Learn About Windows (2025)

The term "high-performance windows" is frequently used in construction and renovation projects, but its specific meaning can vary. There is no universal definition, as what constitutes high performance depends on various factors such as climate, housing type, and solar orientation. Manufacturers often define "high performance" based on their own product capabilities. Windows are an integral part of a building's overall enclosure, and their energy efficiency must be considered within a holistic approach, alongside insulation and HVAC systems. Several factors contribute to a window's performance, with the glazing being particularly important due to its large surface area. Insulating glass units (IGUs) offer a wide range of options, from simple double-pane clear glass to multi-pane assemblies featuring low-emissivity coatings and gas fills. The window frame, spacers between glass panes, and hardware that ensures an airtight seal also play crucial roles. The National Fenestration Rating Council (NFRC), a non-profit organization, provides performance ratings for windows through a voluntary certification program, which is often a prerequisite for Energy Star qualification. NFRC labels provide four key performance metrics. The U-factor, ranging from 0.2 to 1.2, measures the window's resistance to heat flow; a lower U-factor indicates better thermal efficiency. The Solar Heat Gain Coefficient (SHGC), between 0 and 1, quantifies the amount of solar heat that enters the building; lower SHGC values are desirable in cooling climates, while higher values can be beneficial for passive solar heating in colder regions. Visible Transmittance, also between 0 and 1, indicates the amount of visible light passing through the glass. Air Leakage certifies that the window allows minimal air infiltration. For energy efficiency, the U-factor and SHGC are the most significant metrics. Energy Star, a program by the Department of Environmental Protection, establishes minimum performance requirements for windows based on climate zones across the United States. These requirements vary significantly between regions, such as the Deep South and northern climates. Energy Star also offers a "Most Efficient" classification for windows that surpass standard minimums. The International Residential Code (IRC) and the Passive House Institute U.S. (PHIUS) also provide their own performance recommendations, with PHIUS standards being significantly more stringent than conventional construction codes. Window manufacturers offer various glazing options, including double-pane, triple-pane, and even quad-pane units, some incorporating suspended plastic films to enhance insulation. In colder climates, the choice between double and triple-pane windows is influenced by the amount of glass in exterior walls and the windows' orientation. Triple-pane units generally offer nearly double the insulating value of double-pane units, contributing to better thermal performance and occupant comfort by reducing radiant heat loss. Strategic selection of windows, particularly for south-facing orientations, can balance high insulating values with optimal solar heat gain. European tilt-turn windows are another high-performance option, particularly favored in Passive Houses and superinsulated buildings. These windows, common in Europe but less so in the U.S., offer versatile operation (casement-style opening or top-tilting hopper function) and are known for their robust construction and multi-point locking systems, which ensure excellent airtightness. While European windows often come with longer lead times and higher costs, they are lauded for their focus on performance and durability, often built to last the lifetime of the house. However, direct comparison between European and NFRC ratings can be challenging due to differing simulation conditions and standards. The decision to invest in high-performance windows involves considering the initial cost versus long-term energy savings, occupant comfort, and condensation resistance, which can be estimated using online calculators like those provided by the Efficient Windows Collaborative. While the economic payback period for high-end windows in net-zero homes can be very long due to already minimal heating loads, for conventional homes, the energy savings are more substantial and economically favorable. Builders and designers emphasize that a high-performance window should exceed building code U-factor requirements and maintain superior airtightness, with specific performance targets varying by climate zone and project needs. #HighPerformanceWindows #WindowEfficiency #EnergyStar #NFRCRating #UFactor #SHGC #TriplePaneWindows #PassiveHouse #BuildingCodes #HomeRenovation

