What is the definition of a mini-split wall thermostat? A mini-split wall thermostat is a device used to control the temperature of a home or business. It works by connecting to an outdoor unit, which is usually connected to a ductless mini-split system. The thermostat is a wall-mounted unit that usually has an LCD display and a simple set of buttons. By pressing these buttons, users can adjust the temperature of their home or business, as well as other settings such as fan speed and humidity levels. The thermostat is also used to control the cooling and heating cycles of the system. It can be programmed to adjust the temperature based on the time of day or the temperature outside. Additionally, some thermostats can be connected directly to a home automation system, so users can control their environment from anywhere in the world. Mini-split wall thermostats are becoming increasingly popular due to their convenience, affordability, and ease of installation.