Cardinal LoE has been the leader in energy-efficient glass. This manufacturer offers a full line of residential windows and doors. We are an authorized dealer and distributor of these energy saving products. Low-emittance (low-E) coatings are microscopically thin, almost completely invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface. This microscopic layer will greatly reduce the U-factor of the glass by blocking the flow of heat. The way heat moves from the outside of the glass to the inside in multilayer glazing is what is known as thermal radiation. What this means is that the heat moves from a warm pane of glass to a cooler pane. When a glass pane is coated with a low-emittance material between two glass layers it blocks a significant amount of this radiant heat transfer. This is how most of the heat flow through the window is blocked. Low-E coatings are transparent to so the homeowner can't see the coating. There are different types of low-E coatings available and your Florida Impact Windows and Doors professional can help you to decide on the best windows and doors for your home or condo.