Hi.
I'm trying to update our finished attic space with plank white wash look. I f you Google "Jessica Helgerson Interior Design 03" you'll find my inspiration.

A few questions.

First, my attic is not vented in any way. What would you recommend to keep the heat down for living space other than a/c units?

Second, I am trying to mimic the white was board look of the image but without having to nail planks to the walls just to create texture. Could I use some sort of thin veneer wood to create this look but not break the bank?

Thanks