A way to keep the fermentations temperatures down is to put the carboy into a shallow container of some kind with 4 inches of cold water in it. Wrap a damp towel around it, with the bottom of the towel hanging down in the water. Position a fan to blow air across the towel. This will evaporate water from the towel taking heat away. The towel will keep wicking up water from the pan and will stay damp. I've dropped fermentation temperatures by as much as 7F this way. I ferment in my insulated and heated garage. The heater in the garage is isolated from the rest of the house, so I'm able to control the room temperature very precisely during most of the year.
If my damp towel and fan is getting my fermentation too cold, I can just dial up the heat in the garage a few degrees.
Even during the hottest part of the summer, I seem able to hold fermentation temps down at about 68F ( a little warm maybe, but livable) for an ale.