Get a window unit air conditioner for the room he is in. They are not that expensive. The small ones you can get for about $100 and they are easy to put in. This is the best way to keep temps during the day where you need them and drop them at night.
Window AC units are superior to portable AC units in every way possible. The only downside...many Homeowner Associations do not allow them in the neighborhood. Something about
going against the aesthetics of the neighborhood. This was the only reason I went with a portable AC unit. Window AC units are more efficient, less costly, take up minimal space, self-vent collected water, and are better for the environment. It's a darn shame that they have been banned by many HOAs,
but it is always best to research your own neighborhood as you may have an HOA that allows them or you may not have an HOA at all. Either way, an AC unit is needed--at least for now.
All that matters is that you are making the changes. Your parameters were perfect during the cold season, and now that the weather is warming up, you are adjusting accordingly. A couple of warm nights is not life-threatening, but the stress builds up over time.
I think that's a flawed analogy. A better one might be your daughter having a health-threatening sensitivity to something in your home (e.g mold, formaldehyde). Even if you were willing to spend the tens of thousands of dollars to rid the house of the health risk, I think you would still rather she stay someplace else until the matter was rectified.
I think there is a difference between a person having a "health-threatening sensitivity" and a person having a suboptimal night of sleep. A few warm nights is not going to threaten a jacksons chameleon's life span. As long as you can provide nighttime drops sooner rather than later, your cham will be fine. Without playing the analogy game, a more apt analogy would be a person sleeping in a room with a loud fan or having a room temperature that is uncomfortably high
or low. When you wake up from these nights, you feel more tired than usual because your body was not able to completely shut down and relax. Instead, your body was trying hard to regulate body temperature or drowning out the sound of the fan.
Hope everyone is enjoying their weekend. Be happy y'all (--that's an order)!
Oh, and let us know if you have any more questions.