I am finishing my an heated attic room and will be starting a second grow. Im not sure how to link to a grow journal but I will be updating mine to show how I did it. In general I built a false wall 4 foot off the back (Not an expensive one just enough tohold insulation - If you picture what you need to do is instead of a tent it is going to be and insulation tent), One side is Veg other is flower. I bring air in from the soffits of the house and it vents through the peak. For Temp control I bought a 15$ simple plug in device that turns a vent fan at 78 and off at 70. The lights will give you almost enough heat, but you will need a small space heater on the floor to keep the bottom warm. If your interested I can give you more details. I live in Northeren Ohio, Pretty much doing the same thing.