Windows and Doors Resource Centre

Looking for additional information about Window City products? You’ve come to the right place.

Window City products are designed with style, efficiency and convenience. Professional installation and proper maintenance will ensure that they look and work like new for longer.

Check out Window City resources that will assist you with; frequently asked questions, technical specifications, maintenance, terminology, professional resources, and much more. Also, resources for home owners, including our all-new Get Ideas section, which can be found by scrolling below. You can always contact us with any additional questions.


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Resources Dealers and Contractors
Resources Builders and Architects
Dealers and Contractors
Expand your product offering and strengthen your business with quality windows and doors. Window City Dealers and Contractor Programs are designed for the window and door professionals who want a market advantage with products and options unique in the industry.
Builders and Architects
Window City has been the most trusted window and door manufacturer among builders and architects for over 25 years. If you are looking for windows and doors that combine innovative design with superb construction and give you unparalleled performance, then you have come to the right place. Let us help you with design, new construction, remodel and replacement products. Together we can bring your ideas to life.


What are replacement windows?

Unlike a window used in new home construction, a replacement window is a window that is custom built to fit into the opening of an existing window. It’s built to fit that opening precisely and can be installed without disturbing the interior and exterior trim. It can modernize and upgrade the design of the existing window and, in most cases, will provide additional strength and energy efficiency benefits.

Will my vinyl frame windows pay for themselves?

If you chose a high quality, energy efficient window such as the ones available from Window City, your initial investment can be recouped over time, through reduced heating and cooling costs. Numerous airtight construction features and advanced glazing in Window City window units do a much more effective job of sealing cold air out and keeping heated air in.

Why has vinyl become the most popular type of framing?

The technology of vinyl extrusion has advanced significantly over recent years, enabling it to become the material that is most energy efficient and easiest to maintain. Vinyl has proven to be practical as well as beautiful. Window City window and door products are designed and manufactured with optimum efficiency considerations utilizing the latest technology available in the industry today.

What are the advantages of vinyl windows versus wood or metal?

Aside from beauty and design considerations and general architectural preference, the major advantage of vinyl is the cost saving achieved through better energy efficiency. Another important factor is that homeowners never need to paint vinyl window frames, which results in a saving of both money and work.

All vinyl windows look alike, how do I tell the difference?

The major difference between Window City windows and lower quality vinyl windows is in the internal construction of the sash and frame. When looking at different products, ask your dealer to show you the structural components of the window and to explain how the window seals the airflow from inside the home.

What about glazing? Are all LoE coatings the same?

No. There are different Low-e coatings that allow you to customize the glass performance based upon the location of the window in the home. Some coatings prevent more heat from entering, while others allow more heat to enter your home. This gives you the opportunity to control the comfort of each room individually, thus minimizing your energy consumption and lowering your costs. The Window City Solar Solutions glazing options allow you to customize the comfort and performance of each opening, maximizing your investment.

Will vinyl frame window and glass units protect against forced entry?

If security is a concern, there are ways to maximize the security of your windows and doors. With the largest exposure to entry of a window or door being the glass, the latest concept available is laminated glass packs. These are designed to withstand multiple blows with a heavy object and still stay intact. Our Safe Vision glass can withstand 30 to 40 direct hits with a baseball bat and not break out of the frame.

Can vinyl frame window and glass units reduce outside noise?

All windows and doors will reduce outside noise to some degree. If noise reduction is a concern, the best solution is to use Window City’s Safe Vision laminated glass. This will improve the noise reduction by as much as 100% over a standard glass pack.

What is condensation?

Is your glass “sweating” , is ice forming on the inside surface of your windows or doors? The problem is not your new windows, the problem more than likely is excess humidity in your home. Humidity, which consists of warm air borne water vapor, is drawn towards cooler surfaces, such as your windows and doors. Surfaces that are below room temperature are more likely to show condensation.

What causes condensation?

When certain conditions exist, condensation can occur both inside and outside your home. The source of condensation is humidity, or air borne water vapor, which is present in all air. When this water vapor comes in contact with a cooler surface it will condense, similar to your bathroom mirror after you take a hot shower. Condensation can occur on windows and doors during the winter if the humidity level is high enough.

