Window Style In terms of operable windows, hinged-sash windows such as casement and awning windows are typically the most energy efficient as they create a firm weathertight seal when closed.
Insulated cellular shades are typically considered to have the highest R-values of all window coverings. The air pockets in the honeycomb cross-sections act as insulators, increasing the R-value and reducing the conduction of heat through the window.
Double-Pane and Triple-Pane Windows
Such gases are denser than air, so they provide more effective insulation and better window energy saving.
Windows with high R values include double-glazed windows, triple-glazed windows, and argon-filled windows. Double-glazed windows have two layers of glass with a space in between, while triple-glazed windows have three layers of glass.
Vinyl Windows: The Energy-Efficient Choice
Vinyl windows are a popular choice for warm weather climates due to their excellent energy efficiency and low maintenance requirements. Made from PVC (polyvinyl chloride), these windows are designed to reduce heat transfer, keeping your home cooler in the summer.
The most energy efficient windows are triple-pane windows, known for their superior insulation. These windows are followed by double pane and then single pane options in terms of efficiency.
The most energy efficient type of glass for double and triple glazing is low emissivity (low-E) glass. Low-E glass has a microscopically thin coating of metal oxide on one of the internal glass surfaces.
On average, double-pane windows have an R-value of 3-3.7, while triple-pane windows have an R-value of anywhere between 5-8.
ENERGY STAR®
For over 100 years, Andersen has built a reputation for environmental stewardship and energy-efficient products. In fact, Andersen has been part of the ENERGY STAR program since it started and was the first window manufacturer to be named an ENERGY STAR National Window Partner of the Year in 1999.
Vinyl. Vinyl window material is often considered to be the gold standard for frames by balancing price, quality, customization options, and maintenance needs. Economical, highly energy-efficient vinyl windows are fire-resistant and low maintenance, and there's no need to paint or stain them if you don't want to.
Advantages of Fiberglass Windows
More Glass, Sleeker Frames: Fiberglass offers superior strength and durability compared to vinyl. This allows for thinner frames and larger glass areas, which means more natural light and a sleeker aesthetic for your home.
Windows with enclosed blinds do have one disadvantage – they aren't as energy efficient as some other styles. Many double-pane windows feature argon gas between the glass, but those with built-in blinds have regular air in this space. The reason for this is to provide easy operation.
North-facing windows experience the least amount of heat gain throughout the day, whereas South-facing windows collect the most heat during the day. East-facing and West-facing windows lose the most amount of heat during winter and can actually gain the most amount of heat in the summer months.
The quick answer to how to pick out an energy-efficient window is to select the more efficient window type — casement, awning, or picture window — the most insulating glass construction (triple-pane glass) and the glass coatings best suited to your climate.
While old windows might still be functional, there's a good chance they're not very efficient. Windows that are over 20 years old should be replaced.
Winter (Off-Season)
Winter may seem like an unlikely time for window replacement. However, window companies often offer special deals and discounts during the off-season. Winter can be a great time to replace your windows and save money.
While it can vary among different manufacturers, most window installers agree fiberglass is the most durable, longest lasting window that can be used in homes. Fiberglass windows won't rust, warp, corrode or rot. Plus they're resistant to harsh weather and are immune to insect damage.
Energy-efficient windows not only help keep your home comfortable all year round, but they can also lower your energy bills, so they're a good investment for many—but they can be costly. Energy-efficient windows cost anywhere from $325 to $2,000 per window, with most people paying around $400 per window.
1) Toughened Glass
Also known as tempered glass, this type is stronger and more durable than ordinary glass. A tempered glass window is heat-treated and designed to shatter into small, harmless pieces when broken, reducing the risk of injury.