Honeywell Econostat Mechanical Vertical 1 Heat / 1 Cool Thermostat T834N1002

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Meet all current and future mercury-free thermostat compliance needs with Honeywell’s Mercury-Free Econostat. With a sleek, attractive appearance, and the same precision temperature control and reliable performance as the original Econostat, the Mercury-Free Econostat is the perfect electromechanical replacement choice for your home.


  • Integrated thermometer and temperature setting scale.
  • Precise Snap-action switch.
  • Mount directly on wall or outlet box.
  • Includes dealer logo pocket.


This thermostat provides control of 24 Vac single-stage heating and cooling systems.

System Types

  • Gas, oil, or electric heat with air conditioning
  • Warm air, hot water, high-efficiency furnaces, heat pumps, steam, gravity
  • Heat only
  • Heat only with fan
  • Cool only

System Settings

  • Heat, Off, Cool (T834N)
  • Off, Cool (T834L)

Fan Settings

  • Auto, On


Temperature Range

  • 50° to 90°F (10° to 32°C)

Operating Ambient Temperature

  • 0° to 120°F (-18° to 49°C)

Operating Relative Humidity

  • 5% to 90% (non-condensing)

Dimensions (vertical model)

  • 2.88W x 4.75H x 1.5D (inches)
  • 73W x 121H x 38D (mm)

Dimensions (horizontal model)

  • 4.75W x 2.88H x 1.5D (inches)
  • 121W x73H x 38D (mm)

Electrical Ratings

W HEATING 20-30 Vac 0.02-1.2 A
Y COOLING 20-30 Vac 0.02-1.2 A
G FAN 20-30 Vac 0.02-0.6 A
O COOLING CHANGEOVER 20-30 Vac 0.02-0.5 A
B HEATING CHANGEOVER 20-30 Vac 0.02-0.5 A