Have you considered a room humidifier, or if the space heater is the type with a fan, have the warm air blow across a pan of water, to increase the humidity in the room?
I would also make humid hides with either the eco-earth or spaghnum moss, your BP's will use them as needed. Mine did when they were in tanks. They also tend to do their business in them as well, which makes clean-up easy but they blew through the spaghnum pretty fast...
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