The programmable thermostat features a filter monitor and accommodates most gas, oil-fired, and electrical 24-volt and milli-volt furnace and cooling systems. It will not work however with multi- and single- stage heat pumps or 110/220-volt electrical baseboard heating systems. Displayed on an easy to read LCD screen, the thermostat's programmed temperatures range from 45 to 95 degrees F. The thermostat also conveys the room's current temperature from 30 to 99 degrees F. Temperatures above this range are denoted as HI, below as LO. The thermostat will automatically cut off heat operation for room temperatures above 95 degrees F, while interrupting cooling if below 40 degrees F. For sudden weather or schedule changes, users may opt to temporarily override programmed settings for increased comfort. Likewise, a hold option conserves energy while the home dwellers vacation. For general air circulation, a fan switch is installed. The thermostat illuminates a two-stage indicator light to notify low batteries, while lighting a filter-change light to ensure proper and reliable functioning. Two AA 1.5-volt batteries power the thermostat and must be purchased separately. This unit requires assembly upon arrival and purchase of any necessary hardware. Hunter offers a limited one-year warranty for this product. The thermostat weighs 9.6 ounces upon shipping. --Jessica Reuling