How do you handle tenant AC costs?

[Joseph Weisenbloom]

Tenants love to crank AC systems to absurdly low temperatures which creates a high likelihood of breaking the AC unit. In my area HVAC techs charge $1000s just to look at the unit after it breaks. I have a 3 year old unit that cost me $10,000 to install that may need to be replaced soon because of tenant shenanigans. At these numbers HVAC repair breaks down to $2000 cost per year on average to replace a $10k unit every 5 years. 

How are you managing AC systems? Do your tenants have access to thermostat? Do you have a set temperature limit? Or somehow deducting from deposits the constant AC repair costs?