Featuring a tilt-in design, these windows allow for safe, interior cleaning of both sashes

Interlocking meeting rails create a tight seal at the mid-point of the window when both sashes are closed

Dual, independent sash operation puts you in control — optimize airflow without sacrificing comfort or efficiency

Durable framing, multi-layer sealing, and premium hardware

Double Hung Windows

A double hung window has two independently sliding sashes that both move vertically within the frame. Either sash can be raised or lowered to control airflow, and both tilt inward for exterior glass cleaning without going outside. Window Force double hung windows are built on the Classic Series 3 1/4" platform in lead-free uPVC with fusion-welded corners, an integrated balance system in both sash channels, and interlocking meeting rails.

Dual sashes

Tilt-in mechanism

Sealed unit

Internal chambers

uPVC material

Jamb extensions

Fusion welded corners

Inside trim

Outside vinyl brickmoulds

Two operable sashes
for ventilation

Tilt-in function
for easy cleaning

Multi-point
locking systems

Smooth sash
operation

Key
Features

Both sashes slide vertically and operate independently

Both sashes tilt inward for exterior glass cleaning from inside

Greater ventilation control: open top, bottom, or both sashes

Integrated balance system in both sash channels

Interlocking meeting rails for mid-point seal

Cam lock engagement hardware

Optional flush bolt system

Multi-chamber lead-free uPVC frame and sash

Fusion-welded corners including interior walls

Optional interior removable screen

How It Works

Both sashes in a double hung window operate on vertical slide channels, each supported by independent spring-loaded balance cartridges calibrated to sash weight. The bottom sash slides up and the top sash slides down; both can be open at the same time, which creates a stack effect — warm air exits from the top opening while cooler air enters from the bottom. Each sash pivots inward independently for cleaning. The cam lock at the meeting rail secures both sashes when closed.

Where It Works Best

Double hung windows suit any application where flexible ventilation control matters. Opening the top sash alone allows warm interior air to rise and escape while keeping the lower portion closed — useful in rooms where a floor draft is unwanted, or where children or pets need a safer window. Both sashes open for maximum airflow. The traditional sash-and-rail profile makes double hung windows the standard choice in colonial, craftsman, and heritage-style homes, and their in-plane operation makes them appropriate for spaces beside walkways or patios where a casement would obstruct passage.

Series Availability

Ultraslim Series

Reduced visible profile 2 1/8″ with deeper frame depth 4 9/16″
Maximized glass area and clean sightlines
Hidden gasket design
Optimized for new construction and larger openings
Contemporary architectural appearance

Explore the Ultraslim Series

Classic Series

Proven standard-profile frame design, 3 1/4″ platform
Optimized for retrofit and replacement applications
Reliable compatibility with a wide range of installation conditions
Balanced performance and traditional aesthetics
Double-pane only, 3 1/4″ sealed unit

Explore the Classic Series

Frame & Structural Design

uPVC The window system is manufactured using uPVC vinyl extrusion supplied by Vision Extrusions Group, a North American manufacturer specializing in high-performance vinyl profiles. The material is formulated to provide long-term dimensional stability, impact resistance, and resistance to discolouration under varying environmental conditions.

Internal Chambers These windows have the highest number of internal chambers, giving them out-standing insulation and sound abatement qualities, as well as thermal efficiency and increased sturdiness.

Fusion Welded Corners Provide attractive appearance & eliminate the need for adhesive and sealants. There are no imperfections on the completely watertight and airtight surface, Interior walls are also welded.

Outside Vinyl Brickmould

Inside Trim

Jamb Extensions A choice of maintenance-free uPVC, solid vinyl and wooden jamb extensions, frame moldings and corner blocks are available to enhance inside finish.

Sealed Units Sealed glass unit has 13/16” overall thickness. Depending on the model, glazing and different types and thicknesses can be applied, including double, triple and Low-E glazing (3/4” to 1-1/8)

Hidden Gasket Concealed sealing without visible rubber lines.

Dual sash-channel geometry in the frame allows both sashes to travel the full height of the opening independently

Welded corner construction including interior walls — no adhesives or sealants, fully airtight and watertight at all four corners

Integrated balance system in both upper and lower sash channels — each cartridge weight-calibrated to its respective sash

Interlocking meeting rails create a tight seal at the mid-point of the window when both sashes are closed

Double-glazed only: 3/4″ sealed IGU; triple-pane is not available in hung configurations

Locking System

Cam Lock at Meeting Rail

A cam lock at the meeting rail draws both sashes together and maintains consistent seal pressure at the most common air infiltration point in a double hung window. The cam engages with a simple rotation and provides positive tactile confirmation when the lock is set.

