The Honeywell thermostat range covers a broad choice of temperature control solutions for homes and light commercial spaces. At the smart end are the T9 Wi-Fi smart thermostat, which works with the smart room sensor for T9 and T10 thermostats to measure conditions in individual rooms, as well as the X8S and X2S smart thermostats. The range also includes conventional models such as the TF228, TF428/418, TF243, X2P and X1N, and a 750 millivolt heat-only non-programmable thermostat for millivolt heating systems. Medium and large thermostat guards protect units from accidental knocks or tampering in public or shared areas. With Honeywell's long experience in heating and cooling controls, there is a model for different systems and budgets.