Double Hung Window

Learn more about Double hung Windows through our curated articles, covering everything from size selection and installation tips to maintenance advice and comparisons with other window types. Click the titles below to read each guide in detail.

What Is a Double-Hung Window?

A double-hung window—also known as a double-sash window, two-over-two window, vertical sliding window, hung window, up-and-down window, or twin sash window—is a traditional window design featuring two sashes that slide vertically within the frame. Unlike single-hung windows, where only the bottom sash moves, both the upper and lower sashes in a double-hung window are fully operable. This allows for precise ventilation, letting warm air escape through the top while drawing cooler air in through the bottom.

Key Features and Benefits

  • Dual Operable Sashes: Both sashes slide up and down independently, allowing precise airflow control—warm air can escape through the top sash while cooler air enters from the bottom.

  • Enhanced Ventilation: Natural airflow reduces reliance on air conditioning, helping cut energy costs.

  • Tilt-In Cleaning: Most models tilt inward, making it safe to clean both interior and exterior glass without ladders.

  • Energy Efficiency: With Low-E coatings, double or triple glazing, and insulated frames, double-hung windows minimize heat transfer and meet ENERGY STAR® standards (U-values as low as 0.24 W/m²K).

  • Material Options: Available in vinyl (affordable), wood (classic charm), aluminum (durable), or composite (weather-resistant).

  • Noise Reduction: Double-pane glass with gas fills reduces exterior noise for a quieter home environment.

With their combination of versatility, ventilation control, energy efficiency, and classic style, double-hung windows remain a popular choice for homeowners looking for both function and aesthetics.

ABOUT Double-Hung Windows FAQ

Both sashes slide independently on counterbalanced tracks. Lower the upper sash to exhaust warm air or raise the lower sash to draw in cool air, creating a natural airflow cycle.

  • Double-Hung: Both sashes move, offering flexible ventilation and easier cleaning.
  • Single-Hung: Only the lower sash operates, limiting airflow and cleaning options.

Yes! Low-E coatings, argon-filled glazing, and insulated frames reduce heat loss and meet International relevant certification standards, lowering heating/cooling costs.

Most modern double-hung windows feature tilt-in sashes—simply release the tilt latch and swing each sash inward to clean both interior and exterior surfaces safely from inside your home

Frame materials include vinyl for cost-effectiveness,  aluminum for structural strength, fiberglass for durability, and composite materials that combine the benefits of multiple substrates

High-quality double-hung vinyl windows typically have a lifespan of 20 to 30 years, with premium brands sometimes offering up to 40 years of service when properly installed and maintained

Accurate installation requires measuring the rough opening at three points—top, middle, and bottom—for width, and left, center, and right for height; then, select a window size slightly smaller (about ⅜” clearance) to allow for shimming, leveling, and proper sealing

Annually inspect and lubricate the sash balances and tracks, check seal integrity and flashing to prevent drafts or leaks, and clean sash locks and weatherstripping to ensure smooth operation and long-term performance

Opt for double-hung if you value maximum ventilation and easy cleaning; choose single-hung for slightly better energy efficiency and lower initial cost

Often yes—replacement inserts are designed to fit within existing jambs, though frame condition and local codes should be assessed before installation

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