As a stopgap you may consider building a little enclosure for your new lathe out of 2" foam and using a small spaceheater to moderate the temperature and hence the condensation.
You'll be VERY unhappy when you see rust blooming on your new cast iron ways!

The Chosin Few November to December 1950, Korea.
I'm not one of the Chosin Few but no more remarkable group of Americans ever existed.