The Double Hung Window Term Defined

Windows are an essential part of any home. They allow natural light to enter and provide ventilation. With so many window types to choose from, it can get confusing for homeowners . One popular style is the double hung window. But what exactly does this term mean?

We also compare double hung windows to single hung windows, a similar style. By the end, you'll have a clear understanding of this classic window design that brings both form and function.

What is a Double Hung Window

A double hung window is a type of window with two movable sashes, allowing for ventilation from both the top and bottom. The sashes can be operated independently, making it a versatile option for different weather conditions.

Formal Definition

The formal definition describes a double hung window as having:

• An upper and lower sash that both slide vertically to open and close
• Sashes held in place by a counterbalance system of weights or springs when shut
• Locking mechanisms on the lower sash to secure the window when closed
• Sashes operated by lifts, handles, or finger grooves on the bottom rail

Operable Upper and Lower Sashes

The defining trait of a double hung window is having two operable sashes that move independently. The upper and lower sashes both slide vertically in separate tracks to open and close. This allows you to ventilate from both the top and bottom of the window.

Allows Ventilation and Air Flow

With both sashes operable, double hung windows offer more ventilation flexibility. On hot days you can open just the bottom sash to catch a breeze while avoiding full sun exposure. During spring and fall you can leverage airflow by opening both sashes. This versatility suits different climates and heating/cooling needs.

Available in Different Materials

Today's double hung windows come in a range of materials like:

• Wood - aesthetically pleasing but requires more maintenance
• Vinyl - low maintenance and energy efficient
• Fiberglass - durable, resists warping from heat/cold
• Aluminum - affordable option but conducts heat/cold more

Within these main categories are different grades, colors, and finishing styles to match home architecture and budgets.

Main Parts of a Double Hung Window

Upper and Lower Sashes

The upper and lower sashes are the movable panels that slide vertically past each other when opening. Traditional wooden sashes feature multiple individual panes separated by muntins . More modern versions often have a single pane of glass per sash without divider bars.

Frame and Casing

The main frame encases the window, while interior and exterior casing trims out the frame for a clean installation. For weatherproofing , compression or weather seals run between the sashes and frame.

Balance Systems

Double hung windows need counterbalances to hold the sashes in place. Otherwise, gravity would just cause them to slide down when open. Balance systems consist of weights and pulleys, springs, or block and tackles.

Locks and Lifts

Locking mechanisms on the interior lower rail allow you to secure the bottom sash when shut. On the other hand, lifts or finger grooves make the sashes easier to slide open and closed.

How Double Hung Windows Work

Now that you know the key parts of a double hung window, how do they actually function? Here's a quick rundown:

Sashes Slide Vertically in Tracks

The upper and lower sashes each move independently along vertical side tracks. Protruding balance shoe fittings connect the sash to the counterbalance system.

Held in Place By Balance Systems

Balance systems hold the sashes in place so they don't slide down from gravity. As the sash goes up, connected weights go down in unison, or springs compress and extend.

Locks Allow Sashes to Be Secured

Locking mechanisms keep the bottom sash securely shut when engaged. Some also allow a partially open position for limited ventilation. Locks boost household safety and prevent wind damage.

Operable by Lifts/Handles

Embedded finger grooves, recessed cups, or mounted handles make operating double hung windows effortless. You simply grab and slide up or down to open and shut.

Pros and Cons of Double Hung Windows

Double hung windows have stood the test of time thanks to their aesthetic versatility and reliable functionality. But they aren't perfect. Below we break down key upsides and downsides.

Pros:

• Better airflow : Double-hung windows allow for better airflow, especially on higher floors, due to the ability to open both the top and bottom sashes.
• Easy cleaning : Many double-hung windows come with tilt functionality, making cleaning the interior and exterior panes much easier.
• More versatile: Double-hung windows are more versatile than single-hung windows, as they offer greater flexibility for ventilation and light control.
• Enhanced functionality: Double-hung windows have become increasingly popular in new homes and constructions because they offer enhanced functionality, such as improved airflow and easier cleaning.
• Wider variety of options: Double-hung windows offer a wider variety of options, including frame materials, glass types, and finishing styles.

Cons:

• Higher cost: Double-hung windows generally cost more than single-hung windows due to the additional hardware and functionality.
• Potential maintenance issues: The double-hung window design can be more complex and therefore require more maintenance, as there are more moving parts to potentially break down.

Comparison with Single-Hung Windows

Single-hung windows are extremely similar to double-hung windows. But what's the actual difference between these two classic styles?

Number of Operable Sashes

The key difference between single-hung and double-hung windows is the number of operable sashes . A single-hung window only has an operable lower sash, while a double-hung window has operable upper and lower sashes.

Price

Double-hung windows generally cost more than single-hung windows due to the additional hardware and functionality.

Ventilation

Double-hung windows offer greater flexibility for ventilation due to the ability to open both the top and bottom sashes.

Cleaning

Many double-hung windows come with tilt functionality, making cleaning the interior and exterior panes much easier.

Functionality

Double-hung windows offer enhanced functionality, such as improved airflow and easier cleaning, compared to single-hung windows.

There you have it--a comprehensive dive into the components, workings, pros/cons and key differences of double hung window designs. With two movable sashes for enhanced temperature and light control, double hungs bring versatile ventilation . They suit a range of architectural styles too.