When it comes to windows, you might have heard of the term “Solar Heat Gain Coefficient” or SHGC. But what exactly is SHGC and why does it matter for homeowners and business owners? This article will explain SHGC and why it’s important for managing heat gain through windows. We’ll also compare SHGC to another important metric, U-value and explain how these factors impact comfort and energy efficiency in indoor spaces.
Understanding Solar Heat Gain Coefficient (SHGC)
Solar Heat Gain Coefficient (SHGC) is a measure of the amount of solar heat that enters a building through its windows. This number ranges between 0 and 1 and shows the percentage of solar radiation that passes through a window, both directly transmitted and absorbed and then released as heat inside the building. Simply put, a lower SHGC means less solar heat enters the building, while a higher SHGC indicates more solar heat transmission.
Comparing SHGC to U-value
The amount of solar heat that enters a home through windows is measured by the SHGC (Solar Heat Gain Coefficient). The U-value, on the other hand, shows how fast heat moves through a material like a window. The lower the U-value, the better the insulation properties. While SHGC focuses on heat gain from sunlight, U-value takes into account heat loss or gain through conduction, convection, and radiation. When used together, SHGC and U-value provide a comprehensive understanding of a window’s ability to regulate both heat gain and heat loss.
Addressing Concerns Over Heat Gain
Homeowners and business owners often worry about heat gain through windows, particularly in areas with hot summers. Excessive solar heat gain can cause discomfort, higher cooling costs, and overworked HVAC systems. One way to tackle this issue is by selecting windows with lower SHGC ratings or opting for solutions like window film. (Window film is by far the more affordable option.) By doing so, occupants can significantly reduce heat gain without compromising natural light levels or obstructing their views.
Understanding how much solar heat enters a building through windows is important. Knowing about SHGC helps homeowners and business owners choose the right energy-efficient solutions, like window film. To create better indoor spaces that are comfortable, energy-efficient, and sustainable, get 3M Window Film from ClimatePro. We’ve been making homes and offices better with window film for over 40 years. We can do the same for you. Call us at 707.755.7337 or get started online here.
