Grammatophyllum issues

[bergdj]

I got a Grammatophyllum about a month ago now. The guy i got it from said to give it lots of light and it's super easy to grow. I'm also fairly new at this.

Turns out I didn't have enough light in the house and one leaf turned brown and fell off. I also live in Colorado @ around 7000 feet so it's really dry. I decided the best solution to give it light and humidity would be to build a greenhouse, so I did. I put it out there and it's not doing much better. I went away for the weekend and just got back. The pseudobulbs are kind of shriveled looking and the leaves continue to brown. I think it may be beyond saving at this point. It's hard to find any Grammatophyllum advice out there though other than to water lots and give lots of sun. I don't know what I'm doing wrong. The only thing I can figure is that maybe its getting too cold at night. any advice would be appreciated.