Honeywell's RTH7500D 7-Day Programmable Thermostat offers heightened levels of flexibility. This thermostat utilizes a green backlit display with simplified programming and easy to read text instead of complex and difficult to understand symbols. Exclusive to Honeywell; Smart Response Technology continually adjusts the pre-heating/cooling of your home to achieve maximum comfort at your personally selected times. This unit also automatically determines whether or not your home needs heating or cooling based on the surrounding temperatures. The RTH7500D is universally compatible and will work with virtually every system on the marketplace.