Comfort Series Non-Programmable Thermostat Comfort Control at Your Fingertips   Auto changeover. Large push buttons and backlit LCD screen. Battery-free operation. Five-year limited parts warranty.   Benefits - Carrier’s Programmable Thermostat allows you to adjust temperature with intuitive programming. Features - When setting up your Programmable Thermostat, you'll appreciate its ease of use. The following features are standard:   Easy-to-follow instructions are posted inside the door for quick reference. Clean filter reminder lets you know when the air filter needs to be changed. Auto-changeover automatically switches between heating and cooling operation on days when both systems are required. Large push buttons respond quickly to your touch. Optional outdoor temperature sensor.         Specifications