This product has been discontinued.

The manufacturer has discontinued this product permanently. Please see the alternative product below.

4 Heat/2 Cool Programmable Pro1 IAQ Thermostat

Item: HA12726
Model: T855i
Condition: New

4 Heat/2 Cool Programmable Pro1 IAQ Thermostat Zoom

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Pro1 IAQ

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Warranty Terms

For a full description of all warranties applicable to this product as well as individual manufacturer requirements, please review the manufacturer's consumer brochure and/or product warranty documents.  Online warranty registration must be completed within 60 days of installation.  Due to state laws, online registration is not required in California or Quebec. Call for warranty availability on scratch & dent and surplus items.

For additional warranty information, click here.


Model T855i
Product Height (in) 4.4
Product Length (in) 1.1
Product Width (in) 4.7
Special Features WiFi Capable
System Compatibility AC Only, AC & Gas, Heat Pump, Dual Fuel
Thermostat Mobility Stationary
Heat/Cool Stages 4 Heat / 2 Cool
Thermostat Type Programmable
Weight (lbs) 2.0000
California Residents see Prop 65 WARNING


Q & A

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How to lock the screen so others not to be able keep changing the thermostat? Also can I Contorl it with an app?I have T 855I. Thank you so much
Can I use this thermostat on a home boiler heating system? If so, how hard is it to connect. I have one on a home but not a boiler and we just purchased a lake house. That has the boiler.