Market-Leading Lowest U-Value Windows

Our timber sash and casement windows with a U-value below 1 represent a significant advancement in energy efficiency and sustainability. These innovative high thermal insulation windows are designed to provide superior performance, making them an ideal choice for homeowners and builders focused on reducing energy consumption and enhancing comfort. With a U-value below 1, these windows significantly minimize heat loss, ensuring that your home stays warmer in winter and cooler in summer, leading to lower energy bills.

One of the key innovations in these windows is the use of vacuum glazing. Unlike standard double-glazed windows, vacuum-insulated glazing windows feature a vacuum cavity between the glass panes. This vacuum prevents heat from escaping during cold winter months and stops outdoor heat from entering during the summer, making them high thermal insulation windows. The superior thermal insulation provided by vacuum glazing sash windows reduces the need for heating and cooling, leading to significantly lower energy bills.

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Why U-values Are Important

Less Heat Loss

The U-value measures how well a window prevents heat from escaping, with lower values indicating better insulation.

Less Money Spent

Low U-value windows reducing the need for excessive heating during summer and minimises the reliance on air conditioning during warmer months, this balance leads to lower energy bills.

Less Energy Use

Low U-value windows maintain a slim profile, preserving the traditional aesthetics of sash windows without compromising energy efficiency.

In addition to energy savings, these windows contribute to a more comfortable living environment by reducing drafts and cold spots near the windows. They also offer improved sound insulation, making homes quieter and more peaceful, even in busy urban areas.