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Сomparing double glazed sash windows to energy-efficient options

Posted onPosted on 1st Jun


Energy Efficiency Showdown: Sash Windows vs. The Alternatives

Classic sash windows, renowned for their timeless elegance, have evolved to meet modern energy-efficiency demands. The integration of double glazing into these traditional designs, often through retrofitting double glazed windows on to the original window frame, has transformed them into formidable contenders in the realm of energy-saving windows.

As homeowners grapple with escalating energy costs, the allure of double glazed window replacement is undeniable, particularly when considering the long-term benefits of reduced energy consumption. Double glazed windows cost more upfront than their single-glazed counterparts, but their energy-saving potential often outweighs the initial investment.

However, with a multitude of energy-efficient options flooding the market, it’s imperative to understand where double glazing sash windows truly stand. This comprehensive guide will delve into the merits and demerits of these windows, pitting them against other prevalent choices.


Unveiling the Double Glazed Sash Window

Double-glazed sash windows, also known simply as double glazing, consist of two panes of glass separated by an insulating gas layer, usually argon. This ingenious design drastically curtails heat transfer compared to single glazing.

In fact, the glass thickness is important for efficiency, as thicker panes provide superior insulation, albeit at a potentially higher double glazed windows cost. The most common type, sash window double glazing, retains the traditional charm of these windows while offering modern energy-saving benefits.

This is a perfect solution for those who want to preserve the character of their wooden sash windows while improving their thermal efficiency. The sash mechanism, featuring sliding top and bottom panels, ensures optimal ventilation and airflow regulation.


The Allure of Double Glazing

  • Improved Energy Efficiency: Double glazing slashes heat loss in winter and heat gain in summer, resulting in reduced energy consumption and a smaller environmental footprint. This is especially crucial as energy prices continue to rise, making double glazed window replacement a sound investment.
  • Tranquility Restored:  Acting as a sound barrier, double glazing repels external noise, fostering a serene living space. This can be particularly beneficial in urban areas or near busy roads.
  • Security Fortified: Modern iterations often incorporate multi-point locking systems, elevating home security and providing peace of mind for homeowners.
  • Timeless Elegance Preserved: Sash windows retain their classic appeal, especially in older or traditionally styled homes. Double glazing seamlessly integrates with this aesthetic, preserving the window’s charm.
  • Condensation Conquered: Double glazing minimizes condensation, a common issue with single glazing or older windows, averting mould and dampness problems. This contributes to a healthier indoor environment.


Navigating Double Glazed Windows Cost and Considerations

  • Financial Investment: While double glazed windows might entail a higher upfront cost than some alternatives, the long-term energy savings and heightened property value can justify the expense. As with any window, the glass thickness is important for efficiency. Thicker glass enhances insulation, but it’s a balance with weight and cost.
  • Maintenance Matters: Modern sash windows demand less upkeep than their predecessors, yet periodic cleaning and lubrication are vital for seamless operation. This ensures the longevity and optimal performance of the windows.
  • Ventilation Variability: Although sash windows offer commendable ventilation, their airflow might not match that of casement windows, which open fully. This is a consideration for rooms that require maximum airflow. In some cases, secondary glazing can be added to existing sash windows to enhance insulation without replacing the entire window.

A Deeper Look at Condensation: Why Double Glazing Wins

Condensation, the bane of single-pane windows, arises when warm, humid air encounters a cold surface, forming water droplets on the window pane. The resulting dampness can trigger mould growth, rot wooden frames, and peel paint or wallpaper. Double glazing triumphs over this issue by elevating the inner pane’s temperature, thereby reducing the temperature differential between the interior and exterior.


Comparing Double Glazing to Other Energy-Efficient Options

Casement Windows

Casement windows are hinged on one side and open outward like a door. They offer excellent energy efficiency due to their tight seal when closed. However, they may not be suitable for all architectural styles.

Tilt and Turn Windows

Tilt and turn windows can be tilted inward for ventilation or swung inward like a door. They offer good energy efficiency and security but can be more expensive than other options.

Fixed Windows

Fixed windows don’t open and are the most energy-efficient option due to their airtight seal. However, they offer no ventilation, making them unsuitable for rooms that require airflow.

Choosing the Right Window for Your Needs

When deciding on the best window type for your home, consider the following factors:

  • Energy Efficiency: How important is energy efficiency to you? Are you looking to significantly reduce your energy bills?
  • Style of Windows: Do you have a specific architectural style you want to maintain? Does the window type complement your home’s overall look?
  • Ventilation: How much airflow do you need? Are you looking for windows that can be opened wide for maximum ventilation?
  • Budget: What is your budget for new windows? Are you willing to invest in higher-end options for better energy efficiency and features?
  • Condensation Concerns: Do you live in a humid climate or have experienced condensation issues in the past?


Double-glazed sash windows offer a unique combination of traditional aesthetics, improved energy efficiency, noise reduction, and condensation control. With a wide range of styles and options available, they can be tailored to suit your specific needs and preferences. While they may be more expensive than some other options, their benefits often outweigh the cost.

When considering double glazed window replacement, remember that the investment goes beyond financial savings – it enhances your home’s comfort, value, and environmental impact. However, it’s crucial to weigh the pros and cons of each window type and consider your individual needs and preferences before making a decision. Reputable companies offer quality service and a wide variety of double glazing options, so you can find the perfect solution for your home.