Reading this made me chuckle. I live in Las Vegas. The FIRST thing I did when I started hosting was lock up the theromostat in the space we rent out. I keep the a/c at 75 degrees. That is the temp that the a/c still feels cool...once I lower it in the dead of summer it just runs constantly and is still freaking hot inside. It is a bit warm...but when it is 120 degrees outside, 75 feels great lol. I have had only TWO complaints out of all the folks who have stayed. One guy was super anxious and I told him..."Trust me, it will feel just fine." He walked in after spending the day outside in August and said, "Hey, you are right, it feels great in here!" I even cover up the thermostat box with paper so nobody can see the actual number. Honestly--I keep my house at 80 during the day and only lower it once the sun goes down...so I feel keeping that space at 75 is such a treat for people. My electric bill is...well, nobody wants to know!!!
And you are right. Alcohol, obesity, health issues, not drinking enough just plain water, etc etc...all these things make a difference in someone's comfort leve and we can't afford to keep playing around with the temps for a guest--it just simply doesn't fit financially.
You are paying your electric bill....so just be honest about the temperature you keep your space at. They can always find somewhere else. I don't think very many of us are keeping our a/c meatlock temps.