Overview Today's energy-efficient windows can dramatically lower the heating and cooling costs associated with windows while increasing occupant comfort and minimizing window surface condensation problems. However, consumers are often confused about how to pick the most efficient window for a residence. Furthermore, these properties are based on static evaluation conditions that are very different from the real situation a window will be used in. It calculates heating and cooling energy use and associated costs as well as peak heating and cooling demand for specific window products.
Users also specify size, shading, and thermal properties of the window they wish to investigate.
The relative energy and cost impacts of two different windows can be compared. Annual Energy Subcommittee's efforts. Some of these changes affect program results. As a result, it is strongly recommended that all users switch to version 3.1. Results for only windows, by orientation, are still included and are useful for looking at specific cases where different windows may perform more efficiently depending on the direction they are facing.