If its a screened lid your going to have to cover it or all humidity and heat will be lost. Tape cardboard to the lid and to 3 sides of the tank for insulation. That alone will change your temperatures and humidity a lot. After that if you want to poke a few holes in the top for a little circulation that's OK but the screened lid terrariums for a ball python are no good until you modify them for heat retention.
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