I recommend reading the care sheet for Boa’s. 88-90 surface on hot side and 78-80 surface on cool. Ambient temps should be 78-80 and not drop below 75. I’ve read on hear 88 or a little cooler even on the hot side for surface temps I would prefer to have a thermostat that turned off if it failed than trust a timer on a light burning full song 12 hours despite how high it is.
We are talking an ambient temperature here of a 5 degree swing from cool to hot if you do let it drop to 75 over night. Ambient temps are the air or room temps and not the surface temps that can be checked with an IR gun. These temps should be just above the surface or snake level for which you need thermometers preferably with a hygrometer for reading ambient and humidity. All these heat sources should be regulated by thermostat. A couple degrees here or there is a bigger deal for snakes than humans.
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