Multi-pane glass units with air or gas-filled spaces between panes to improve thermal insulation, reduce energy costs, and minimize condensation in windows and doors.
What is Insulated Glass?
Insulated glass, also known as double glazing or Insulated Glass Units (IGU), consists of two or more glass panes separated by a spacer and sealed together to form a single window unit. The space between the panes is filled with air or an inert gas like argon to improve thermal insulation.
This technology significantly reduces heat transfer through windows, making buildings more energy-efficient and comfortable.
Key Features
- Multiple Panes: Typically two or three glass layers
- Sealed Air Space: Prevents air circulation between panes
- Inert Gas Fill: Argon or krypton for enhanced insulation
- Spacer Systems: Materials that separate and seal the glass edges
- Desiccant: Moisture-absorbing material prevents fogging
- Energy Ratings: Measured by U-factor and Solar Heat Gain Coefficient
Benefits
Insulated glass units provide superior energy efficiency compared to single-pane windows, reducing heating and cooling costs significantly. They also minimize condensation on window surfaces and provide better sound insulation for quieter indoor environments.
The improved comfort and energy savings typically offset the higher initial cost through reduced utility bills.
Common Applications
- Residential Windows: Standard in modern home construction
- Commercial Buildings: Office and retail glazing for energy efficiency
- Skylights: Overhead glazing requiring thermal performance
- Curtain Walls: Large-scale commercial glazing systems
- Doors: Patio doors and entry doors with glass panels
- Cold Climate Applications: Essential in areas with extreme temperatures
Learn more about energy-efficient windows at the Insulating glass Wikipedia page.