There should be a circuit breaker for the AC on your electrical panel that you can shut off. However, the thermostat is most likely the culprit. They fail fairly regularly. Easy to replace.
Elliott, Vicky, and Sadie, our GSD
2014 Redwood36RE Titan Disc brakes, 17.5 " Sailun Tires
2013 RAM dually, CTD, Aisin Tranny, CC, LB 4x4