3.8, 2006 caravan, rear and front a/c

Since the rear section of van is approx. 2x size of the front section, it would appear that the front a/c if used alone has alot of a/c space to cool down.

would it be more economical when running a/c to turn rear on as well as the front?

i guess without rear passengers, i could use some sort of curtain and section of the front section for economy purpose. your thoughts.

 

I think what difference does it really make? Most of these vans come just with front a/c and they seem to work just fine for most.