Double hung windows are a popular and versatile window choice due to their ease of use, ventilation capabilities, and classic styling. But what exactly is a double hung window and how does it function? We’ll unpack everything you need to know in this complete guide.
What is a Double Hung Window?
A double hung window is a type of operable window that has two movable sashes, or panels, that slide vertically up and down within the window frame. Unlike single hung windows where only the bottom sash opens, both the top and bottom sashes of a double hung window can open and close independently.
This dual sash design is what gives double hung windows their signature look and allows them to provide better ventilation and airflow than other window types. The ability to operate both sashes also makes them easier to access and clean.
Main Components
There are a few key components that make up a double hung window:
- Sashes – The movable upper and lower panels that hold the window glass or glazing.
- Panes – The glass pieces fitted into the sashes. Available single pane or multi-pane.
- Frame – The stationary outer borders that enclose the sashes.
- Hardware – Parts like sash locks, lifts, and tilt mechanisms for operating the sashes.
Key Features
A few notable features help define double hung windows:
- Both sashes slide up and down vertically within the frame
- The sashes tilt inward to allow easy cleaning access
- One or both sashes can open for ventilation
Common Architectural Styles
Double hung windows complement many traditional home styles including:
- Colonial
- Cape Cod
- Victorian
- Cottage
Their classic divided lite look remains popular in new construction and remodeling projects alike.
How Does a Double Hung Window Work?
Now that we know what defines a double hung, let’s look at how this versatile window operates.
Sash Operation
A key benefit of double hung windows is the ability to move both the upper and lower sashes up and down independently:
- Each sash glides vertically in tracks within the frame
- The sashes lock securely into place when fully shut
- Opening one or both sashes allows fresh air to flow in
Tilt-In Feature
Double hung sashes also tilt inwards to allow easy cleaning access to the exterior glass from inside the home. Here’s how it works:
- Release the tilt latches located at the top of the bottom sash and the bottom of the top sash
- Carefully tilt each sash towards you
- Clean the exterior side of the glass
- Tilt the sashes back into place and re-engage the tilt latches
Opening and Closing
When operating a double hung window, homeowners can choose to either open one or both sashes. The lower sash tends to get opened more frequently since cool air naturally settles low. Opening just the bottom allows air flow while maintaining privacy and security. The top sash opens when maximum ventilation is needed.
Double hung windows bring in welcome daylight and views when open. Closing them keeps out weather and noise. The dual sashes seal tightly when shut, providing excellent insulation for comfort and energy savings.
Benefits and Advantages
There are many reasons double hung windows remain a highly popular design option among homeowners and builders:
- Easy to operate – Convenient cord pulls or locks allow easy raising or lowering of sashes from inside
- Safety features – Limit stops restrict how far sashes open to prevent falls
- Good airflow – Ability to open top, bottom, or both allows better air circulation than fixed windows
- Light and views – Clear glass lets daylight stream in, and open sashes provide outdoor views
- Easy to clean – Tilt-in feature allows cleaning both interior and exterior glass surfaces from inside
In addition, double hung windows filter outdoor sounds when closed, come in styles to match any home, and are available as energy efficient models. Newer safety, security, and smart home features make them better than ever.
Enhanced Security Features
Latest generation double hung windows boast upgraded security elements like multi-point locking mechanisms and interlocking sash designs. These make forced entry through the windows much harder. Glass breakage sensors alert homeowners to any breach attempts.
Low Maintenance
Technological advancements allow contemporary double hung windows to be built with long-lasting, protective materials that resist damage. As a result, they rarely require repainting, staining, or other preservation work. Easy care vinyl and fiberglass are growing in popularity.
Double Hung Window Components
While the basic structure is consistent, double hung windows vary somewhat in materials and options. Here’s a closer look at the different parts that make up a double hung window unit:
Sashes
Sashes are available in different styles:
- Double hung sashes are both operable and slide vertically
- Single hung units have one fixed top sash, one operable bottom
- Constructed of vinyl, wood, aluminum or fiberglass
Window Panes
Glass options include:
- Single, double, or triple insulated glazing
- Features like Low-E coatings or argon gas
- Decorative divided lite grid patterns
Frames
Frames provide an enclosure for the sash components. Choice of materials include:
- Vinyl
- Wood
- Fiberglass
- Aluminum
Color matched frames coordinate with a home’s interior.
Hardware
Essential hardware pieces allow smooth operation:
- Sash locks
- Tilt latches
- Lifting handles
- Counterbalance systems
Double Hung Window Buying Considerations
Ready to shop for new double hung windows? Keep the following aspects in mind:
Intended Use
Consider how the windows will be used. Usage factors like views, ventilation, egress, weather resistance, noise, and more impact options.
Performance Needs
Desired energy efficiency levels affect glazing, gas fills, weatherstripping and other components.
Size and Location
Measure accurately to get the perfect fit. Consider easy access for cleaning and operation.
Installation Type
New construction vs. replacement and full frame vs. inserts determine structural needs.
Budget
Double hung windows span a wide range of pricing levels based on materials, features and accessories.
Style Preferences
Choices like grids, hardware finishes, and color let you match your decor.
With so many options, double hung windows can be customized to suit any home. Primary categories include:
- Materials – vinyl, wood, aluminum, fiberglass
- Styles – single/double hung, architectural looks, divided lite grids
- Efficiency – low-E glass, argon gas, improved weatherseals
- Features – integrated blinds, security locks, smart controls
The double hung window’s versatile operating style will continue making it a top choice for allowing fresh air and daylight into homes for years to come.
