Welcome to NY.. I think, lol.Sullivan County.
In the first coop I was going to add vents above the door and on the opposite side. The door was going to be a dutch door so we can open only half with an windown that opens on the opposite side. Obviously with wire cloth.
In the second coop pic I was going to add a 7ft long x 1 ft high vent on the back side (the tall side) and then another window on the opposite side wall that can be opened in the mornings when we let the girls out. Reinforced with wire cloth.
Keep in mind if your window is the same hight of the roost, it's going to cause a draft in the winter.
Ventilation should be open 24-7 to allow moisture from the poop and breathing to escape. If you're planning on expanding to 10-12 birds, you should plan your ventilation on that number.