Would tenant be responsible for AC repairs?

[Albert Johnson]

It has been really hot this week. When the tenant moved in everything was in good working condition.  HVAC is about 3 years old. Tenant is saying AC won't cool to 73 degrees. It hols on 80.

I told the tenant not to lower it that low, becausing doing so will over heat it and cause it o malfunction.

if the AC goes out due to them not listening will they be responsible for repairs?