Window film technical specifications were used to select the best window film to be applied to these glass doors leading to a balcony for improved comfort at home.

Deciphering Window Film Technical Specifications

Tim Traxler3M, Commercial Window Film, Residential Window Film

When selecting window film for your home or office, you’ll likely encounter a range of technical terms. Understanding window film technical specifications is crucial for making an informed decision that meets your needs for energy efficiency, comfort, and aesthetics. Keep reading to learn what all those scientific  words on the technical data sheets mean and why you should care about them!

Understanding Window Film Technical Specifications

What is a U-Value?

Definition: The U-value also known as thermal transmittance, measures the insulating characteristics of an object. With window film u-value measures the insulating properties of glass. 

U-Value Importance for Window Film: A lower U value means the film provides better insulation for your windows. The closer to zero the U-Value figure is the better. 

The Role of Emissivity

Definition: Emissivity refers to the window film’s ability to emit absorbed heat. Lower emissivity films reflect more heat back into the room.

Emissivity in Window Film: Emissivity ranges from 0 to 1. Windows without window film have close to the maximum emissivity, meaning they emit all of the thermal heat they receive. Window films with low emissivity ratings help retain indoor heat during colder seasons, enhancing comfort and reducing heating costs.

Visible Light Reflected vs. Transmitted

Visible Light Reflected: This specification indicates the percentage of visible light that the film reflects away from the window.

Visible Light Transmitted: Visible light transmitted shows the amount of visible light that passes through the film, illuminating your interior spaces.

Why Visible Light Reflected vs. Transmitted Matters for Window Film: Reflecting light can reduce glare and influence the visual appeal of your windows, which influences both interior ambiance and exterior aesthetics. Sun control window films often have glare-reducing capabilities and carry a higher percentage of reflected visible light. 3M’s Night Vision Film is a popular choice for glare-reducing film and reflects up to 19% of exterior  visible light on a double paned window.  

Shading Coefficient

Definition: The shading coefficient is a comparison of a window film’s heat gain reduction to that of clear glass, measuring its cooling load reduction capability.

Shading Coefficient values in Window Film: A lower shading coefficient indicates better performance in minimizing unwanted solar heat, crucial for reducing air conditioning needs in sunny climates. The value ranges from 1.0 to 0. For sun control window films, you will often see values below .5, meaning these films are 50% better than clear glass at blocking solar heat.

Solar Energy Rejected

Definition: This term describes a total amount  of solar energy that is blocked by the film and not able to pass through the glass.

Why Solar Energy Rejected Matters for Window Film: High solar energy rejection rates are key for keeping indoor spaces cooler and more comfortable during hot weather, significantly cutting down on cooling costs. High solar energy rejection also will help with decreasing fading of furnishings. 

Solar Heat Gain Coefficient (G-Value)

Definition: The measurement of solar radiation that passes through a window. Solar heat gain coefficient is used to appraise the energy efficiency of a window. 

Solar Heat Gain Coefficients in Window Film: The solar heat gain coefficient value ranges from 0 to 1 with lower values indicating less heat transmittance, keeping your space cooler. Higher SHGC values indicate that these surfaces will retain more heat.

Visible Light to Solar Heat Gain Ratio

Definition: This ratio assesses the film’s efficiency in allowing light in while blocking heat, offering a balance between illumination and temperature control.

The Importance of the Visible Light to Solar Heat Gain Ratio in Window Film: A higher ratio means you can enjoy ample natural light without the associated increase in indoor temperature, optimizing comfort and reducing reliance on artificial lighting.

Trust PA Window Tint for All Your Window Film Needs

Navigating window film technical specifications can seem daunting, but understanding these terms empowers you to choose a window film that aligns with the goals you have for your residential or commercial space. Our window film experts are at the ready to assist you in selecting the best window film for your space, and we can explain all the window film technical specifications in the process. Call 1-800-978-9756 or fill out a form online to schedule a consultation today!

PA Window Tint Inc. began serving central Pennsylvania in 1993. Over the years, we have extended service across Pennsylvania, helping homes and businesses with 3M Window Film needs. PA Window Tint is a 3M Prestige dealer, which identifies our company as a member of the elite network of dealers in the country that are entrusted with offering 3M’s highest quality products and providing impeccable installations. Give us a call at 1-800-978-9756  or fill out a form online.