Question re: floorplans - passivhaus/sustainable building

Heelo there!
We've been wanting to downsize out home. I'm intrested in the "passivhaus" and green/sustainable/*highly-insulated* ideas, and what I'm wondering is this: Beyond the fact bump-outs and corners and do-dads create problem with sealing and insulating (and just generally add expense), are there specific types of floor-plan/room layouts, or whather it can be pretty much any layout?
((I also would want to try to cluster the plumbing as much as posible, which doesn't seem like it ought to be so difficult for one kitchen, one laundry room, and 1.5 baths...but again, I haven't seen anything online that I really like.))
Most of what I want tends to be very simple, but I have yet to see a room layout that suits me. So I'm wondering whether there is something special about "passivhaus"/etc. layouts, or whether basically any cube/rectanlge shape can be adapted?
Thanks in Advance!
- Kris K.
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OH!, also, I forgot to add: WHy don't I ever read about the "passivhaus" or similar in houses down south? With gas heat, the killer bill is always the air conditioning, but there seems to be this insane notion that places in hot climates somehow don't "need" much (if any) insulation, so does anyone know what's up with that...?
Thanks again!
- Kris
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