Dual Tilt-In Sash Design

Both sashes on Window Force double hung windows pivot inward on independent tilt mechanisms. Either sash can be tilted without disturbing the other, allowing targeted cleaning access. The tilt mechanism disengages the balance cartridges temporarily and re-engages when the sash is returned to the vertical operating position.

Integrated Dual Balance System

Independent spring-loaded balance cartridges in the upper and lower sash channels counterbalance each sash. Both sashes can be held open at any height with minimal effort, and the cartridges are calibrated to sash weight at manufacture for smooth operation throughout the unit’s service life.

Hardware Components

Cam lock at the meeting rail for sash-to-sash closure and seal

Flush bolt system (where applicable) for additional security

Optional interior
removable screen

Glazing Options

LoĒ-180

Surface 2

High solar heat gain for north and east elevations in cold climates

LoĒ-272

Surface 2

Solar control for south
and west elevations

LoĒ-366

Surface 2

Advanced solar control for high solar exposure

LoĒ-i89

Surface 4

Interior heat reflection for U-factor reduction

Neat+

Self-cleaning coating for exterior surface applications

Privacy

Obscured and decorative glass textures available

Safety

Tempered glass where required
by code or application

Spacer

Technoform rigid thermoplastic or Super Spacer flexible foam

Only double-pane sealed Insulated Glass Units available for hung windows, 3/4″ overall thickness

Argon gas fill comes standard in every unit to improve the overall thermal performance

Triple-pane is not available in single hung window configurations

Configurations

All Window Force window types support standardized customization options across Classic and Ultraslim Series, ensuring compatibility and clean integration across mixed window projects.

Colour Options

At Window Force, we offer a carefully curated palette of durable, fade-resistant colours designed to match any architectural style, from classic to contemporary.

Explore Colour Options

Glass Options

We provide a wide range of advanced glass types tailored for modern window systems. From partially transparent decorative glass with artistic textures for enhanced privacy, to high-performance Low-E coatings that improve energy efficiency.

Explore Glass Options

Jambs, Casing, Brickmoulds

Jambs, casings, and brickmoulds come in a variety of sizes to suit different needs, and they're available in a full color palette to complement your design vision. These components provide versatile options for functional and aesthetic window finishing.

Explore Options

Grills Options

If you want to enhance your windows with decorative pane patterns, we offer a flexible range of interior grill shapes to choose from — from the most common layouts to fully custom designs made to fit your style.

Explore Grills Options

Energy Performance

Glazing Type	U-Factor, W/(m²·K)	SHGC	Energy Rating
Double Pane	1.48 – 1.51	0.53 – 0.55	35 – 38

Performance values vary based on glazing configuration, frame series, and overall window size.

Certified Performance Data

Certified performance values are available for select double hung window configurations and are verified through NRCan and NAFS testing. The table below outlines tested and registered window configurations based on glazing package and ENERGY STAR® zone compliance.

Model	DHT_IS_CLRCARD-ARG90-CARD180#3	DHT_IS_CLRCARD-ARG90-CARD180#3-ARG90-CLRCARD
U-factor, W/(m²·K)	1.71	1.66
Solar Heat Gain (SHGC)	0.52	0.47
Energy Rating	31	30
ENERGY STAR Zones, 2015	1 \| 2	1 \| 2
ENERGY STAR Zones, 2010	ABC	ABC
Layers of Glazing	2	3
NRCan Reference	NR9161-12602012-ES	NR9161-12602016-ES
Energy Efficiency Verification Reference	W535-1	W535-1
U-factor, Btu/(h·ft²·°F)	0.3	0.29
Visible Transmittance	0.59	0.54
Air Leakage — Infiltration, l/(s·m²)	0.44	0.44
Air Leakage — Exfiltration, l/(s·m²)	0.76	0.76

Actual performance values vary by glazing package, series selection, and configuration.

Size Limitations

Pane	Width, min — max	Height, min — max	Max Sq.Ft.
Double Glass	15" — 46"	28" — 58"	21 sq.ft.

Actual size limits may vary based on series selection, glass thickness, and project-specific requirements.