Do windows cause condensation?

No. Windows do not cause condensation; they simply are doing what they are designed to do. By keeping the warm air in your home the windows also stop the humidity from escaping and that humidity becomes visible on the glass.

Do vinyl window systems reduce condensation?

They can help control the problem. Moisture vapor in the air condenses when it comes in contact with a cooler surface. A high quality vinyl window system that incorporates the latest warm edge technology glazing will help to reduce condensation, because it keeps the edges at a more consistent temperature. When you minimize the hot and cold differences of the glass, you reduce the amount of condensation.

What is temporary condensation?

Temporary condensation will not last long and will eventually disappear. Temporary condensation can occur:

• After baths and showers, laundry, cooking or dishwashing.
• At the start of the heating season. Your home can retain moisture from the humid summer months.
• When the outside temperature experiences drastic changes. A sharp drop in temperature, especially during the heating season can cause temporary condensation.
• During construction or renovation of your home. Most building materials retain moisture during shipping or storage; this moisture can be released into the home but will eventually dry out.

What problems are associated with condensation?

Excess moisture in your home can cause not only structural problems but it also presents a health risk as well. Problem condensation will show itself when:

• The condensation remains on the windows throughout the day.
• You can see condensation on the walls
• If you notice a musty smell in your home.
• You notice mold or mildew on various surfaces throughout the home.

Can I reduce condensation?

Yes. There are several ways to reduce the humidity in your home, the three main areas of concern should be:

• Reduce Moisture sources
• Increase ventilation
• Increase indoor air temperature

Should I buy the same windows for every wall opening on my home?

A window with excellent solar gain efficiencies is a real energy saver if it is installed on a south or west facing wall, yet the same window on a north facing wall is not only a waste but can actually lower your energy efficiencies. Our dealer will explain how you can use our various Solar Solution glazing options to effectively customize the comfort of your home room by room, regardless of where you live in North America.

What are Energy Star Efficient Windows?

The Energy Star™ program was developed by the U.S. Department of Energy and the U.S. Environmental Protection Agency to help identify energy-efficient choices for your home. The Energy Star™ seal is only granted to products that demonstrate significant reduction in energy consumption in the home. The majority of WindowCity windows and doors meet or exceed U.S. and Canadian regulations to be considered Energy Star™ compliant. WindowCity is also an Energy Star™ Partner.

What is Thermal Performance?

Not all windows and doors are created equal, Window City being an industry leader is proud to offer a complete range of Solar Solution glass options so homeowners can not only choose the style, function and architectural elements they want but truly maximize the value of their investment by customizing each window in their home for their own comfort levels, thermal performance and energy savings.

The Energy Star™ seal is only granted to products that demonstrate significant reduction in energy consumption in the home. All Window City windows and doors meet or exceed Canadian and U.S. regulations to be considered Energy Star™ compliant plus Window City is also an Energy Star™ Partner

What are Window & Door Energy Star Performance Ratings?

The Energy Star™ program was developed by the U.S. Department of Energy and the U.S. Environmental Protection Agency to help identify energy-efficient choices for your home. The Energy Star™ seal is only granted to products that demonstrate significant reduction in energy consumption in the home. The majority of Window City windows and doors meet or exceed U.S. and Canadian regulations to be considered Energy Star™ compliant. Window City is also an Energy Star™ Partner.

How Do I Authenticate my Window City Product?

To make absolutely sure that the windows you have purchased are in fact a Window City product, look for our Company Name & Logo Website Address Order# Line Item# and Unit # printed clearly on the white, warm-edge spacer between the panes of glass. All of our products will have this identification included. This is your guarantee that you are getting the best and that your windows will perform to our stringent, industry leading standards. Best of all, they are covered by our Non-Prorated Lifetime Warranty.

How do I Maintain my Windows & Doors?

Please refer to our Maintenance section

Have a question not listed above? Contact us.



