Finally figured out where the cold air entered the cabin we’ve been staying in during the transition. Just have to sit around on a cold windy day and pay attention and then start digging. Hadn’t been home much other than to sleep the past few days so just had been cold.
Found some slices of foam and a bunch of used plastic bags and covered the whole area around the seeping area. Since the wind has been blowing from that direction it made a difference almost immediately. Since the weather is to get colder it is our most effective prep to date. Long term probably need to do some redesign but it’s nice to get this fixed for now.