Hi Skeenski, welcome to the OB.
I live in Canada, more specifically in Toronto and I have a bare root vanda that I have hanging in a south window, they like a lot of light, so the yellowing should not be from too much sun.
It gets watered every day by soaking for ten minutes in a bucket of distilled water. With our central heating in the winter I often mist it as well in the early afternoon, I have had my Vanda bloom twice this year, so this seems to be working for me.
I would also recommend watering weakly weekly. The yellowing leaves may be from under-watering.
When you are going away for a short time one thing you can do is place the vanda in a large vase or bucket and put a little bit of water in the bottom of the vase possibly with some pebbles. As the water evaporates hopefully the vanda will absorb some of that water. You don't want to have the roots touching the water for days at a time though, as they may rot.
Sorry this was so long, hope it was helpful though!
Sarah
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