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Published on August 26, 2023 8:48 AM
As we all know we’re getting more hot weather than ever. A lot of our customers might not know how to use their new double glazed uPVC sash windows for optimum ventilation.According to experts, the Edwardians and Victorians installed sash windows with meticulous care, recognizing their ability to enhance air circulation within rooms and cool down properties during hot weather. These windows have proven to be so effective at providing natural air conditioning that the University of Cambridge conducted a study to understand their mechanics, aiming to inform the design of future low-energy ventilation systems.

1. Versatile Ventilation Control:

The unique design of box sash windows provides homeowners with versatile ventilation control. By having two moveable sashes, one above the other, you can easily adjust the opening size of each sash to regulate the flow of air. This flexibility allows you to find the perfect balance of ventilation according to your specific preferences and the changing weather conditions.

  • During mild weather, you can partially open both the top and bottom sashes to achieve a gentle breeze while maintaining a comfortable indoor temperature.
  • On hotter days, fully opening both sashes creates a more substantial airflow, effectively cooling down the room and promoting better air circulation. as lighter, warmer air escapes through the top, while denser, cooler air enters the building from the bottom.
  • In contrast, during colder weather, you can partially open the top sash while keeping the bottom sash closed. This “trickle ventilation” technique allows fresh air to enter from the top while preventing cold drafts from the lower part of the window.
Chartwell Green - Georgian style sash window
Chartwell Green - Georgian style sash window

Effective Air Circulation

Sash windows are known for their ability to facilitate effective air circulation within a room. The sliding mechanism allows for efficient cross-ventilation, where air enters from one side of the room and exits from the opposite side. This movement of air helps to replace stale indoor air with fresh outdoor air, improving the overall air quality and creating a more comfortable living environment.

Cross-ventilation is particularly valuable in rooms with limited external wall space, as it ensures a constant flow of fresh air without relying solely on openings on one side of the room. This ventilation pattern is especially beneficial in bedrooms, living rooms, and kitchens, where proper airflow contributes to better sleep, reduced stuffiness, and efficient removal of cooking odours.

3. Improved Indoor Air Quality:

Sash windows play a vital role in enhancing indoor air quality by facilitating regular air exchange. As stale air is exhausted and replaced with fresh air, pollutants, allergens, and unpleasant odours are effectively removed from the room.

In modern homes with improved insulation, airtight windows, and heating or cooling systems, proper ventilation becomes even more critical to prevent the buildup of indoor pollutants. Sash windows offer a natural and energy-efficient solution for maintaining a healthy living space by allowing a constant supply of fresh air.

By regularly using sash windows to promote ventilation, homeowners can enjoy the benefits of a cleaner and healthier indoor environment, reducing the risk of respiratory issues and improving overall well-being.

Colin Greenslade
Written by Colin Greenslade
I'm the founder of Colin's Sash Windows. I disrupted the sash windows market in the UK in 2014 by introducing fixed prices for uPVC sash windows in the UK. Before this they were generally only available at very high prices through window installers. Today our business is one of the market leaders in supply only windows, doors and roofs in the UK.

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