Honeywell T87 Range Stops

The mechanical current versions of Honeywell’s classic T87 “Round” thermostat come in three configurations: heat only, heat/cool, and large display heat/cool. Each of these models features a range stop option (available separately). The range stop sets a defined temperature range within which the thermostat can be set. It's a simple way to conserve energy and to stop unwanted changes in temperature.