Pro1 IAQ T855S 3-H, 2-C Thermostat
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Pro1 IAQ T855S 3-H, 2-C Thermostat


Retail: $130.99 /ea
You Save: 15%
As low as
Retail: $130.99
You Save: 15%
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The Pro1 IAQ T855S Universal 3-H, 2-C Thermostat is a Single Stage 3-Heat, 2-Cool device that features 7 day or 5-1-1 program functions. Not only does the T855S feature a dynamic 8-in display, it also includes a convenient filter change indicator setting, separate heating and cooling swing (cycle rate) adjustments, and intuitive wake, leave, return, sleep programming icons.

Other features include 2 AA Energizer or Duracell batteries, keypad lockout, and heating and cooling setpoint limits. This thermostat is recommended for gas or electric heating/cooling systems only.


  • Brand: Pro 1 IAQ
  • Part Number: T855S
  • Pack Size: 1
  • Dimensions: 4.7"W x 4.4"H x 1.1"D
  • Single Stage
  • 3 Heat, 2 Cool
  • 7 Day or 5/1/1 progammable
  • Intuitive wake, leave, return, sleep programming icons
  • Extra large, easy-to-read temperature display
  • Auto Changeover
  • 8 sq. inch display
  • Blue backlight
  • Glow in the dark light button
  • Programmable fan
  • Electric or Gas configurable
  • Separate B & O terminals
  • Separate heating and cooling swing (cycle rate) adjustments
  • Room temperature calibration adjustment
  • 5 minute compressor delay protection (selectable on or off)
  • Filter change indicator (selectable on or off)
  • Keypad lockout
  • Heating and cooling setpoint limits
  • Simple private label badge system
  • Easy wire color coded terminal blocks
  • Universal sub-base
  • Mounts on wall or junction box
  • Battery or 24v power

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