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The point is that NO two homes are ever alike in terms of BTU loss or total energy needed to heat them.
You can take identical plans, build them on different lots, and find them to vary signifcantly in terms of BTU loss based upon nothing other than the lot and location.
That said, a home's BTU loss is determined in part by:
1.amount of exposed exterior wall surface area
2.amount of wall and ceiling insulation
3.existance of slab/crawlspace/full basement/pier construction foundation
4.number of exterior windows and doors
5.type of heat
6.thickness of walls
7.height of ceilings
8...and so forth
You need to assess a FULL BTU assessment for each based upon many criteria before deciding which plan is most "efficient".
One plan may be more "efficient" to construct.....Yet least "efficient" to operate.