Miserable Vandas, moving on

[Cookiemonster]

Hello everyone!
I'm fairly new to being an orchid owner, I started getting into all this around August. I ordered several Vandas in September, I live in Arizona, I'm a college student with no greenhouse and have been struggling to keep them moderately happy and having little to no success . I bought a huge humidifier and got everything set up in this tiny room with fairly decent light....but it seems its not the 'right' conditions. Some of the leaves have turned yellow and fallen, the roots of some of the plants have turned brown or shriveled. I called my local orchid society and we'll be setting up a time for them to come and pick them up. Im really really sad about all this, its been months of work and I love them, but as a college senior who has no idea if she'll settle or relocate nationally or internationally, I think this is the best course of action. I say one day soon I will own my own greenhouse, have the right resources and funds and take up this hobby all over again. Till then I will live vicariously through you all.
I will be hanging out on the boards and stuff, thank you to everyone for their advice and kindness