The energy conservation and carbon reduction required for a sustainable environment also include the reduction of ineffective energy losses. As global warming becomes increasingly serious, the demand for air-conditioning operation will inevitably increase. However, even if most air-conditioning equipment has basic sensors to detect the output pressure, air volume, and temperature, they are rarely able to detect abnormal vibration generated by the equipment. In this study, we developed a microvibration detector with the IoT function and applied this technology to the detection of air-conditioner failure. The research results can lead to the implementation of the self-detection function of air-conditioning equipment in the future, so that when the air-conditioning equipment exhibits initial abnormal vibration, real-time response measures can be taken to reduce energy losses resulting from further failures of the air-conditioning equipment.