Warranty Coverage

Full warranty details

Up to 25 years: 100% factory coverage, 0% dealer/client
25–30 years: 80% factory coverage, 20% dealer/client
Over 30 years: 25% factory coverage, 75% dealer/client

Glass warranty: 10-year non-prorated sealed unit warranty covering seal failure, internal condensation, and visual obstruction between glass panes

Window Force provides warranty coverage on materials and manufacturing defects under normal use and service conditions. Claims are handled directly through Window Force. Inspection and resolution are coordinated by the factory. Repair or replacement is determined based on assessment.

Covered:

Manufacturing defects in window components, sealed glass unit failure under normal conditions, hardware performance under standard use

Not Covered:

Installation-related issues, damage during handling or after delivery, structural movement or excessive humidity, misuse or modification

Frequently Asked Questions

Everything you need to know about the product and billing.

How does a double hung window differ from a single hung window?

In a single hung window, only the bottom sash slides — the top is fixed. In a double hung, both sashes travel vertically and both tilt inward for cleaning. The practical differences are ventilation control (you can open the top, bottom, or both) and cleaning convenience (either sash can be reached and cleaned from inside). Double hung windows are generally more expensive than single hung because of the additional balance hardware and sash components.

What is the ventilation advantage of opening both sashes at once?

Opening the top and bottom sash at the same time creates a stack-effect airflow: warm indoor air is less dense and tends to rise, so it exits through the upper opening while cooler outside air enters through the lower opening. This passive convection can move air through a room without a fan. The effect is most pronounced when the temperature difference between inside and outside is significant, which is common in spring and fall in most Canadian climates.

Can both sashes be cleaned from inside the building?

Yes. Both sashes on Window Force double hung windows tilt inward independently. The bottom sash tilts in for access to its exterior surface, and the top sash tilts in separately for access to its exterior surface. Neither requires outdoor access or a ladder, which makes double hung windows practical for upper floors and high-wall installations.

Are double hung windows available in triple-pane glazing?

No. Double hung windows are double-pane only (3/4″ sealed unit) on both Classic and Ultraslim Series platforms. The balance system and sash geometry are designed around double-pane sash weight, and triple-pane is not supported in hung configurations. For triple-pane performance requirements, casement or awning windows are the appropriate choice.

What is the interlocking meeting rail and why does it matter?

The meeting rail is the horizontal bar where the bottom sash’s top edge meets the top sash’s bottom edge. On Window Force hung windows, these rails interlock — they engage each other at the overlap, and the cam lock draws them together to create a seal at the mid-point of the window. Without interlocking rails, the meeting rail junction is a gap that allows air and moisture infiltration even when the lock is set.

Are double hung windows a good choice for heritage and traditional home styles?

Yes. The vertical sash-and-rail layout of double hung windows is historically consistent with colonial, craftsman, Georgian, Victorian, and similar traditional home styles. The divided-lite appearance created by grilles can be customized to match existing windows in a home or match architectural drawings for a new build. Window Force offers a range of grill profiles including colonial, prairie, and heritage patterns.

Where does Window Force supply double hung windows in Canada?

Double hung windows are manufactured at our 80,000 sq ft facility in Vaughan, Ontario, and supplied to dealers and projects nationally, including markets in Halifax, Moncton, Montréal, Québec City, Winnipeg, Regina, Saskatoon, Red Deer, Kelowna, and Victoria.

Double Hung Windows

KeyFeatures

How It Works

Where It Works Best

Series Availability

Frame & Structural Design

Locking System

Cam Lock at Meeting Rail

Dual Tilt-In Sash Design

Integrated Dual Balance System

Hardware Components

Glazing Options

LoĒ-180

LoĒ-272

LoĒ-366

LoĒ-i89

Neat+

Privacy

Safety

Spacer

Configurations

Colour Options

Glass Options

Jambs, Casing, Brickmoulds

Grills Options

Energy Performance

Certified Performance Data

Size Limitations

Warranty Coverage

Covered:

Not Covered:

Frequently Asked Questions

How does a double hung window differ from a single hung window?

What is the ventilation advantage of opening both sashes at once?

Can both sashes be cleaned from inside the building?

Are double hung windows available in triple-pane glazing?

What is the interlocking meeting rail and why does it matter?

Are double hung windows a good choice for heritage and traditional home styles?

Where does Window Force supply double hung windows in Canada?

More Window Styles

How to Order

Key
Features