纽约一位软件工程师为租赁公寓设计了一套DIY智能空调控制系统，总成本约14至16美元，在不损害押金的前提下实现了远程控制和自动恒温功能[1]。该系统采用ESP32微控制器驱动步进电机，通过机械方式旋转空调旋钮，经过1.5个夏季的实际运行，可靠性约为80%[1]。
系统硬件由ESP32开发板、步进电机、轴联器和L型支架等廉价零件组成[1]。初期版本（V0）利用旧IKEA书架支架和显示器VESA螺钉进行组装，后来升级至V1版本，采用可调节金属L型支架以提高稳定性[1]。控制器通过MQTT协议与Home Assistant集成，并使用AirGradient ONE作为温度传感器，冷却和加热容限均设置为0.5°C[1]。该方案成功解决了模拟旋钮空调无法远程控制的问题，但长期使用中夹子和纸板支架容易松动，导致摩擦过大而失速，是主要的可靠性瓶颈[1]。
A software engineer in New York designed and built a custom smart air conditioning control system for rental units without modifying the original equipment or risking a security deposit.[1] The solution employed an ESP32 microcontroller paired with a stepper motor and low-cost components, achieving a total system cost of approximately $14 to $16.[1] The device mechanically drives the AC unit's analog dial knobs, enabling remote control and automated temperature maintenance through integration with Home Assistant via MQTT protocol.[1]
The project evolved through multiple iterations to improve reliability and structural stability.[1] The initial V0 version utilized salvaged IKEA bookshelf brackets and monitor VESA mounting screws, while the refined V1 iteration incorporated adjustable metal L-brackets and a compact ESP32 development board.[1] The system incorporates an AirGradient ONE temperature sensor and maintains cooling and heating tolerances of 0.5 degrees Celsius each.[1] After more than 1.5 summers of real-world testing, the system demonstrated approximately 80 percent reliability.[1] The primary limitation involved loosening of mounting clamps and cardboard supports over extended use, causing increased friction that occasionally stalled the motor.[1]