Kathy -

My husband was complaining of the dry air, too - he was out fixing the mailbox yesterday - but it was a balmy 30 degrees F!

I don't know if they have any humidifiers at the site - if there are, he should beg borrow or steal one for at night/by his desk. If there isn't a humifier, see if there is a hot plate, coffee makes or electric tea pot. Barring that, a pan of water by the hot air source will help a bit. If he can give himself a little relief at night/doing desk work it will help.

We have a Hamilton Beach Invisible Mist humidifier that makes white noise which helps me sleep, and mist with helps my husband. Maybe get two - one for at home, one to send up with him next time. Best wishes to you both - you are both tough cookies!