R-Value problem

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Hi all eQUEST user!
I'm a bit confused about my input values inside the Wizard mode VS Detail
mode.
In "Building Envelope Constructions" window (3 of 25) I put an Overall
R-Value of 20 h-ft2-?F/Btu...
But, when I go into the spreadsheet view (in Detail mode) and take a look at
the Constructions details, I see a U Value of 20 Btu/h-ft2-?F!?
It's not realy the same thing!

Did you know why the software does not make the convertion R to U value
correctly? Or is it my mistake? Should I put a U value when the software
asks me to put an R value in the Wizard window?

Thanks to all and sorry for my poor English (it's not my first language) !
:-)

Martin

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