The Lennox 51M34 is a digital, programmable thermostat that can automatically switch between heating and cooling modes. It is part of the ComfortSense 3000 Series and has a backlit display and large rubber buttons for easy operation. The 51M34 also has the following features:
  • Dual-fuel capability
  • Works with advanced heating and cooling systems
  • Reliable performance
  • 5/2 day programmability
  • Push-button user interface
  • 24v voltage
  • Wired power method
  • Programmable filter-change reminder
  • Equipment maintenance reminder
  • System check indicator