Do you have a bathroom where you don't need the bathtub or shower that you can convert to "Vanda City"? Here's what I did for the Vandas when I was living in a condo, to protect them for the winter.
http://orchidcentral.org/GrowingAreas/Vandacity.jpg
I even rigged a "sprinkler system". a submersible pump in a 5 gallon bucket.
Once the weather warms up in a month or so, I suggest that you move them outside, give them a good bath every day or 2 with a hose (or rain if Mother Nature cooperates). So you can do the dunking temporarily. You can figure out an indoor arrangement for next fall/winter. But they're happiest when the roots run free.