# What is the best insulation wall for a house? ACC wall, Cavity wall, etc

Normally, people use Autoclaved Aerated Concrete (AAC) to build a concrete house because ACC is a good thermal insulation brick that easy to buy and not expensive

And another way i've heard about insulation wall is Cavity wall. IMO, it rarely find a house that use this kind of wall.

Then the main topic of discussion here might be

Autoclaved Aerated Concrete (AAC) wall vs Cavity wall which one is the best thermal insulation wall?

Note that another method can be purpose if it better than ACC wall and Cavity wall

• For what climate? Are you trying to keep heat in or out? Is the intention to have high thermal mass, or low? What's your ventilation strategy? Are insurers fussy about particular construction methods? Is this coastal or any other location exposed to driving horizontal rain? Does the wall have to be structural? – EnergyNumbers Feb 10 '15 at 13:44
• Are you filthy rich? If so, use aerogel. Though calling it "best insulation" may be wrong, because it's by far too efficient - your body heat alone would make your room unlivable. :) – SF. Feb 10 '15 at 14:53