All interfaces which uses SBEM as the calculation engine (such as iSBEM and Hevacomp) will show the same results if the same building with all the same details are entered. Other accredited simulation software such as TAS do not use SBEM as the calculation engine. They may give slightly different results but it is not possible to say if the emissions will be higher or lower as this will depend on the building.
It is important to remember that for Part L, you are comparing the emissions from the building you enter to a "notional" building.
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