Turn on AC using Arduino and ir shield to turn on TCL112AC, or TCL TAC-12CHSA/HCI Using Arduino Uno, and IR Shield found in here: https://www.cooking-hacks.com/documentation/tutorials/control-hvac-infrared-devices-from-the-internet-with-ir-remote/
Also using this lib: https://github.com/z3t0/Arduino-IRremote