my phals like to have a few cool 50's ish nights this time of year before they make their flower spikes.
other than that, like the others said - keep up what you've been doing if the leaves look healthy and when it's ready, you will get more long lasting blooms.
One thing i did with my first orchid that messed me up is that when your orchid has buds DON'T MOVE IT! or they will all fall off.
hope this helps!
