First, check the Warmer Homes Scheme eligibility criteria and submit an application to SEAI, including proof of the relevant social welfare payment if requested. If your application progresses, SEAI arranges an assessment of your home to identify suitable energy upgrades, which may include heating improvements where they are considered appropriate. An SEAI-appointed contractor may then provide further details, agree the proposed works and arrange installation. The upgrades and final scope depend on your home and assessment, so SEAI makes the final decision rather than GrantWise; check the current process on the official SEAI website.