The appearance and ambiance of a home can be significantly influenced by its window treatments. Interior designers have identified eight key window treatment trends that are expected to dominate in 2025, moving away from outdated styles. Cafe curtains, often seen in kitchens and bathrooms, are making a strong comeback. Rachel Alcorn, founder of Two Hands Interiors, highlights their functionality and ability to add softness, particularly appreciating a pinch pleat profile in attractive fabrics. Ripple fold drapery is another trend Alcorn foresees continuing into the new year. This style, featuring a drapery rod without rings and a ripple fold profile, offers a simplified softness to a room. Layering window treatments, though not new, is gaining momentum. Alcorn notes that layering drapery panels over sheers or woven shades provides enhanced functionality. This approach also allows for creative design opportunities, such as pairing a patterned fabric over a sheer, which can complement a room's existing decor without overwhelming it. An emerging trend for 2025 is the use of curtains to drape entire walls, not just windows. Dijana Savic-Jambert, co-founder of Maredi Design, suggests that full walls with windows will seamlessly disappear behind elegant fabrics hung from the ceiling. Integrated track systems hidden within the ceiling are considered ideal for this design, applicable across various rooms like bedrooms and living spaces. Motorization in window treatments is set to become more prevalent. Alcorn explains that homeowners are increasingly seeking shades that can be controlled remotely via apps. This technology is beneficial for hard-to-reach windows, such as those above banquettes, behind sofas, or in two-story rooms, providing convenience and accessibility. Sheer fabrics are also gaining favor among designers. Colleen Simonds, founder of Colleen Simonds Interior Design, is enthusiastic about using lightweight, printed, or patterned sheer window coverings. She emphasizes that these don't need to be overly ornate and can offer a simpler, elegant look. For those who prefer a less dramatic approach than wall-draped curtains, fitted shades installed within the window frame are a growing trend. Savic-Jambert points out that this style is particularly effective in older homes, as it allows the intricate details of trim, millwork, and molding to remain visible. These fitted shades often come with modern technological features, such as motorization and USB-chargeable controllers, contributing to the demand for smart home solutions. Finally, shutters are being re-evaluated for interior use. Simonds advocates for their simple and streamlined aesthetic, noting that they are easier to clean than fabric treatments and can adapt to various design styles. Shutters are no longer confined to a country cottage look and can be styled to appear contemporary in suitable settings, demonstrating their versatility in modern home design. #WindowTreatmentTrends #InteriorDesign #HomeDecor #CafeCurtains #RippleFoldDrapery #LayeredCurtains #MotorizedShades #SheerFabrics #FittedShades #Shutters

In 2026, home decor is moving away from minimalist styles, with homeowners seeking to incorporate more flair into their design choices. Window treatments, often overlooked, are emerging as a key area for this shift, transforming from purely functional elements into significant contributors to a room's overall aesthetic. The defining trend for the upcoming year is layered window treatments, a concept that allows for greater creativity and depth in home design. Erica Flynn, an executive from Graber, highlights the appeal of this trend, noting that the combination of sheers, shades, and drapery will become prevalent, adding comfort and dimension to spaces. This layered approach is reintroducing character and depth into home design, whether as part of a major renovation or a simple refresh. The move away from minimalism encourages designers and homeowners to explore depth in window decor, leveraging patterns, forms, materials, colors, and textures. An interesting combination involves pairing sheer cafe curtains, traditionally used in kitchens, with Roman shades. This pairing creates a dynamic contrast between the shades' sturdy, tailored appearance and the curtains' more cottage-like, flowy, and feminine aesthetic. Roman shades can adorn the top half of the window, providing a canvas for color or pattern, while cafe curtains can ornament the bottom with a vintage charm. This unique layering not only adds visual interest but also enhances functionality, allowing cafe curtains to be used beyond the kitchen by providing privacy through the shades. For a more rustic aesthetic, cafe curtains can be replaced with half shutters, which contribute to the architectural nuances of a room with their built-in look. The interplay between wood and fabric materials in this combination further enriches visual interest and depth. To achieve even greater dimension, drapes can be added as a third layer. Long drapes can create the illusion of taller ceilings or larger windows and can soften the rigid lines of shutters and shades. Cornices or valances can serve as a fourth layer, offering another opportunity to integrate color and pattern while concealing curtain rods and hardware for a clean finish. When implementing layered window treatments, balance is crucial to prevent the window from becoming overwhelming. For combinations involving shades and cafe curtains, lightweight fabrics like linen or cotton are recommended to maintain a fresh and airy feel. A third drape layer can introduce heavier fabrics such as velvet, providing material contrast, enhanced privacy, and light control. Modern valances also tend to favor natural textiles over heavy fabrics. By carefully balancing layers, homeowners can effectively incorporate color blocking, pattern mixing, and print drenching without overpowering the