Robertshaw’s 5-1-1/7-Day programmable single stage heat/cool Pro-Series RS9110 thermostat is designed with the contractor in mind. It offers simplicity in the form of easy installation and intuitive programming menus, including a contractor setup menu. Yet it is loaded with many valuable features, such as a 4.6-square-inch blue backlit display, adjustable temperature differential (swing), short cycle protection and a filter change reminder. Contractors also love the RS9110’s quick, easy installation, which large terminal blocks and a universal sub-base make possible. And a 6 year limited warranty adds peace of mind to Robertshaw quality.