Air Infiltration/Air Tightness

This test measures air infiltration through a window or door, excluding air, which passes between the frame of the unit and the wall. The units are tested as specified in AAMA/WDMA/CSA 101/I.S.2/A440-S1-09.

Awning Window

A window with a sash that is hinged at the top and opens from the bottom.

Bay Window

A bay window is made up of three or more windows. The side or flanker units project out from the building in 30°, 45°, or 90° angles. The center is parallel with the building wall and is made up of one or more windows. All the units can be stationary, operating, or any combination of the two. Typically, the center section is stationary, while the side units are operating.

Bow Window

A series of four or more adjoining window units, commonly five in number that project 10°-20° from the wall of the building, forming a radius.


A form of exterior casing for windows and doors that serves as an aesthetic boundary between the siding and the frame.

Cam Lock

A single-point locking mechanism that uses a “cam” action to lock and pull the window sash against the frame, forming a tight weather seal. Large windows may have more than one cam lock.

Cam Pivot (also known as “pivot pin” or “torx pin”)

The pins on the bottom corners of single and double-hung sashes that engage the balance and also allow the sash to “pivot” for easy removal and reinstallation.

Casement Window

A window that opens from the side like a door. Historically, casements were the first working windows. They were strategically placed throughout a house to capture breezes and direct them through the rooms. Screens are hung internally to prevent bugs and dirt from entering the house.


The trim around door and window openings. Interior casing is shaped, decorative molding that covers the inside edges of the jambs and the rough opening between the window unit and the wall. Exterior casing is an alternative to brickmold.

Divided Lite

A window opening divided into smaller sections by a grid system on the interior or exterior of the glass, between the glass panes, or any combination of these three.

Door Casing

The trim around an interior or exterior door. Exterior door casings are installed only on the outside of exterior door frames, especially on wood facing wood-frame exterior walls. Interior casing covers the inside edges of the jambs and the rough opening between the door unit and the wall.

Door Frame

The assembly of structural members (head, sill, jambs) used to fasten the door system to the structure.

Door Jamb

The upper horizontal and two vertical frame members that house the door panel. Jambs may be classified as head or side jambs.

Door Panel

An assembly comprised of stiles (vertical pieces), and rails (horizontal pieces) inserted into the door frame.

Double Glazing

Two panes of glass separated by an air space to form insulating glass. Double glazing may also be accomplished by adding a storm panel.

Double-Hung Window

A window with two sashes, upper and lower, that slide vertically past each other.

Dual-Arm Operator

A window-opening mechanism used on casement windows. It is composed of two arms; one pulls the sash while the other pushes.

Entrance Door

A door that serves as the main entrance of a structure. It may be single or paired.


A form produced by forcing material through a die.

Finger Joint

A joint between two pieces created by machining a series of interlocking groves. It is used to create a longer section of wood. The joints are firmly held in place with an adhesive.


The final, protective treatment of a surface (paint, stain, etc.).


Refers to a window or door that is non-venting or inoperable.

Flat Door Panel

A door panel consisting of a flat piece of plywood, solid wood or other material in contrast to a raised door panel

Flush Door

A door consisting of a core, cross-banding and flat-face veneers, or a door consisting of a core and flat-face veneers only.

French Door

A style of door in which two panels open to provide a clear opening which is approximately twice as wide as one panel. In the 19th century, glass was added to door construction, mainly in French and German homes, on internal doors leading to rooms containing more natural light, such as conservatories, glass houses and vestibules.

Geometric Window

Specialty windows of various shapes including: rectangles, triangles, trapezoids, octagons, pentagons, half-rounds, quarter-rounds, full rounds, sectors and ellipses.

Glass Stop

The trim that covers the edge of the glass.


The process of mounting glass into windows and doors. Glazing also refers to the lowest quality of plate glass. The purpose of glazing is to retain the glass adequately under the design load, provide an effective weather seal, prevent loads or pressure points on the glass resulting from building movement, prevent glass-to-metal contact, and minimize glass breakage from mechanical or thermal stress. An insulating glass (IG) unit is two glass panes separated by a spacer and sealed. IG glass is offered in clear (no special coating) and high performance, which has a special low-emissive coating for exceptional energy efficiency.


