Double-Hung Windows

Double-Hung Windows Made in North America & Covered for Life

Double-hung windows from Castle Windows pair a traditional appearance with insulated glass and virgin vinyl construction. Both the upper and lower sashes operate for flexible ventilation, while the tilt-in design makes the exterior glass accessible from inside the home. Each window includes double-pane, double-strength glass for residential replacement applications.

Our double-hung windows are available with design options that can be customized to a homeowner’s specifications. Whether you want the replacement windows to coordinate with your home’s existing architecture or support a planned exterior update, we can help you select an appropriate look. Available choices depend on the product configuration selected for your home.

Double-Hung Window Construction & Weather Performance

Our Super-Energy-Saver windows include built-in features for durability, security, and year-round performance. Double-pane, double-strength glass and virgin vinyl frames are designed for exposure to wind, rain, debris, and heat. Dual locks support a tight closure and help limit air infiltration.

The insulated glass package includes low-emissivity glass and argon gas fills. Low-emissivity glass has a thin coating that helps reduce unwanted heat transfer through the glass. Argon is an insulating gas placed between the panes to further limit heat transfer. Actual performance depends on the complete window assembly, installation, climate, and condition of the surrounding wall.

Easy Cleaning & Care

Tilt-in sashes allow homeowners to clean the exterior-facing glass from inside the home. This eliminates the need to clean the glass from the outside during routine care. Cleaning needs can vary based on exposure to pollen, dust, salt, pollution, and other environmental conditions.

We recommend cleaning your windows two to three times per year. Use a soft cloth with dish soap and water to wipe down the frame. Tilt the sash inward, then clean the glass with a soft towel. Avoid rough tools or abrasive cleaners unless they’re specifically permitted by the product care instructions.

Energy Efficiency & Window Performance

The U.S. Department of Energy estimates that windows are responsible for 25% to 30% of residential heating and cooling costs*. That figure doesn’t mean every replacement project produces the same savings. Utility costs and indoor comfort are influenced by the home’s existing windows, insulation, air sealing, orientation, climate, and heating and cooling systems.

Insulated double-pane glass, low-emissivity coatings, argon gas, frame construction, and proper installation all affect window performance. U-factor measures the rate at which heat moves through a complete window assembly, with a lower number generally indicating better insulating performance. Replacing inefficient windows can reduce drafts and support more consistent indoor comfort, but actual energy savings vary from one home to another.

Lifetime Support for Double-Hung Replacement Windows

Castle Windows provides free lifetime service labor for covered warranty requests and 24-hour personal assistance for warranty service.

When comparing replacement window companies, review who manufactures the product, who is responsible for installation, which components are covered, whether service labor costs extra, and whether the warranty transfers when the home is sold. Our product, installation, and service commitments are structured to address each of those concerns.

Frequently Asked Questions

Why Are Double-Hung Windows Popular for Replacement Projects?

Double-hung windows combine a traditional appearance with flexible operation and ventilation. Because both the upper and lower sashes can move, homeowners can open either section independently or both at the same time. Their familiar design also works with many architectural styles.

Can Both Sashes on a Double-Hung Window Open?

Yes. Unlike single-hung windows, double-hung windows have two operable sashes. The upper and lower sashes can be moved independently, allowing homeowners to adjust airflow based on their preferences.

How Do Double-Hung Windows Improve Ventilation?

Opening both sashes creates ventilation at the top and bottom of the window. This allows warm air to escape through the upper opening while cooler outdoor air can enter through the lower opening. The amount of ventilation will depend on the window opening, outdoor conditions, and the home's overall airflow.

Are Double-Hung Windows a Good Choice for Second-Story Rooms?

Double-hung windows can be a practical option for upper floors because their tilt-in sashes allow the exterior glass to be cleaned from inside the home. This can make routine window maintenance easier when exterior access is difficult or inconvenient.

What Type of Glass Is Used in Castle Windows Double-Hung Windows?

Castle's double-hung replacement windows feature double-pane, double-strength glass. The insulated glass package also includes low-emissivity glass and argon gas fills, which are designed to reduce heat transfer through the window.

Do Double-Hung Windows Help Reduce Drafts?

Double-hung replacement windows can help reduce drafts when properly installed and sealed. Castle's double-hung windows feature dual locks and an interlock system designed to support a tight closure and limit air infiltration. Actual performance also depends on installation and the condition of the surrounding opening.

What Maintenance Do Double-Hung Replacement Windows Require?

Routine maintenance generally involves cleaning the glass and frame, removing dirt from the tracks, and checking that the sashes, locks, and other hardware operate properly. Castle recommends cleaning its double-hung windows two to three times per year using a soft cloth and mild soap and water.

Can I Clean Double-Hung Windows Without Going Outside?

Yes. The sashes on Castle's double-hung windows tilt inward, allowing homeowners to access the exterior-facing glass from inside the home. This feature can simplify routine cleaning, particularly for windows on upper floors.

Are Double-Hung Windows Available in Different Designs?

Yes. Castle's double-hung windows can be customized with various design options, allowing homeowners to coordinate replacement windows with their home's existing architecture or a planned exterior update. Available options depend on the selected configuration.

How Can I Tell If My Double-Hung Windows Need to Be Replaced?

Persistent drafts, difficulty opening or closing the sashes, condensation between panes, damaged frames, failed seals, or windows that no longer lock properly can indicate that replacement may be appropriate. A professional evaluation can help determine whether the problem requires a repair or a full window replacement.