At a bare minimum, get the digital thermostats that you can program to have a high and low limit. (Use an excuse. Tell them you limit it to 65 because otherwise the A/C freezes up.) Also, put in a rotary 10-hour timer next to the thermostat with instructions on how to turn it on. That way, you don't have to show up immediately to turn off the A/C after they leave.
Or just go with the 65 degree limit and jack up the price $10 a night to make up for any abuse.
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