A decorative grid on the interior or exterior of the glass, between the glass panes, or in any combination of these locations that divides a window opening into smaller openings to create a simulated divided lite or true divided lite. Grilles may or may not be removable.


A term describing the swinging direction of a window or door. Window or door hardware may also be left or right-handed.

Head Jamb

The horizontal frame member at the top of a window or door assembly.

Header Track

The track in the head jamb of a sliding/gliding window or door that guides the sash/panel as it opens and closes


A jointed or flexible device on which a door or window turns. The earliest known hinges were T-shaped devices called strap or cross-garnet hinges. They were made of wrought iron with a crossbar fixed vertically to the door frame, and attached with nails to the door. In the 18th century, hinges for interior doors were H-shaped or L-shaped, and attached to the door with nails.

Insulating Glass Unit

A sealed assembly of two or more panes of glass separated by a spacer. Manufacturing of insulating glass began in 1930.

Horizontal Sliding Window

Two or more sashes that slide horizontally past each other. One or more of the sashes may be fixed or inoperative or all the sashes may operate. In a closed position, the sash come together to form a vertical meeting rail.


The vertical frame members of a window or door assembly.

Kick Plate

A thin, polished metal plate applied to the bottom rail or bottom of a door to prevent denting and soiling of the wood surface caused by the kicking action of persons opening the door; kick plates may be applied to one or both sides of a door.


Lite (also Light)

A framed opening in the glass within a sash or door panel; frequently used in reference to glass divided by a grid into multiple smaller openings.

LoE2 (“Low-E Squared”) Glass

Window City uses LoE2, which provides the best clarity and highest performance of all solar gain Low-E glass products. Ordinary Low-E provides 14% air-conditioning savings when compared to single pane clear glass, whereas LoE² provides 31%. The end result is windows that provide the ultimate in comfort, because they reduce window heat gain by 50% or more when compared to ordinary glass.

Low-Emissive (Low-E) Glass

Low-E glass is manufactured by depositing a microscopically thin, transparent metal or metallic oxide layer on the glass. Low-E coatings reduce radiant heat loss, and can reduce the passage of UV rays. Use of heat-resistant (or absorbing) glass began in the 1950s, as did the use of reflective (or mirror) glass.


A strip of wood, usually shaped to a curved profile, used to accent and emphasize the ornamentation of a structure and to conceal surface or angle joints.


A wood or metal part used to structurally join two window or door units.


The individual pieces of a decorative grid that help divide a window opening into smaller sections.

National Fenestration Rating Council (NFRC)

The NFRC is an independent third-party certification organization with industry-accepted standards for evaluating and certifying energy performance. The NFRC Certificate contains U-factor, SHGC (Solar Heat Gain Coefficient), and VT (Visible Transmittance) values. These values form the basis for the ENERGY STAR® Door and Window Program.


The hardware mechanism used to open and close a window, excluding the hinges.

Operating Sash

An assembly comprised of stiles (vertical pieces), rails (horizontal pieces), and a window’s glass that opens and closes.


A framed sheet of glass within a window or door frame.

Patio Door

A mainly glass door that opens onto a patio, deck or backyard of a house. The door panel is comprised of stiles, rails and glass to allow for viewing. Originally homeowners asked for glass doors from a glazer, or someone who handles glass. This specialty product was created by distributors in small shops. In the 1960s, when aluminum sliding doors became very popular, window manufacturers realized they could make patio doors to fill the openings that used to be filled by solid doors. At that point, the window companies started heavily promoting patio doors, made in aluminum, vinyl and wood. Door companies now also make them in wood, composites and steel.

Picture Window

A fixed window, typically of a large size in relation to adjacent windows.

Pivot Pins

The pins on the bottom corners of single or double-hung sashes that engage the balance and also allow the sash to pivot for easy removal and installation.

Rough Opening

The pins on the bottom corners of single or double-hung sashes that engage the balance and also allow the sash to pivot for easy removal and installation.


