Energy-efficient glass with a microscopically thin metallic coating that reflects infrared energy while allowing visible light to pass through, reducing heat transfer and improving building energy performance.
What is Low-E Coated Glass?
Low-E (low-emissivity) coated glass features an ultra-thin metallic coating, typically made of silver or tin oxide, that reflects infrared energy while allowing visible light to transmit through the glass. This selective transmission significantly improves the thermal performance of windows and glazed doors by reducing unwanted heat gain in summer and heat loss in winter.
The coating is so thin it’s virtually invisible but dramatically improves energy efficiency.
Key Features
- Selective Transmission: Blocks infrared while allowing visible light through
- Thermal Performance: Significantly reduces heat transfer through glass
- UV Protection: Filters harmful ultraviolet radiation
- Optical Clarity: Maintains excellent visibility with minimal tinting
- Durability: Hard coat versions provide long-lasting performance
- Multiple Types: Available in different coating formulations for various climates
Benefits
Low-E coated glass dramatically reduces energy costs by improving insulation performance of windows and glazed doors. It helps maintain comfortable indoor temperatures, reduces HVAC loads, and provides UV protection for interior furnishings and fabrics.
The energy savings typically offset the additional cost within a few years through reduced utility bills.
Common Applications
- Residential Windows: Home window replacements and new construction
- Commercial Buildings: Office buildings and institutional glazing
- Insulated Glass Units: Combined with double or triple glazing for maximum efficiency
- Skylights: Overhead glazing requiring thermal control
- Conservatories: Glass rooms and enclosed outdoor spaces
- Energy-Efficient Retrofits: Upgrading existing glazing for better performance
For energy efficiency information, see the Low-emissivity window Wikipedia page.