This unit of competency specifies the outcomes required to use the regulatory and non-regulatory functions of a house energy rating software tool to assess the thermal performance and other energy-related features of residential buildings. It includes the competencies required to apply the full functions relating to thermal performance, including free running modes, and non-thermal performance functions that address factors, such as hot water, lighting, water use and embodied carbon dioxide.The unit supports the work of Nationwide House Energy Rating Scheme (NatHERS) assessors engaged in assessing and making recommendations for improving, the thermal performance of residential buildings.In some jurisdictions, this unit of competency may form part of the accreditation, licensing, legislative, regulatory or certification requirements for NatHERS assessors.