-hungs. Side-load construction adds genuine structural advantages over tilt-in designs — not just marketing fluff.

Overall brand rating of 4.1 out of 5 stars suggests solid real-world performance. The window suits contractors focused on energy efficiency and structural integrity rather than rock-bottom pricing.

Frequently Asked Questions

What makes the side-load design stronger than standard tilt-in windows?

Side-load removable sashes eliminate the pivot hardware that creates weak points in tilt-in designs. The sashes slide out completely from the side channels, maintaining full frame integrity. This construction method produces 67.6 PSF structural test pressure ratings that exceed most residential requirements.

How does the U-factor of 0.26 compare to Montana energy codes?

U-factor 0.26 exceeds Montana’s Climate Zone 6 requirements by a significant margin. Most code-minimum windows run 0.30-0.32. The lower U-factor translates to measurable heating bill savings, especially with Montana’s long heating season.

Is professional installation really necessary?

Yes. Proper flashing and sealant application (OSI recommended) are critical for warranty. The window must meet AAMA-2400-02 and AAMA-2410-13 installation standards. Improper installation voids warranty coverage and defeats the high-performance design.

What’s included with the window?

Window screen (fiberglass mesh), locking hardware (cam locks), and integrated sash pulls come standard. No mention of additional trim pieces or installation materials — those are contractor-supplied.

How does it perform in very cold temperatures?

The XL Edge Stainless Steel spacer system resists condensation better than aluminum spacers. Combined with 0.26 U-factor performance, the window should minimize interior condensation even at -20°F outdoor temperatures. The dual Low-E coatings keep interior glass surfaces warmer than single Low-E options.