Ok... I just googled... Google says your average lows are 12F.
In that case, no, I would not box them up.
Since you say parts of the barn tend to be drafty I would build a poop shelf for them with a back and sides, NOT a top. Your roof there is pretty low anyway, and you don't want them sitting in a cloud of humidity from their breathing.
The back and sides of the poop shelf would keep the perch area draft free, and poop shelves make life MUCH easier.
The back side of the poop shelf can be up against where the Alpacas sleep... they will share a bit of heat that way.
If the air is really gusting through, then yes, you will want to try to block that as much as you can. Fresh air is great , blasting wind is not.
Making a box like coop, inside a barn, will reduce fresh air way too much.
One thing though, being in upstate NY, AND them being in a barn... you will need to figure out a way to give them a light on a timer. Be EXTREMELY careful though. Even a regular lightbulb in a barn is a huge fire hazard. I think there are cool LED lights that might be safer. Look into that.
But.. . Once you are much under 10F the feed requirements of poultry increase greatly. I find for the healthiest animals in cold weather a 10 hour day is best. That is long enough for them to eat enough...but not so long that they are forced to lay.
Also... higher protein is very good for cold. (Ignore the pro-corn people) I find 18% protein is good, 20% is better if it is staying below 0F.
In that case, no, I would not box them up.
Since you say parts of the barn tend to be drafty I would build a poop shelf for them with a back and sides, NOT a top. Your roof there is pretty low anyway, and you don't want them sitting in a cloud of humidity from their breathing.
The back and sides of the poop shelf would keep the perch area draft free, and poop shelves make life MUCH easier.
The back side of the poop shelf can be up against where the Alpacas sleep... they will share a bit of heat that way.
If the air is really gusting through, then yes, you will want to try to block that as much as you can. Fresh air is great , blasting wind is not.
Making a box like coop, inside a barn, will reduce fresh air way too much.
One thing though, being in upstate NY, AND them being in a barn... you will need to figure out a way to give them a light on a timer. Be EXTREMELY careful though. Even a regular lightbulb in a barn is a huge fire hazard. I think there are cool LED lights that might be safer. Look into that.
But.. . Once you are much under 10F the feed requirements of poultry increase greatly. I find for the healthiest animals in cold weather a 10 hour day is best. That is long enough for them to eat enough...but not so long that they are forced to lay.
Also... higher protein is very good for cold. (Ignore the pro-corn people) I find 18% protein is good, 20% is better if it is staying below 0F.