Turning a Dumb AC Unit Smart (Without Losing My Security Deposit)

# Summary A software engineer in a NYC rental apartment created a DIY smart AC control system by attaching an ESP32-controlled stepper motor to his unit's analog knobs, allowing him to remotely control the AC through Home Assistant without damaging the unit or losing his security deposit. The $15 solution uses a shaft coupler, L-bracket, and binder clips to mechanically turn the AC's manual controls based on temperature sensors, demonstrating a creative low-budget approach to automating rental apartment appliances.