room. The trend also allows for the integration of other contemporary design elements. Upholstered cornices, statement drapes, natural woven shades, mix-and-match patterns, fringed curtains, and brass hardware are all prominent in interior design for 2026. For a bold look, patterns can be deliberately clashed, such as combining floral Roman shades with striped drapes, or tied together with a consistent color palette. For a more subtle yet impactful style, the base layers of shades or cafe curtains can be kept neutral, with patterns carried onto the cornice and drapes. Ensuring that all complementary layers align with a specific aesthetic or color scheme is key to achieving a cohesive design. These versatile layering techniques can be applied to various window types, from bay windows to bedrooms, offering endless possibilities to create a desired statement or functional style. #WindowTreatmentTrends #LayeredWindowTreatments #HomeDecor2026 #InteriorDesignTrends #CurtainsAndBlinds #HomeStyling #DesignInnovation #MaximalistDecor #WindowFashion

The drive for energy conservation, stemming from the oil embargoes of 1973 and 1979, continues to influence American housing construction. While initial efforts focused on insulation and draft resistance in walls, builders and designers are now concentrating on windows as the next area for significant improvement. Walls in new houses typically have R-values (resistance to heat flow) higher than 12, with some cold states exceeding R-15, which is more than a third higher than early 1970s norms. In stark contrast, a single-glazed window has an R-value of approximately 1, making it a major point of heat and cold transfer. Adding storm windows or switching to insulating glass (two panes with a sealed air space) only modestly increases the R-value to about 2. Triple-layer insulating glass can reach an R-value of 3 but is often impractical due to added weight, bulkiness, and a 1/6th reduction in light and warmth transmission per added layer of glass, alongside higher costs. A current high-tech solution involves windows incorporating more than just glass. These advanced windows offer superior insulation, keeping indoor surfaces near room temperature, which prevents condensation and allows occupants to sit by windows without feeling cold. One innovation, SunGain, developed by 3M Company in 1981, uses thin polyester films suspended between two sheets of glass. Two such films create three separate dead-air pockets, forming a “quadpane” system with a winter R-value of 3.8, almost double that of standard insulating glass. Another advanced film, Heat Mirror, from Southwall Technologies (1981), includes a metal oxide layer that reflects warmth. It allows sunlight and near-infrared radiation to pass through but bounces back radiant energy generated by a furnace or objects within the house, achieving an R-value of 4.3. Heat Mirror enabled the creation of "low-E" windows, which have low emissivity, meaning they transmit less long-wave radiant energy than ordinary windows. While a drawback is a noticeable reduction in solar warmth entering through south-facing windows in winter, the radiant energy retained within the house often compensates. In hot climates like Miami and Phoenix, blocking solar heat is beneficial. Southwall later introduced Heat Mirror 66 for southern and southwestern markets, which blocks even more solar heat while maintaining ample light. Energy-conscious builders initially adopted film systems like Heat Mirror but have since shifted to low-E coatings applied directly to glass. These coatings can be a single layer or a triple layer (a metal core like silver for reflection, flanked by anti-reflective materials). Although most low-E coatings can impart a faint blue or gray tint, they are easier for window-makers to work with. PPG Industries introduced Sungate 100 in 1983, a sputter-coated glass, which Deck House adopted. Sputter-coated glass, where materials are vacuum-deposited, achieves an R-value of about 3, equivalent to triple glazing, without the added thickness or weight. This coating must face the sealed air space as it can be damaged by touch or moisture. A newer method involves spraying a coating onto hot glass, creating a hard, baked-on surface. "Hard-coat" low-E glass is impervious to moisture and can be exposed to the atmosphere and normal handling, making it convenient for manufacturers. However, only certain hard-coat products, like Glaverbel's Comfort, claim energy efficiency comparable to sputter-coats, though generally less than Heat Mirror or 3M films. Until hard-coat products are upgraded, sputter-coat glass or film systems like Heat Mirror or 3M are generally more effective for homeowners. Hard-coat low-E glass is a good choice for storm windows, as they are not fully sealed. The article suggests hard-coat glass for east, west, and north-facing storm windows in cold, sunny climates but not for south-facing windows due to solar warmth loss. Annual production of low-E glass in the U.S. is projected to reach 125 million square feet by 1988. Further advancements include filling the air space in low-E windows with argon, an invisible inert gas. Argon's large, heavy molecules conduct heat less readily than air. The SNE Corporation claims its argon-filled sputter-coat low-E systems (Crestline and Vetter) can