The Nest scheme calculates the effects of energy efficiency improvements on the homes using a Reduced Data Standard Assessment Procedure (SAP)1 rating. [
Mae cynllun Nyth yn cyfrifo effeithiau gwelliannau effeithlonrwydd ynni ar gartrefi gan ddefnyddio sgôr 1 Gweithdrefn Asesu Safonol Data Gostyngol (SAP) [ 1 ].