I usually clean the coop and goat stall every week or two or three...going on three right now and the critters are spending a lot of time in there. It smells stronger than it has in the past. Tonight I really needed some chicken/goat tv so I bundled up, went out there, got some clean hay to sit on, and just parked my butt right there in the goat stall. The chickens obliged me with their presence (they can get in the goat stall and roost on the wall that divides their coop space from where the goats can hang out.) The smell truly wasn't too bad, it was there but not at all overwhelming. The goats got their attention and the the rooster, though he kept an eye on me, didn't seem too bent out of shape by my presence. Anyway, all this to ask, since the smell is simply there and not enough to chase me out, and since I was comfortable in my boots/coat/hat/mitts...then the barn must not be overly in need of cleaning and it must not be overly cold in there, eh?
I don't think it will hurt to let them go until after this cold snap breaks. If you had to take down some of the smell, you could use some barn lime in the litter for the time being. So long as you don't have a lot of moisture, I think they are fine. I swear, you would flip to go into my barn. I wasn't below zero in there today, just down to about 4-5 degrees. Putting the extra plastic up on the runs sure makes a difference. It is cold and their water freezes, but there isn't any wind blowing in, so it feels significantly warmer.
I only wear cheap jersey fabric gloves, and after the first few minutes my hands warms right up. They are cold until I get working and moving around, then they warm right up. If I get them wet, that is another story. I do have waterproof gloves I can put over them, but they get really cold and take a lot longer warm up from working. As long as one keeps moving and working and keeps the blood pumping, that will keep the hands warmer. DH thinks I am nuts. If I were carrying metal the whole time, that would be a different story, but all my handles and scoops are plastic that I use for the most part.
I will say, the top layers of the heated dog bowls freeze in this stuff. The birds keep a hole open on top, but I have break about a half inch layer of ice off most of them. I am hoping this is our last cold cold spell, but I know that is a long shot.