For heat, the first thing to do is insulate as much as you can. If the enclosure is sitting directly on a shelf or ESPECIALLY if it's sitting directly on the floor, put some sort of insulating material in between. A piece of foam such as an aquarium mat is perfect, but other kinds of foam or blankets will work too. Also insulate the sides and back, leaving only the front clear for viewing. Foam panels, foam core, cork panels, blankets, cardboard, etc.
Covering the screen will increase the humidity because it decreases ventilation. As the substrate gradually dries, you may need to cover more of it than you do wheen the substrate is new, and you may need to adjust how much is covered when the weather and humidity outside change. Wherever the screen is covered with foil, you can also cover that area with some other insulating material to help keep heat in.
If you're using a CHE or other lamp to heat the cage, you might switch to a radiant heat panel. An RHP can be mounted under the screen, and since it actually sits all the way inside the cage, it loses less heat to the room than a lamp fixture sitting above the cage. That means more heat benefit at lower wattage, and it's easier to safely insulate above it.
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