Provided by the US Department of Energy, the Home Energy Scoring Tool provides an "asset rating" of a home's energy use under standardized occupancy and operational conditions. The API allows developers to develop third party applications capable of generating home energy scores.
With these APIs, approved software developers can generate home energy scores as a stand-alone service or as an add-on to a home inspection or comprehensive energy assessment. Functionality of the API includes the ability to describe a home and get results and scoring label. The API uses SOAP calls and responses are in XML.