Energy Efficiency of Bi-Folding Doors
Glass Inc

by Glass Inc

28 May, 2024

Energy Efficiency of Bi-Folding Doors


Bi-folding doors are not only a stylish and functional addition to any home or business, but they can also significantly contribute to the energy efficiency of your space. By incorporating advanced thermal insulation properties, weather-tight seals, and high-performance glazing, bi-folding doors can help maintain a comfortable indoor temperature, reduce energy consumption, and lower your utility bills. In this article, we’ll explore the various factors that contribute to the energy efficiency of bi-folding doors and how you can maximize their thermal performance.

Thermal Insulation Properties

One of the key aspects of energy-efficient bi-folding doors is their thermal insulation properties. By minimizing heat transfer between the interior and exterior of your home, well-insulated doors can help keep your space warm in the winter and cool in the summer. Consider the following insulation factors:

Insulation FactorDescriptionBenefits
Frame materialBi-folding door frames made from materials with low thermal conductivity, such as uPVC or thermally broken aluminum, provide better insulation than standard metal frames.Reduced heat transfer and improved thermal performance.
Weatherstripping and gasketsHigh-quality weatherstripping and gaskets create a tight seal between the door panels and frame, preventing drafts and air leaks.Enhanced comfort and energy efficiency by minimizing air infiltration.
Insulated glazingDouble or triple-glazed units with low-emissivity (Low-E) coatings and insulating gas fills, such as argon or krypton, greatly improve the thermal performance of bi-folding doors.Increased thermal resistance, reduced heat loss, and improved overall energy efficiency.

To learn more about the different types of bi-folding doors and their insulation properties, visit our dedicated sub-topic page.

Energy-Efficient Glazing Options

The type of glazing you choose for your bi-folding doors can significantly impact their energy efficiency. At Glass Inc., we offer a range of high-performance glazing options designed to maximize thermal insulation and minimize energy loss, including:

Glazing OptionDescriptionU-Value Range
Double glazingTwo panes of glass separated by a spacer and filled with insulating gas, providing improved thermal insulation compared to single-pane glass.1.4 - 2.7 W/(m²·K)
Triple glazingThree panes of glass with two spacers and insulating gas fills, offering superior thermal performance and noise reduction.0.8 - 1.4 W/(m²·K)
Low-E coatingsMicroscopically thin, transparent coatings applied to the glass surface to reflect infrared heat back into the room, reducing heat loss in winter and heat gain in summer.N/A
Insulating gas fillsInert gases, such as argon or krypton, filled between the glass panes to slow down heat transfer and improve insulation.N/A

To explore the customization options available for your bi-folding doors, including energy-efficient glazing, visit our dedicated sub-topic page.

Solar Control and Shading

In addition to thermal insulation, effective solar control and shading can further enhance the energy efficiency of your bi-folding doors. By managing the amount of solar heat gain and glare entering your space, you can maintain a comfortable indoor environment and reduce the need for artificial cooling. Consider the following solar control options:

Solar Control OptionDescriptionBenefits
Tinted glassGlass that is treated with color additives to absorb a portion of the solar energy, reducing heat gain and glare.Improved comfort, reduced cooling loads, and enhanced privacy.
Reflective coatingsThin, metallic coatings applied to the glass surface to reflect solar energy and reduce heat gain while maintaining natural light transmission.Reduced solar heat gain, improved thermal performance, and lower cooling costs.
External shading devicesAwnings, pergolas, or retractable screens installed outside your bi-folding doors to block direct sunlight and control solar heat gain.Adjustable shading, reduced heat gain, and extended living spaces.

To discover the benefits of bi-folding doors beyond energy efficiency, visit our dedicated sub-topic page.

Energy Ratings and Certifications

When choosing bi-folding doors for your home or business, it’s essential to look for products with energy ratings and certifications that demonstrate their thermal performance. Some common energy efficiency indicators include:

Rating or CertificationDescription
U-valueMeasures the rate of heat transfer through the door assembly, with lower values indicating better insulation.
Solar Heat Gain Coefficient (SHGC)Represents the fraction of solar radiation that passes through the glazing, with lower values indicating less heat gain.
ENERGY STAR®A certification program that recognizes energy-efficient products meeting strict guidelines set by the U.S. Environmental Protection Agency.
National Fenestration Rating Council (NFRC)A non-profit organization that provides standardized ratings for the energy performance of windows, doors, and skylights.

At Glass Inc., we are committed to providing bi-folding door solutions that meet or exceed industry standards for energy efficiency, ensuring that you can enjoy a comfortable and sustainable living space.

Professional Installation and Maintenance

To maximize the energy efficiency of your bi-folding doors, it’s crucial to ensure proper installation and regular maintenance. Poorly installed or maintained doors can lead to air leaks, drafts, and reduced thermal performance, undermining their energy-saving potential.

At Glass Inc., our experienced technicians follow industry best practices and manufacturer guidelines to guarantee a precise and weathertight installation. We also offer professional maintenance services to keep your bi-folding doors in optimal condition, preserving their energy efficiency and functionality over time.


Investing in energy-efficient bi-folding doors can provide numerous benefits, from enhanced comfort and reduced energy costs to a smaller carbon footprint and increased property value. By choosing bi-folding doors with advanced thermal insulation properties, high-performance glazing, and effective solar control options, you can create a more sustainable and comfortable living environment.

At Glass Inc., we are dedicated to helping you achieve your energy efficiency goals with our wide range of bi-folding door solutions. Our knowledgeable team is available to guide you through the selection process, recommending the best options for your specific needs and preferences.

To learn more about the various aspects of bi-folding doors, from their types and customization options to maintenance tips and outdoor applications, explore our comprehensive set of sub-topic pages. Contact Glass Inc. today to discover how our energy-efficient bi-folding doors can transform your space and contribute to a greener future.

Got a question? Contact us.