What is the difference between a single hung and a double hung window?

In a single hung window, only the bottom sash slides — the top sash is fixed. In a double hung window, both sashes move vertically and both tilt inward for cleaning. Single hung windows are simpler and generally less expensive; double hung windows offer more ventilation control, since you can open the top sash, the bottom sash, or both at the same time.

Can I clean the exterior glass on a single hung window from inside?

Yes. The bottom sash on Window Force single hung windows tilts inward on a pivot mechanism, rotating into the room so you can reach and clean the exterior glass surface from inside the building. The tilt function disengages the balance cartridges temporarily and re-engages when the sash is returned upright.

Is triple-pane glazing available for single hung windows?

No. Single and double hung windows on the Classic Series platform use a 3/4″ sealed insulating glass unit and are available in double-pane only. The frame geometry and balance system are calibrated for double-pane sash weight. If triple-pane performance is a requirement, casement or awning configurations support both double and triple glazing.

Why is the meeting rail important in a single hung window?

The meeting rail is where the top and bottom sashes overlap at the mid-height of the window. On Window Force hung windows, interlocking meeting rails interlock and pull the two sashes together when the cam lock engages, creating a tight seal at the most common air leakage point in a vertically sliding window. The flush bolt system adds a secondary fastening point for additional security.

What balance system do Window Force single hung windows use?

Window Force hung windows use integrated spring-loaded balance cartridges in each jamb channel. The cartridges counterbalance the weight of the bottom sash so it can be held open at any height with minimal effort. Balance cartridges are weight-calibrated to the specific sash at manufacture, which is why a sash that has been re-glazed or modified sometimes requires recalibration.

How do single hung windows compare to sliders for a basement or compact space?

Both types move within the frame plane and require no exterior clearance, making them suitable for tight spaces or openings above grade. A single hung window provides a taller ventilation opening relative to the frame size (the full bottom-sash height), while a single slider provides a wider opening. Sliders are typically preferred in wide, low openings such as basement windows; hung windows suit narrow, taller openings better.

Where does Window Force supply single hung windows?

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

The reduced number of moving parts translates directly into greater reliability, consistent performance, and a significant reduction in required maintenance

Delivering dependable airflow and robust construction through a smoothly operating bottom sash

Single-hung windows are built on the Classic 3 1/4" and Ultraslim 2 7/8" platforms

Single Hung Windows

A single hung window has two sashes arranged vertically, with the bottom sash designed to slide up and the top sash fixed in place. Sliding the bottom sash upward creates an opening from the bottom of the frame, and the sash tilts inward for exterior glass cleaning from inside the building. Window Force single hung windows are built on the Classic 3 1/4" and Ultraslim 2 7/8" platforms in lead-free uPVC with fusion-welded corners, an integrated balance system, and interlocking meeting rails.

Bottom operable sash

Fixed top sash

Sealed unit

Internal chambers

uPVC material

Jamb extensions

Fusion welded corners

Inside trim

Outside vinyl brickmoulds

Traditional
aesthetic

Easy-to-operate
lower sash

Secure locking
mechanisms

Noise-reducing
construction

Key
Features

Vertically sliding bottom sash, fixed top sash

Tilt-in sash design for interior and exterior glass cleaning

Integrated balance system for smooth sash travel

Interlocking meeting rails for a tight mid-point seal

Cam lock engagement hardware

Optional flush bolt system

Multi-chamber lead-free uPVC frame

Fusion-welded corners including interior walls

Double-glazed only — 3/4″ sealed unit

Optional interior removable screen

How It Works

The single hung window operates on a vertical axis: the bottom sash slides upward along channels in the frame, held in position by an integrated spring balance system calibrated to the weight of the sash. When the bottom sash is raised, it creates an opening at the base of the window. The cam lock hardware at the meeting rail keeps the sash sealed when closed. To clean the exterior glass, the bottom sash tilts inward on a pivot mechanism, rotating into the room and giving access to the outer glass surface without going outside.

Where It Works Best

Single hung windows are a practical choice in spaces where horizontal clearance is limited — the sash moves entirely within the frame plane and requires no exterior clearance. They suit traditional and colonial home styles, bedrooms, and living spaces where a balanced sash layout is preferred. Because only the bottom sash moves, the fixed upper sash provides structural stability and predictable sightlines, which makes the single hung a consistent choice in multi-unit residential buildings and homes where a uniform window appearance is important.

Series Availability

Ultraslim Series

Reduced visible profile (2 7/8″) 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

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.

Multi-chamber vinyl frame with vertical sash channel geometry designed for smooth sliding operation under load

Welded corner construction including interior walls — no adhesives or sealants

Flush bolt hardware option for additional security at the meeting rail

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

Integrated balance system calibrated to sash weight to hold the bottom sash at any open position without sagging.

Interlocking meeting rails provide a tight seal at the sash-to-sash junction when the window is closed.

