I'm not in the Northeast (but I bet I'm at a higher latitude & altitude
).
Here's what I did - built a small coop, with about 10 square feet available per bird. Okay, that's not so small but one-half of this coop is open to the fresh air. It is covered by the main roof, has a board floor but is screened on 2 sides.
Here's a more important
"rule of thumb" than
square feet: "Provide 3 cubic feet of air (total enclosed space) per pound of body weight for permanent indoor confinement quarters." These "digitS'" consider that a minimum but one really should consider air in the coop especially if it well-insulated.
The other one-half of my coop is
fully insulated - or, at least, the ceiling and all 4 walls have a stud frame and 4' fiberglass insulation. The floor is covered with pine needles throughout the year. One-quarter inch plywood sheaths the interior and exterior. The exterior siding is cedar board and battens. Because of its shape and ceiling height this room has only about 5 cubic feet of space per pound of hen enclosed.
There's always been at least a pair of pigeons in with the hens but other than them & a forty-watt light bulb, all heat is provided by the hens. During severe weather, they will spend the entire day in their 25 cubic feet. But, it requires single digit weather to drop the interior air low enuf to freeze their drinking water. I can't remember their eggs ever freezing even in below zero outdoor temperatures
.
Steve
edited to note: a 5 pound hen requires 15 cubic feet enclosed space,
minimum. So my hens have about 25 cubic feet each.