Help diagnose and treat a few orchids.

[treefisher]

The temps were averaging about 70-75F overnight. Last night it got down to 65, which is the lowest it's been in months.

I'm summering 3 other orchids outside next to this dendrobium. All but this one are in good shape. I don't mist it. Should I? It does get rained on occasionally. I try not to let water sit on them for long when that happens.

When I first got the oncidium, I read somewhere that I should mist it in lieu of regular watering after transplant. This was supposed to help it acclimate to new surroundings easier; assuming it lived in a very humid environment for a long time ( a Lowe's bag). I questioned that but tried anyway. It just shriveled more, so I began regular watering. I seem to be getting the same results either way. You think the "sphag-n-bag" method would help here?