Double Hung Windows

A double-hung window has two operable sashes that slide vertically. You can open the top sash, the bottom sash, or both at the same time for flexible ventilation. The tilt-in design makes cleaning simple from inside the home. This classic style works well with traditional and modern architecture.

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Rated to 200 °F

The Onyx Collection keeps vinyl double hung windows performing at temperatures up to 200°F. This exceeds standard vinyl (typically rated around 162°F) and helps both upper and lower sashes keep their shape. Even black vinyl windows stay smooth to lift, lower, and lock in hot climates, supporting energy-efficient windows performance.

Engineered for Stability

The Onyx Collection resists window warping so double hung sashes stay square and track correctly. Heat, sun, and moisture can cause expansion or shrinkage, but this onyx profile maintains dimensional stability. Balanced springs, dual weatherstripping at the meeting rail, and rigid sash corners help seals stay tight for reliable comfort and easy tilt-in cleaning.

Long-Lasting Deep Color

The Onyx Collection preserves its deep onyx color under UV exposure and temperature swings. The distinctive shade pairs well with aluminum windows and doors for a modern look beyond white vinyl. The Onyx Collection profile meets ASTM International and AAMA standards. With qualifying glass, the series also meets the latest NFRC Energy Star 7.0 requirements for strong thermal performance and long-term comfort.

Frequently Asked Questions

What’s the difference between a double-hung window and a single-hung window?

Both have two stacked sashes. On a double-hung window, the top and bottom sashes open. On a single-hung window, the bottom sash opens and the top sash is fixed. That’s the key functional difference.

Advantages of a double-hung window

More fresh air: Open both sashes to release warm air at the top while drawing cooler air in at the bottom.
Easier cleaning: Tilt-in sashes let you clean interior and exterior glass from inside.
Safer ventilation: Opening the upper sash allows airflow while keeping the lower sash closed, useful on first floors and in children’s rooms.

When to choose a double-hung window

Pick double hung windows when upper-level cleaning convenience matters, when you want a hung-window look with strong ventilation in smaller rooms, or when you prefer the option to vent from the top or bottom based on the season.

Energy efficiency: double hung vs single hung

A single-hung window can be slightly more efficient because the top sash is fixed. That said, double hung windows can achieve strong energy performance with the right options: Low-E coated glass, argon gas fill, warm-edge spacers, and (where available) dual- or triple-pane glass matched to your climate. Proper installation and air sealing are also key to overall efficiency.

GLASS

Creating your own insulating glass unit (IGU) by following three simple steps

Step 1: Type of Glass

Annealed |Tempered | Laminated

Annealed Glass

Clear, standard glass with excellent clarity and value for everyday applications.

Tempered Glass

Heat-treated for additional strength and safety. If broken, it crumbles into small pieces to help reduce injury risk.

Laminated Glass

Two sheets bonded with a safety interlayer. Enhances security, improves sound control, helps block UV, and holds together on impact.

Step 2: Dual-pane / Triple-Pane

Dual-Pane IGU

Two panes separated by a warm-edge spacer with argon gas between the panes. A balanced choice for clear views, insulation, and cost.

Dual-Pane Glass Diagram with LoE 366 and Lami. Glass

Triplepane Glass Diagram with Two LoE 366 Glass

Triple-Pane IGU

Three panes with two spacers and argon gas in both chambers. Higher insulation and better sound control. Available on select sizes.

Step 3: Energy-Efficient Coated Glass

LoE 366

Triple layer coating glass for outside solar control. Helps manage heat gain while keeping interiors bright.

LoE i89

Four layer coating clear glass for room-side efficiency. Enhances insulation and supports maximum energy savings.

Step 4: Color & Pattern Options

Choose from a range of pattern glass designs to add privacy and character to bathrooms, entry areas, and other spaces. These options bring dimension to windows or doors while maintaining natural light.

Matte

Bamboo Glass

Glue Chip

Obscure

Grey

Bronze

Reeded

Rain

Delta Frost

GRID

Grid Between the Glasses

The grille sits between the panes, so you get the look you want and an easy-to-clean glass surface with no exterior bars to wipe around. *We also offer Simulated Divided Lite (SDL) grids for specific window and door styles. SDL options require additional lead time and cost. Please contact our sales team for details.

Flat Grids Size: 5/8, ¾

Sculptured Grid Size: 5/8, 1

Grid Patterns

Available patterns include Marginal, Double Prairie, Colonial, and Marginal MG18.

*Grid patterns allow wide customization but are limited to vertical and horizontal orientations. *Geometric picture windows have specific grid pattern options. Please contact our sales team for more information.