I live in s florida also and I will give you my data to interpret as you see fit. Some may disagree with my experimenting however my animals are thriving and reproducing.
I reached a point with the number of animals I had this winter, that dealing with the heat tape and thermostats became a large pain in the butt. In the spring I began the process to go ambient only. Right now the only thermostats I have running are my home one and my incubator. The only time my incubator really cuts on is at night. Minimum temp I hit at night is around 78 but it is usually around 80. I was actually more concerned about highs than lows so I carefully observed my animals and really experimented on days that I could actually be home all day. Long story short, the hottest I was able to let the snake room get was 88 before I started to see unusual behaviour in the animals. At a constant 89 they began to show signs of stress. So, the hottest I allow is 88 during the day. At that point the AC kicks on. By the time fall comes I intend to be able to do ambient for lows as well. I'm insulating up the snake room and putting in an efficient space heater.
So, to your original question, right now I am reading 92 on my porch. Too hot in my opinion.
To others who might want to try ambient... From what I experienced, when you bring new animals in they need to be acclimated gradually to this setup. New animals seemed to be more nervous than usual without having access to a gradient. The temps are also probably a little higher than the environments they came from and there is no cool side.
I have never had humidity problems, but i open up the house at night. AC sucks humidity out so that is a consideration. Outside, the humidity is almost always high.
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