They are better insulated than traditional windows, which means that they don't allow heat or cold to transfer through them as easily.
Increase property value
Energy-efficient windows can also increase the value of your home. This is because they are a desirable feature that many potential buyers are looking for.
Protect furniture from UV ray
This is because they are often coated with a low-emissivity (low-E) coating, which blocks out most of the sun's UV rays.
Require little maintenance
Energy-efficient windows are often made with durable materials that require little maintenance.
Save money on energy bill
ENERGY STAR certified windows are third-party tested and certified to meet strict energy-efficiency standards. This means that you can be confident that you are getting a high-quality product that will save you money on your energy bills.