Even some photo periods will stunt if it gets too cold. He's looking for ideas on how to control his temps so he can avoid that. I have a finished, heated basement. My tents are on the other side of the wall from the finished area in the mechanical room. Because my basement is heated, it's easier to regulate since I have a readily available source of warmer air to pull into my grow area.
All houses are different, and everyone's situation is unique ... as a group, I'm sure we can toss enough ideas his way so that he can control his grow room environment.