Insulated windows offer greater energy efficency than standard windows, resulting in lower energy bills. These efficiency gains provide greater thermal comfort, and provide the flexibility of allowing large window areas (such as a sunroom) without significantly increasing energy costs.

Even in homes with few windows, upgrading to insulated windows can result in noticable energy savings during hot or cold temperatures.

The contribution of an insulating glass seal to the energy rating of a window can be significant. Rice's offers a number of low-emmitance (or Low-E) glass options with the highest R value and lowest U value in the industry.