[ScottinVA]

Does the old house elect or the new house?

Old.. because the new House won't have been sworn in yet.

[Hieronymus]

Pretty sure it is the new. They’re sworn in at the beginning of January, and when the present process was put in place, the president didn’t take office until late March.

[IndispensableDestiny]

Does the old house elect or the new house?

Old.. because the new House won't have been sworn in yet.

The new Congress. Their term begins on Jan 3, the counting of electoral votes is on Jan 6.