Rescheck is a software program developed by the U.S. Department of Energy (DOE) to help ensure that new residential and commercial buildings meet the energy efficiency requirements set by the International Energy Conservation Code (IECC). Architects, engineers, builders, and code officials use this program to calculate a building's energy efficiency and verify that it meets the minimum standards for insulation, windows, and other features.

Rescheck requires users to input various data points, such as the building's location, size, and materials. Based on this information, the program calculates the expected energy usage of the building. It then generates a report that indicates whether the building complies with energy code requirements and specifies which aspects need improvement for compliance.

This tool is essential for promoting energy-efficient design and construction practices, helping to reduce overall energy consumption and lower utility costs for occupants.