5 ms·

I build homes. This isn't standard in the US. I don't know how much cost it added -- probably not a lot. 10-20% I'm guessing. But, it's not low-cost.

• ehnto 5y ago
  Surely it depends on where you are in the US?
  • bombcar 4y ago
    Yep, a standard midwest home is a huge energy efficient monster in Southern California.