Well, if you're smelling ammonia, you will pretty much *have* to open the windows if that is your only means of ventilation, yes. Hopefully it will be warmish and not too windy for a few days
It might be worth thinking about how you can create more ventilation on a day-in day-out basis (without getting it too drafty, or, since you are uninsulated, too cold). There are ways of retrofitting it.
Good luck,
Pat

It might be worth thinking about how you can create more ventilation on a day-in day-out basis (without getting it too drafty, or, since you are uninsulated, too cold). There are ways of retrofitting it.
Good luck,
Pat