Hi,
IMHO the heater would be a poor choice especially running 24/7. If you need to use electric then I would suggest a small fan heater used only while you’re in there. That way you mostly heat the air to keep you warm.
I doubt the temperature is anything to do with the problems you’re having with your machine. Sounds to me you’ve got a twist in your nut ;o) is this your X axes that has the problems?
John