Eco4 domestic funding refers to financial support for energy efficiency improvements in homes, particularly targeted at low-income and vulnerable households. It is part of the broader Energy Company Obligation (ECO) scheme in the UK, which mandates large energy suppliers to fund measures that reduce energy consumption and improve heating efficiency. Eco4 focuses on providing insulation, heating upgrades, and other energy-saving measures to make homes warmer, reduce energy bills, and lower carbon emissions.