To apply for the ECO4 scheme, you should contact an accredited ECO installer or provider. They will assess your eligibility for the scheme and provide advice on the measures that could be installed in your home to make it more energy-efficient. The measures covered by the scheme include loft insulation, cavity wall insulation, solid wall insulation, and boiler replacements, among others. In some cases, households may even qualify for solar panels, which can help them generate their own clean energy and further reduce their carbon footprint.