Do summer blooming Phals need the fall cool nights?

[Goatherder]

As we are approaching the fall season here, I have read that to get the winter/spring blooming Phals to spike they need a period of 3-4 weeks of 55-60F nights.

My question is for summer blooming Phals, like violacea. Do they also need this cool time? or would that be bad for them?

I have a cooler room in my basement I can move them to if necessary, but I don't want to harm them.

Thanks