Ambient temp and wort temp are not the same thing. Fermentation is an exothermic reaction, meaning that it generates heat. If you had your room at 68 during the height of fermentation, your wort could have been as high as 78.
I would keep the room with your fermentors in it in the low 60's if possible, then move your bottles to another closet that is closer to 70. If that is not possible, then do a search for "swamp cooler" and you'll find a cheap and easy way to keep your fermentors 5-7 degrees below ambient temp.