The Honeywell Resideo TH1110U4000 FocusPRO^® N100 is an OEM digital non-programmable thermostat for 24 volt single-stage systems, offering precise temperature control, broad equipment compatibility, and a clean professional interface for trade installs. It supports 1 Heat/1 Cool gas, oil, electric, steam, radiant hot-water, and single-stage heat pump systems (no aux heat), making it ideal for natural-gas or propane furnaces with central AC.  A large 4.09 in² backlit LCD with clearly labeled buttons displays temperatures, Heat-Off-Cool-Auto modes, and Auto/On/Circulate fan settings, and the simple non-programmable design helps prevent scheduling errors in homes, rentals, and light commercial spaces. It delivers ±1°F accuracy from 32–90°F, a configurable low-temperature limit for garage or fringe zones, and reminders for filter, battery, and heat-pump issues to improve comfort, efficiency, and maintenance.  The FocusPRO^® N100 operates from 20–30 VAC at 60 Hz and can be hardwired or battery operated.