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What is a SHGC and why is it important?

SHGC stands for Solar Heat Gain Coefficient. It is a measurement used to describe the amount of solar heat that can pass through a window or a glazed surface into an enclosed space, such as a building or a room. The SHGC is expressed as a number between 0 and 1.


An SHGC rating of 0.30 means that 30% of the available solar heat can pass through the window.

A lower SHGC value indicates that the window or glazing system is better at blocking solar heat from entering the building, thus reducing the need for cooling and energy consumption.

Why the SHGC is important for human comfort.

  1. Temperature Regulation
  2. Glare Reduction
  3. Thermal Comfort
  4. Daylighting Considerations

In summary, the Solar Heat Gain Coefficient (SHGC) plays a crucial role in human comfort by influencing indoor temperatures, glare levels, energy efficiency, thermal comfort, and daylighting. Balancing the SHGC with other window properties is necessary to create a comfortable, energy-efficient, and visually pleasing indoor environment.

How can we improve the SHGC in a building?

To improve the Solar Heat Gain Coefficient (SHGC) in a building, there are several strategies and techniques that can be employed:

  1. Window Selection
  2. Shading Devices
  3. Window Films or Tinting
  4. Exterior Landscaping
  5. Building Orientation and Design
  6. Automated Systems
  7. Energy Modeling and Analysis

By implementing these strategies, it is possible to improve the Solar Heat Gain Coefficient of a building, leading to increased comfort, reduced energy consumption, and improved overall efficiency. It’s important to consider the specific climate, building type, and project constraints when selecting and implementing these measures.


Consulting with architects, engineers, or energy professionals can help determine the most suitable SHGC rating for specific project requirements.

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