Including the closely related term retrofit.
… R7: Package of insulation and glazing measures R8: Whole house deep retrofit to zero energy standard R9:Package of insulation and glazing measures R10: Shared ambient loop heat pumps R11: Individual ASHPs 6kW and EE measures R12: Individual ASHPs and EE measures R13: Whole house retrofit, ASHP, Solar PV and Battery Storage R14: Shared ambient loop GSHP and EE measures R1,R2,R3,R4 R5,R6…