Robertshaw 1 Heat 1 Cool Manual Thermostat with 6 Year Warranty RS8110. Robertshaw has designed Pro-Series wall thermostats, including its non-programmable single stage heat/cool RS8110, to be simple and economical, yet powerful. This basic non-programmable suits many owners’ HVAC systems and needs. It is loaded with many valuable features, such as a 4.6-square-inch blue backlit display, adjustable temperature differential (swing) and short cycle protection. The RS8110’s easy installation enables owners to provide cooling and heating comfort quickly. And a 6 year limited warranty adds peace of mind to the Robertshaw quality that is built in. Also, many HVAC contractors discover that the RS8110 suits many common installations, so they can reduce their truck stock. The unit also includes an intuitive contractor/technician setup menu.