This can be done in ADE XL in IC61, using the "MTS" (Multi-Technology Simulation" capability. It allows different models or temperatures to be given to different blocks. It's intended to support cases where you have multiple chips (say) on different processes which may use models which have the same name - you can scope the models to part of the circuit hierarchy - and at the same time, apply different temperatures to each.

Since it requires the netlisting to be done differently (using lexical scoping), it's only supported in IC61.

Regards,

Andrew.