Thanks Nick for good explanation.

Actually in my project we are using almost 2ft wide external walls to get
the effect of thermal mass. if I consider external wall area in eQUEST model
my area deviation is almost 4% and mismatch in conditioned area is more than
this. So project energy consumption would be more and also not able to match
TR for the project.
Actually we are also planning to go for 2.5% renewable energy credit, if I
consider external wall than PV cost would be more.

Can I exclude external wall area for eQUEST modeling ?

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With Thanks and Regards
Praveen