Adding Central Air/Heat
Putting together the trunk lines for the central air and heat.
Adding insulation for the trunk lines.
Cutting the floor to add in the air return.
Opening for the vent in the living room.
Cutting the kitchen floor for the vent.  The floor proved to be 3" thick with all the various flooring over the years!  There is hardwood under there, too!!
The ducting under the house.
The furnace going in under the house.