I'd move the incubator to another room. We turn heat down in winter at night too but at hatch time I set it at 65F and leave it for 3 weeks. It's probably less money than heating a storage room with electric. And if your space heater doesn't have a thermostat then your going to have fluctuations anyway.
Thanks for the suggestion Egghead_Jr, but there really isn't anywhere else I can put it. I said "back bedroom" but to give you a clearer idea, our house is a smaller one story with 3 bedrooms down one hall on the west half of the house. One of these, which is across from the Master bedroom at the end of the (short) hallway, is the room the incubator is in. It is on the south west corner of the house. The only reason it is unoccupied at the moment is because of some room re-arranging after my Gpa passed away last year and we wanted to re-do the floor in this room before moving a bed and other furniture back in it. So it is currently a seed starting room, and duckling brooding room, a sick hen room, and now, a hatching room!

