Dendrobium S/H Winter Watering Advice

[freezedried74]

I am new to growing orchids and have 3 dens that are doing very well growing in semi-hydro. I have read about not watering dens in the winter and wanted some advice to the questions below. I live in Michigan and my plants sit in a southern facing garden window. I currently water as needed (about once a week) with 125 ppm N, MSU fertilizer, and a couple drops of KLN.

1) How should I water my dens in the winter?
2) If I change watering when should I start/stop?
3) If I am still watering do I need to change my fertilizing?
4) Do I need to move my dens to a different location for the winter?

Thank you.
Brian