I have a lot of phals. They all go outside for the summer but during the winter some go in my house and some go to my outside storage building that I converted to a 'grow room' it has no windows and is all artificial light. The ones in my grow room do much better than the ones in the house. I have some in the grow room that have been in bloom since January. The blooms in the house only lasted a month.
Edited to say. It is my understanding that phals need a couple of 50 degree nights to help them bloom. I don't have any facts to back that claim up. But I don't bring mine inside until the nights get in the 50s and they almost all bloom every year.
