The Trane XR103 TCONT103AN21HA Non-Programmable Heat Pump Thermostat is designed for precise temperature control and reliable performance. This digital thermostat works with single-stage heating, cooling, and heat pump systems (without auxiliary heat), ensuring compatibility with gas, oil, and electric HVAC systems, as well as millivolt applications. With a clear backlit display, it allows for easy operation and readability, even in low-light conditions. Engineered for temperature accuracy within ±1°F, this thermostat helps maintain consistent indoor comfort while optimizing energy efficiency. The simple, non-programmable design eliminates the need for complicated scheduling, making it ideal for those who prefer manual temperature adjustments. The heat/off/cool system switch and auto/on fan control provide flexibility in managing indoor climate, while the automatic heat-to-cool changeover ensures seamless transitions between temperature settings throughout the year. For system protection, the Trane XR103 features a five-minute compressor delay to prevent short cycling, extending the lifespan of your HVAC unit. The filter change reminder helps maintain peak system performance, reducing maintenance issues and improving air quality. Designed for quick and easy installation, it works with existing wiring and includes all necessary mounting hardware, terminal wire labels, and an installation guide. This thermostat is not compatible with multi-stage systems, 120/240V electric baseboard heating, or proprietary communicating HVAC systems. It includes two AAA batteries for added convenience, making it a plug-and-play solution for homeowners and professionals alike. Choose the Trane XR103 Non-Programmable Thermostat for a dependable, easy-to-use, and efficient climate control experience.