Understanding the Impact of Blown Windows on Energy Efficiency in Preston and Blackpool

Understanding the Impact of Blown Windows on Energy Efficiency in Preston and Blackpool


Windows are an essential element of any building, providing natural light, ventilation, and aesthetic appeal. However, over time, windows can deteriorate due to various factors, and one common problem is blown windows. A blown window occurs when the seal between the glass panes fails, allowing air and moisture to enter the space between the panes, leading to foggy or cloudy appearance.

In this blog post, we will explore how blown windows can significantly affect energy efficiency in the cities of Preston and Blackpool in the United Kingdom. We will delve into the causes and consequences of blown windows, emphasizing the importance of timely maintenance and replacement to ensure optimal energy performance in residential and commercial properties.


Causes of Blown Windows

Blown windows are primarily caused by the deterioration of the sealant that holds the double or triple-glazed panes together. Several factors can contribute to this seal failure, including:

  1. Age: As windows age, the sealant becomes more susceptible to wear and tear, eventually leading to failure.
  2. Environmental conditions: Extreme weather conditions, such as high winds, heavy rains, and temperature fluctuations, can exacerbate the deterioration of the sealant.
  3. Poor installation: If the windows were improperly installed or low-quality sealant was used, they are more likely to experience seal failure.


Impact on Energy Efficiency

Blown windows can have a significant impact on the energy efficiency of buildings in Preston and Blackpool. Here’s how:

  1. Heat Loss: One of the main consequences of blown windows is increased heat loss. The air trapped between the panes acts as an insulating barrier, preventing heat transfer between the interior and exterior of the building. When this barrier is compromised, warm air from inside escapes, and cold air from outside infiltrates the building, leading to higher heating costs, especially during the colder months.
  2. Increased Energy Consumption: With heat loss through blown windows, the heating system has to work harder and consume more energy to maintain a comfortable indoor temperature. This increased energy consumption not only results in higher utility bills for homeowners and businesses but also contributes to higher carbon emissions and environmental impact.
  3. Reduced Comfort: Blown windows can create uncomfortable indoor environments. Cold spots near windows can lead to drafts, making occupants feel chilly and uncomfortable.
  4. Condensation and Mold Growth: Moisture infiltration through blown windows can lead to condensation on the interior surfaces of the glass. Over time, this can create an environment conducive to mold growth, potentially leading to health issues for occupants and expensive remediation efforts.


Economic Implications

The impact of blown windows on energy efficiency goes beyond increased utility bills. It also has economic implications for homeowners and businesses in Preston and Blackpool:

  1. Reduced Property Value: Blown windows can negatively affect the value of a property. Prospective buyers are likely to negotiate lower prices or request window replacements before committing to a purchase.
  2. Repairs and Replacement Costs: Addressing blown windows typically involves either repairing the seal or replacing the entire window unit. Both options incur costs, and delaying repairs can lead to more extensive damage and higher expenses.


Solutions for Blown Windows

Fortunately, there are several solutions available to address blown windows and restore energy efficiency in buildings:

  1. Seal Repair: In some cases, blown windows can be salvaged by repairing the failed seal. This involves removing the affected glass unit, resealing it, and reinstalling it. However, this solution may not always be effective, especially if the window frames are damaged or the units are outdated.
  2. Window Replacement: When blown windows are beyond repair or the frames are damaged, full window replacement becomes the most viable option. Investing in high-quality, energy-efficient windows with improved seals can significantly enhance the energy performance of a building.
  3. Regular Maintenance: To prolong the lifespan of windows and prevent blown windows, regular maintenance is crucial. Homeowners and businesses should conduct periodic inspections, address any minor issues promptly, and hire professional window maintenance services when needed.



Blown windows can have a profound impact on energy efficiency in buildings located in Preston and Blackpool. The increased heat loss, elevated energy consumption, and reduced comfort levels resulting from seal failure make it essential for property owners to address blown windows promptly. By investing in timely repairs or window replacements, homeowners and businesses can not only improve energy efficiency but also reduce utility bills, enhance property value, and contribute to a more sustainable environment for the future. Regular maintenance and proactive care of windows can go a long way in ensuring their longevity and optimal performance, ultimately benefiting both occupants and the wider community.

With an office in Blackpool to help cover the Fylde Coast as well as being able to cover Preston and the surrounding area, give us a call and we can talk through your specific needs and requirements

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