High quality energy efficient windows

How does energy-efficient glazing work?

Energy-efficient glazing works by reducing the amount of temperature transfer between the inside and outside of a building through the windows. This is achieved through various techniques and technologies such as:

• Double or triple glazing: This involves using two or three panes of glass with a gap of air or gas (usually argon or krypton) between them. The gap between the panes creates an insulating barrier that reduces the amount of heat transferred through the window.
• Low-emissivity (low-e) coatings: These coatings are applied to the surface of the glass and reflect heat back into the room while allowing light to pass through. This reduces heat loss through the window and keeps the room warmer.
• Warm edge spacers: These are used to separate the glass panes in a double or triple glazed window. The spacer is made of materials that are less conductive than traditional aluminium spacers, reducing heat loss through the edge of the window.
• Gas fills: In double or triple glazed windows, argon or krypton gas is used to fill the gap between the panes. These gases are less conductive than air, reducing heat transfer through the window.

What is the warm edge?

A warm edge spacer is a component in a double or triple glazed window that separates the glass panes and maintains the spacing between them. The spacer is usually made of a material that has low thermal conductivity, which reduces the amount of heat lost through the edge of the window.

The name "warm edge" comes from the fact that the spacer reduces the temperature difference between the edge of the glass and the surrounding environment. This reduces the risk of condensation forming on the inside of the window, which can lead to issues such as mold and rot.

Warm edge spacers, are made of materials such as thermoplastic or silicone foam, which have lower thermal conductivity and improve the overall energy efficiency of the window.In addition to improving energy efficiency and reducing condensation, warm edge spacers can also improve the durability of the window. By reducing the stress on the glass caused by temperature changes, they can help to prevent cracks and other types of damage.

How is energy efficiency in windows measured?

Energy efficiency windows are measured using several different metrics, which help to quantify the amount of heat lost or gained through the window. Some of the most common metrics used to measure energy efficiency in windows include:

• U-value: This measures the rate of heat transfer through the window, expressed in watts per square meter per degree Celsius (W/m²K). A lower U-value indicates better insulation and less heat loss.
• Solar Heat Gain Coefficient (SHGC): This measures the amount of solar radiation that passes through the window and enters the building. It is expressed as a percentage, with higher numbers indicating more solar heat gain.
• Visible Transmittance (VT): This measures the amount of visible light that passes through the window and enters the building. It is expressed as a percentage, with higher numbers indicating more light transmission.
• Energy Star Rating: This is a certification system developed by the U.S. Environmental Protection Agency (EPA) to help consumers identify energy-efficient products. Energy Star rated windows meet specific energy efficiency criteria, including U-value, SHGC, and air leakage.

By measuring these metrics, homeowners and builders can compare the energy efficiency of different windows and make informed decisions about which windows to use in their building projects.

How much can be saved on energy costs with modern windows?

The amount of energy cost savings that can be achieved with modern windows depends on several factors, including the type of window, the size of the window, the climate, and the energy costs in the local area. However, in general, upgrading to energy-efficient windows can result in significant energy cost savings for homeowners and building owners.

Replacing single-pane windows with energy-efficient windows can result in energy cost savings up to - 40 % per year for a typical single-family home. The savings will depend on the climate zone and the specific characteristics of the windows, but these estimates give an idea of the potential savings.

Upgrading to energy-efficient windows can also increase the value of the property. Home-buyers are increasingly interested in energy-efficient features, and properties with energy-efficient windows and other features may command higher prices on the real estate market.

Overall, the energy cost savings that can be achieved with modern windows will depend on a range of factors, but in general, upgrading to energy-efficient windows is likely to provide significant financial and environmental benefits.

How much do energy saving windows cost?

The cost of energy-saving windows can vary depending on several factors, including the type of window, the size of the window, the features of the window, and the installation costs. In general, energy-saving windows are more expensive than traditional windows, but the cost can be offset by the energy cost savings and other benefits over time.

When considering the cost of energy-efficient windows, it's important to also factor in the potential energy cost savings. While the exact amount of savings will depend on a range of factors, such as the local energy costs, the climate, and the specific features of the windows, energy-efficient windows can result in significant energy cost savings over time. In addition, energy-efficient windows can provide other benefits, such as increased comfort, improved indoor air quality, and increased property value.

Overall, while energy-efficient windows may be more expensive upfront than traditional windows, the long-term financial and environmental benefits make them a smart investment for many homeowners and building owners. It's important to carefully research the options and choose windows that provide the best combination of energy efficiency, durability, and affordability for your specific needs.

Which windows are suitable for passive house?

Passive house windows are an important component of passive house design, as they play a critical role in reducing energy consumption and maintaining indoor comfort. Passive house windows are designed to meet strict energy efficiency standards, with a focus on minimizing heat loss and maximizing solar gain. Here are some of the types of windows that are suitable for passive house construction.

Most of the windows and doors that Neuffer is offering can achieve Passive House Values requirements by using energy efficient glass, high insulation profiles and modern materials. We also have profiles that have already passed the Passive House Institute test, and are certified as Passive House Components:

• Energeto 8000
• Energeto 8000 ED
• TwinSet Energeto 8000 ED
• Eco Idealu
• Eco Plano