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This is the expected behavior of the measure. As you can read in the description: "Zone mixing objects will also be made for sub-surface air walls, but they can't be made adiabatic unless their base surface also is. A warning will be issued if that happens."

If you want to apply the measure to a subsurface, You have to set the constructions of the two based surfaces to 'Adiabatic'.

This is the expected behavior of the measure. As you can read in the description: "Zone mixing objects will also be made for sub-surface air walls, but they can't be made adiabatic unless their base surface also is. A warning will be issued if that happens."

If you want to apply the measure to a subsurface, You subsurface without conductive transfer, you have to set the constructions of the two based surfaces to 'Adiabatic'.'Adiabatic'. Else you can keep it like this to have both air mixing and conductive transfer.