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You have to redraw them unless they are parametric. In last version (v5) you can scale them too (you could do this for more than one door at a time depending if they are external or internal and you can select more than one at the same time).
In any case, the best option in my opinion would be leaving the doors untouched (I am guessing you have many to change). The thermal effect of that change will be negligible (1% difference in area...). Although your words "they want it to be simulated" seem as you may have a problem convincing your customer about this.
Good luck.