Hi,
I have a Split Entry house in Southern NH. Originally lower level
unfinished, with insulation in the floor joists to the main level. The front
2 foot "overhang" has vented soffit.

We finished the lower level, and did not change the insulation/soffit, but
installed a fiberglass backed ceiling tile. I have not thought much about
it, until I knocked one loose this week and realized how much cold air is
flowing in. Now I wonder, should I be leaving this soffit opened like an
attic? I'm not sure what purpose this serves now, and whether I can improve
my heating bills by changing this.

thanks
Bob