Emerson 1F80-0471 5-1-1 Day Programmable Thermostat for Single-Stage Systems 5-1-1 day or 5-2 day programmable options for maximum convenience Compatible with single-stage heating, cooling and heat pump (without aux) systems Easy-to-read 4" display with backlight Precise temperature control of plus/minus 1 degree F Exclusive Cool Savings feature saves energy during peak A/C demand periods