The Lux CAG1500 Clean Cycle Programmable Thermostat is a dual-purpose seven-day programmable thermostat. The mercury-free CAG1500 not only controls temperature, but it also utilizes Clean Cycle technology to improve air quality. Compatible with most types of conventional heating and cooling systems, this thermostat is preprogrammed with a schedule developed to save energy and reduce costs. It also offers the convenience of four programmable periods per day. CAG1500 Clean Cycle Programmable Thermostat At a Glance:Seven-day programmable thermostat with four periods per day Preprogrammed with an energy saving, and money saving schedule Clean Cycle technology cleans the air Backlit multicolored display with easy Speed Dial programming Electronic accuracy; 100% mercury free Compatible with most heating and air conditioning systems Thanks to a large lighted multi-color display and patented Lux Speed Dial, the CAG1500 is incredibly easy to use.Clean Cycle Technology Improves Air Quality The CAG1500 is unique among programmable thermostats in that it offers patented Clean Cycle technology, a feature that allows you to program your home"s fan to circulate air through the HVAC system"s filter, reducing airborne particles such as pollen, dust, pet dander, and other allergens. You can program the fan to run anywhere between 9 and 60 minutes each hour.Not only does this improve the quality of air throughout your home, but it also increases your energy savings and comfort. First, the fan only runs and uses energy when you program it to do so, preventing wasted energy and unnecessary use. Second, the fan is programmed to operate independently, using much less energy than it would take to circulate a home"s air by running the entire HVAC system.Seven-Day Programming with Four Periods per Day One of the easiest ways to reduce utility costs is to program your thermostat to fit your schedule. The CAG1500 lets you create a different program for every day of the week, and you can enter four different time periods and temperature settings in a 24-hour period (Morning, Day, Evening, and Night).User-Friendly Programming, Filter Monitor, and Key Lock Thanks to a large lighted multi-color display and the patented Lux Speed Dial the CAG1500 is incredibly easy to use. For further convenience, a graphic filter monitor indicates when the filter needs to be replaced or cleaned. The CAG1500 also offers a keypad lock to prevent unauthorized changes to the thermostat settings.Save Money and the Environment Like all programmable thermostats, the CAG1500 helps reduce energy consumption, but this efficient device takes savings a step further. To maximize your home"s energy efficiency, the CAG1500 comes preprogrammed with a default heating and cooling schedule that"s designed to save up to $500 in energy costs over a year, and it can also help cut down on your carbon footprint. Because the CAG1500 is 100% mercury free, you can be sure it"s a safe and environmentally conscious choice for your home. Compatible with Most Heating and Air Conditioning Systems The CAG1500 is compatible with most heating and air conditioning systems, including one-stage heat and one-stage cool systems (gas, oil, or electric heating, and single-stage heat pumps), two-wire heat-only hydronic systems (hot water baseboard and radiator), and millivolt systems (wall heaters and gas fireplaces).Two "AA" alkaline batteries are required for operation (batteries not included). About Lux: Innovation, Quality, and Value Since 1914, Lux Products Corporation has manufactured quality products for the home. It all began with turn-of-the-century timing devices, the forerunners of the now world-famous Lux 60-Minute Timers. Building on the success of these simple and utilitarian items, Lux grew into the multifaceted manufacturer and merchandiser it is today. The Lux name has always stood for innovation, quality, and value. The company"s full line of electronic and mechanical thermostats offers models for nearly every heating and cooling application. See how you can save money and conserve energy with Lux.What"s in the Box Lux CAG1500 Clean Cycle Programmable Thermostat, mounting hardware, installation guide, and instruction manual. Not sure which model is right for you? Click here for a complete comparison of LUX programmable thermostats.