how to raise the temperature/humidity for my phal?

[Cerey]

I bought this phal from my local grocery store about a month ago. It's still in full bloom and the leaves look healthy. I've had a few phals before, but they never survive for more than a few months. I live in college dorms, and i find it kinda hard to maintain the correct levels of temperature and humidity, especially since i live in northern cali where its cold. Is there any inexpensive way i can do this?
I also applied keiki paste to one of the nodes, and a spike started forming. I expected this, since from what i have understood, the keiki paste enhances what is happening. Since its in flower and no new growth yet, a flower spike formed. I know the plant may be putting its energy in this new spike, so i really want to keep it alive. Any advice is greatly appreciated. Thank you!

-Cesar