The new Robertshaw 9420 is the next evolution in digital thermostats. The LCD display is clearly one of the largest in the industry, up to 80% larger than competitive models. Plus, the display is back lit, making it even easier to read in a dark room. This model is loaded with enhanced features. The 9420 comes with permanent winter and summer setpoint memory, allowing you to save both heating and cooling temperature settings. This eliminates temperature adjustments when switching systems for seasonal requirements. And our fully adjustable differential control provides increased comfort for your customers. The 9420 is compatible with all standard 24 Volt AC multi-stage heatpump systems.When you select a Robertshaw thermostat, youâve made the choice of an industry partner thatâs been making quality products for 100 years. Come home to affordable comfort.