Product Description

1-Week Programmable Thermostat – RTH221B1039
Simple Programming – One program runs for the entire week (4 periods per day)
Energy Savings – Program to save up to 33 percent on annual heating and cooling costs (if used as directed, savings may vary depending on geographic region and usage)
Easy-To-Use – Basic operation keeps programming easy
Works with low volt heating/cooling systems including millivolt & single-stage heat pumps without auxiliary heat
Does not work with heat pump systems with back-up heat or electric baseboard heat (120-240V)
1 Year Limited Warranty