The ratio of windows and natural light in living space
Architectural studies show that the ratio between window area and room area is the core factor determining the level of natural lighting. In Southeast Asia, a ratio of about 1:7 is considered appropriate, helping light distribute evenly without causing glare or overheating.
For small rooms under 15m2, one or two-wing windows are sufficient to ensure ventilation. Conversely, larger spaces need wider windows to enhance air exchange. In addition, the height of windows also needs to be compatible with the depth of the room; for example, a room 2m wide should have a door about 86 - 96cm high for effective light spread.
According to Professor John Straube - a construction science expert at the University of Waterloo (Canada), "designing windows with the right proportions helps optimize natural light and reduce the need for electric lighting, thereby improving energy efficiency for the home.
Ventilation, health and energy efficiency
Not only light, windows also directly affect the air quality in the house. Windows with suitable sizes help increase natural ventilation, reduce humidity and limit the accumulation of pollutants in closed spaces.
In addition, the location and direction of the window are also related to the ability to regulate the temperature. For example, south-facing windows often receive cool breezes, while the west-facing windows absorb more heat, requiring shielding solutions to reduce heat.
According to Dr. Edward Mazria - architect and founder of Architecture (USA), "scientific window design can significantly reduce energy consumption, while improving health by enhancing light and natural air.
In addition, construction standards also recommend that the bottom edge of the window should be at least 80 - 90cm high to ensure safety and reasonable light distribution. The maximum height usually does not exceed 220cm to avoid heat loss and maintain air conditioning efficiency.
In summary, window size should not be chosen based on feeling but should be based on scientific principles of lighting, ventilation and energy. A reasonable design not only makes the house more beautiful but also improves the quality of life and long-term health for users.
