He also installed 2 of 3 bathroom fans (whisper quiet, too).
The contractor reinforced the hatchway cellar stairs by adding a central bracing piece in the middle of each step/tred riser. A 3 foot, insulated, steel door was framed in and installed, a deadbolt and a key locking knob installed. The outer areas will later have scraps of insulation to fill in the cracks. I can just imagine the heat loss over the past 57 years!