Locking System

Cam Lock Engagement

A cam lock at the meeting rail provides secure closure and seals the bottom sash against the top sash. The cam mechanism pulls the sashes together as it rotates, creating consistent pressure at the mid-point of the window.

Inward Tilt Mechanism

The bottom sash pivots inward on a tilt mechanism, allowing the exterior glass to be cleaned from inside the building without requiring outdoor access. The sash disengages from the balance system during tilt and re-engages when returned to the vertical position.

Integrated Balance System

Spring-loaded balance cartridges in each jamb channel counterbalance the weight of the bottom sash, allowing it to be raised and held at any position with minimal effort. Balance springs are weight-calibrated to the sash at manufacture.

Hardware Components

Cam lock at the meeting rail for single-point 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 application or building code

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

Energy ratings shown reflect representative configurations. Actual performance values vary depending on glazing package, series selection, and final window configuration.

Technical Specifications

Model	SHT_IS_CLRCARD-ARG90-CARD180#3	SHT_IS_CLRCARD-ARG90-CARD180#3-ARG90-CLRCARD
U-factor, W/(m²·K)	1.72	1.68
Solar Heat Gain (SHGC)	0.53	0.48
Energy Rating	32	30
ENERGY STAR Zones, 2015	1 \| 2	1 \| 2
ENERGY STAR Zones, 2010	ABC	ABC
Layers of Glazing	2	3
NRCan Reference	NR9161-12601997-ES	NR9161-12602001-ES
Energy Efficiency Verification Reference	W535-1	W535-1
U-factor, Btu/(h·ft²·°F)	0.3	0.3
Visible Transmittance	0.61	0.56
Air Leakage — Infiltration, l/(s·m²)	0.53	0.53
Air Leakage — Exfiltration, l/(s·m²)	0.48	0.48

Size Limitations

The table below outlines standard single hung window size limitations for the Canadian market. Maximum dimensions depend on glazing configuration and structural performance requirements.

Pane	Width, min – max	Height, min – max	Max Sq.Ft.
Double Glass	15" – 46"	27" – 66"	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

What are single hung windows and how do they work?

Single hung windows feature a fixed upper sash and a movable lower sash that slides vertically. This design is simple, space-efficient, and ideal for areas where an outward-opening window might interfere with walkways or landscaping. They're commonly used in bathrooms, basements, and bedrooms—anywhere that needs airflow with a streamlined look.

Why are single hung windows popular in Toronto and GTA homes?

Their appeal comes down to practicality and price. Single hung windows are more affordable than other styles, making them a popular choice in budget-conscious renovations or new builds. Their space-saving design works well with Toronto's dense housing layouts, and they're widely available with local service and customization through suppliers like Window Force.

What are the advantages of single hung vinyl windows?

Vinyl single hung windows are built to last with very little upkeep. Their durable frames won't warp, crack, or peel, and you can choose from a variety of finishes to match your style. Window Force offers vinyl options that deliver reliable insulation, smooth operation, and a clean finish that complements most home designs.

How do single hung windows compare to other window styles?

Compared to double hung windows, single hung styles are simpler—with fewer moving parts, they cost less and require less maintenance. Unlike casement windows, they don't open outward, making them safer in tight exterior spaces. And while sliders open side-to-side, single hung windows are better at sealing vertically against drafts. Each has its place — it's about choosing what suits your layout and goals.

How does Window Force ensure top quality in single hung windows?

We follow a strict manufacturing process that includes precision extrusion, corner welding, and sash alignment checks. Each unit is tested for water resistance, air infiltration, and ease of operation. Our products are CSA-certified and built with high-performance hardware to stand up to everyday use in Toronto homes.

What installation factors affect single hung window performance?

Proper sealing and leveling are critical. If the frame isn't square or the sash doesn't sit properly, air leaks and water intrusion can follow. Insulation around the opening, correct flashing, and a tight perimeter seal make all the difference in long-term efficiency and comfort.

Why do dealers choose Window Force for single hung window supply?

Because we make their jobs easier. Our product line is consistent and always in stock, with clear specs and local support. Dealers get competitive margins, marketing materials, and after-sales service that helps build trust with their customers. It's a win on all sides.

Single Hung Windows

KeyFeatures

How It Works

Where It Works Best

Series Availability

Frame & Structural Design

Locking System

Cam Lock Engagement

Inward Tilt Mechanism

Integrated 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

Technical Specifications

Size Limitations

Warranty Coverage

Covered:

Not Covered:

Frequently Asked Questions

What are single hung windows and how do they work?

Why are single hung windows popular in Toronto and GTA homes?

What are the advantages of single hung vinyl windows?

How do single hung windows compare to other window styles?

How does Window Force ensure top quality in single hung windows?

What installation factors affect single hung window performance?

Why do dealers choose Window Force for single hung window supply?

More Window Styles

How to Order

Key
Features