I would try to keep them in a warmer room of the house. 60 in winter is too cold and it would be quite difficult to get your temps where they need to be even with additional supplemental heat.
Personally, I would select a room of the house to keep the snakes and put an oil-filled space heater (also on a t-stat) in the room. Keep the room temps at around 75 and your cages should be good with a controlled hot spot alone.
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