Lower humidity would increase temperature, my basement is about 16C in winter, 18C in summer, not much different. I do keep a dehumidifier running at all time though.
just switch your furnace fan on, and let it run 24 hours a day. you will need neither dehumidifier nor heating fan. generally speaking, a furnace fan is about 400~600W, a dehumidifer is about 400~800W, and a heating fan mormally more than 1000W, so ...