Simple-to-operate, easy-to-read large digital display TSTATG2152-2 2 Heat /1 Cool Heat Pump 5 + 2 day programmable or Non-programmable Auxiliary heat indicator Fahrenheit or Celsius TSTATG2100-2 2 Heat /1 Cool Heat Pump Non-programmable Auxiliary heat indicator TSTATG1152-2 Control up to 1 Heat & 1 Cool Stage Gas/Electric or heat pump (no aux.) 5 + 2 day programmable or Non-programmable Fahrenheit or Celsius TSTATG1100-2 Control up to 1 Heat & 1 Cool Stage Gas/Electric or heat pump (no aux.) Non-programmable Fahrenheit or Celsius