achieve R-values as high as 5. For even better energy performance, insulating shutters and blinds, known as movable insulation, were once considered promising, with R-values up to 15. However, this field has faced mechanical issues, such as shades falling out of tracks or condensation forming. Daily effort from homeowners to deploy and remove them is also a deterrent. Additionally, the lack of marketing and distribution power compared to major glass manufacturers has hindered the adoption of movable insulation. Low-E windows also block most ultraviolet rays, preventing fading of carpets and draperies. When purchasing, customers should inquire about the R-value (or U-value) of the glass and the entire window assembly, as frame conduction and air leakage can negate glass improvements. Manufacturers like Andersen and Pella have improved window designs for better insulation and ease of cleaning. For instance, Marvin and Andersen offer double-hung windows with pivoting sashes for easier cleaning. Rolscreen produces casement windows that pivot into the center for better cleaning and ventilation. Rolscreen also offers Slimshades, thin Venetian blinds with low-E coating installed between glass panes, achieving an R-value of 4.35. Ornamental windows, including round-arched and stained-glass designs, are a prominent trend. Many new stained-glass windows are insulated. The era of the large picture window is evolving, with many now camouflaged by dividers imitating muntins to create the appearance of multiple small panes. These false muntins, often made of snap-in grilles, are criticized for their unconvincing appearance. More effective solutions include wooden grilles placed between glass panes (Rolscreen) or on the room side or exterior (Woodstone). Peachtree introduced a removable solid-pine liner with muntin bars and a part of the surrounding sash that can be lifted off for cleaning. While clever, this is viewed as an ornamental rather than a functional improvement. For truly authentic divided lights with insulating glass, Marvin and other companies offer custom orders, though these are more expensive and the larger muntins needed for insulating glass can affect the aesthetic proportions. Many who value historical styling opt for single-glazed, multi-light windows with storm windows. While hard-coat low-E glass can be ordered for true divided lights, these still fall short of maximum energy conservation. The article concludes that technology and tradition in home design are yet to be fully reconciled. #EnergyConservation #WindowTechnology #HomeImprovement #LowEWindows #BuildingMaterials #SustainableDesign #ArchitecturalTrends #InsulatingGlass #BuildingCodes

Climate change is leading to an increase in the frequency and intensity of weather-related disasters, including wildfires, droughts, and flooding. These events are causing significant financial damage to homes, while insurance companies are simultaneously raising premiums and reducing coverage. This context has elevated the importance of building resilient, or hardened, homes, making it a prominent design trend for 2025. Resilient home construction involves using durable materials capable of withstanding extreme weather and facilitating easier repairs after a disaster. A key starting point for enhancing home resilience is renovating windows to ensure they can endure harsh elements. For regions prone to wildfires, dual-pane windows made of tempered glass are recommended, as they are four times more resistant to cracking or breaking under high temperatures. The addition of window screens can further reduce heat exposure to the glass and prevent embers from entering the home. In areas susceptible to hurricanes and storms, impact-resistant windows, designed to withstand flying debris, are a crucial choice. Applying window film or laminate can reinforce the glass, and maintaining well-sealed frames is essential to prevent water infiltration. While the initial cost of replacing windows can be substantial, it is presented as a worthwhile investment for the future. Beyond reducing the risk of damage and costly repairs, resilient upgrades offer daily benefits. For instance, hardened windows contribute to climate control, improving energy efficiency and lowering utility bills. However, resilience extends beyond specialized windows. The U.S. Department of Housing and Urban Development's "Designing for Natural Hazards" guide provides comprehensive tips for various natural disasters. Key recommendations from the guide include making homes more fireproof by installing ember-resistant vents, replacing flammable siding, and opting for roofs made of metal, clay, or tile. For flood-prone areas, installing flood-resistant insulation can be critical. Even drought, often underestimated in its severity, poses significant risks. Prolonged dry conditions can cause foundations to crack and sewer lines to shift. Implementing systems to maintain ground moisture around the foundation can mitigate these potential hazards, protecting the home's structural integrity. These measures collectively aim to safeguard homes against the increasing threats posed by climate change. #WindowTreatmentTrends #HomeResilience #ClimateChangeImpact #SustainableHomeDesign #WeatherProofing #HomeImprovement #DisasterPreparedness #EnergyEfficiency #PropertyInvestment