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If you want to work on refrigerant circuits as part of heat pump installations, you'll need an F-Gas qualification such as the City and Guilds Level 2 Award in F-Gas and ODS Regulations. For broader renewable energy work, a Level 3 Award in Renewable Energy Technologies covers additional technologies. MCS certification is the recognised route for installers working on government-backed schemes, and your employer or training centre can advise on the steps toward that.