Yes. I live in a hot area of the US. Walls and ceiling need insulation so you can keep the house cool. Usually by Air conditioner. Attics a lot of time are under insulated so cause a the AC unit to work harder to keep it cool. Attics are not livable or a good place to store stuff.
Where I live most houses are built on concrete slabbing so you don’t have a crawl space under your house.
But… Insulation also insulates in summer against heat?
Yes. I live in a hot area of the US. Walls and ceiling need insulation so you can keep the house cool. Usually by Air conditioner. Attics a lot of time are under insulated so cause a the AC unit to work harder to keep it cool. Attics are not livable or a good place to store stuff. Where I live most houses are built on concrete slabbing so you don’t have a crawl space under your house.