This refers to the resistance a window has to thermal transfer or heat flow. The higher the value, the better the insulation.


An assembly of stiles and rails that forms a frame for holding the glass in a window.

Sash Lift

A handle built into, or attached to, the rail of the sash on a double-hung or single-hung window for easy opening.

Sash Track

The track on the sill of a sliding or gliding window that guides the sash as it opens and closes.

Sidelite (Light)

A fixed, usually rectangular, window placed on either side of a door.


A main horizontal member forming the bottom of the frame of a window or door.

Sill Track

The track on the sill of a sliding or gliding window or door that guides the sash or panel as it opens and closes.

Single Glazing

The use of a single pane of glass in a window.

Single-Hung Window

A window with a fixed upper sash and movable lower sash that slides vertically.

Sliding Patio Door

A door with one or more panels that slide horizontally.


The vertical frame members of a sash, door, blind or screen.

Solar Heat Gain Coefficient (SHGC)

Solar heat gain coefficient is a measurement of the amount of solar radiation through a piece of glass or door material. The lower the SHGC, the fewer UV rays that cause heat gain come through the glass.


A component that separates the panes of glass to create the airspace in an insulating glass (IG) unit.

Tempered Glass

Glass that is treated with heat in its manufacturing, creating a product that can withstand abnormal force or pressure on its surface, and does not break into sharp pieces. Building code requires tempered glass in all doors (including patio doors), and in windows that are located near doors, bathtubs or showers.

Tilt Window

A double-hung window designed in such a way that the sashes tilt inward for easy cleaning of the outside of the glass.


A window, usually rectangular, placed over a door or window. Transoms, or fanlites, were first used in the 18th century on exterior doors. They increased the amount of light let into the front hall and, because of them, the size of the front door could be reduced.

Triple Glazing

Three panes of glass with an air space between each pane.

True Divided Lite

A window opening comprised of multiple individual smaller panes of glass separated by muntins.


U-factor or U-value is a number that represents the rate of heat loss through a window or door. The lower the number, the greater a window resists the transfer of heat. A U-factor of 0.35 or lower represents good insulating value.

Visible Transmittance (VT)

Visible transmittance (VT) describes how much available light comes through a window, and is expressed as a percentage. The higher the VT, the more daylight a product lets in. A good VT is about 55%.

Warm-edge Spacer

A spacer designed to minimize heat transference between two layers of insulating glass.


Variously shaped metal, vinyl, plastic or molded fiber strips that fit tightly against the window or door frame parts to prevent air infiltration through cracks. Cold air entering the house in winter can account for up to 35% of the heating load. Weatherstripping can reduce the load to 20%.

Window Casing

May be interior or exterior; an exterior window casing is most commonly installed on window frames for wood sided exterior walls.

Window Frame

A group of uPVC parts machined and assembled to form an enclosure and support for a sash.

Window Jamb

The upper horizontal and vertical frame members that house the window sash. Jambs may be classified as head or side jambs.

Window Unit

A combination of the frame, sash, weatherstripping, sash opening mechanism and, at the option of the manufacturer, screens and/or storm sashes assembled as a complete and properly operating unit.


Classic Collection

WC-100 Casement

WC-125 Awning

WC-150 Slim Fixed

WC-175 Fixed Casement

WC-200 Single Slider

WC-201 Single Hung

WC-251 Double Hung

WC-250 Double Slider

WC-300 Single Slider

WC-325 Single Slider

WC-350 Double Slider

WC-425 Awning

WC-450 Slim Fixed

WC-475 Fixed Casement

WC-400 Casement

Heritage Collection

HC-101 Casement

HC-126 Awning

HC-151 Slim Fixed

HC-176 Fixed Casement

Heritage Maximum Collection

HC-401 Casement

HC-426 Awning

HC-451 Slim Fixed

HC-476 Fixed Casement

Patio Door Collection

Ultra Patio Door Sliding & In-Swing


These window and doors installation videos will help you to understand the steps to properly install your products.

Windows Installation Videos