Coated glass alters its optical properties by depositing a thin film of metal or metal oxide onto the glass surface using physical or chemical methods. Taking common Low-E (low-emissivity) glass as an example, its surface is coated with a silver-containing film, effectively reflecting infrared rays (heat) while allowing visible light to pass through, achieving a "heat-insulating without blocking light" effect. Experimental data shows that homes using Low-E coated glass can experience a 3-5°C reduction in indoor temperature during summer and a reduction in heat loss of over 30% during winter, significantly reducing air conditioning and heating energy consumption.
Furthermore, some coated glass types (such as solar control glass) can control visible light transmittance (typically between 10% and 70%) by adjusting the film thickness and material, reducing the harm of direct sunlight to furniture and people while protecting privacy. For example, using coated glass with 30% light transmittance in floor-to-ceiling windows in the living room or bedroom ensures indoor lighting while preventing external views from penetrating.
