> Honeywell VisionPro IAQ Programmable Universal Thermostat with Outdoor Sensor

Honeywell VisionPro IAQ Programmable Universal Thermostat with Outdoor Sensor

Honeywell VisionPro IAQ Programmable Universal Thermostat with Outdoor Sensor

About This Thermostat

MFG: Honeywell
MFG#: YTH9421C1010
Our#: 173447
Programmable: Yes (7 day or non-programmable)
Stages: 4H & 2C
System Compatibility: Multi-Stage, Heat Pump, Single Stage, Heat Only
Power Options: 24 VAC Hardwire
Heat/Cool Changeover: Automatic or Manual
Programmable Fan: Yes
Temperature Limits: Yes
Keypad Lockout: Yes
Backlight: Yes
Vacation Hold: Yes
Honeywell VisionPro IAQ Programmable MultiStage Thermostat with Total Home Comfort  - Includes Outdoor Temperature Sensor (YTH9421C1010)

. Contains all features of standard VisionPRO, except arm chair programming.
. Thermostat connects with Equipment Interface Module to control temperature, humidification, dehumidification and ventilation from a single point in the home. Only 3 wires run from thermostat to equipment interface module (EIM), making retrofitting an old thermostat a snap!
. Can control whole house humidifier and automatically raises humidity levels throughout all rooms in the home, moisturizing air to prevent symptoms of dryness and to protect hardwood flooring and woodwork.
. Can control whole house dehumidifier, and automatically lowers humidity levels through al rooms in the home, utilizing air conditioning or a whole house dehumidifier to prevent dampness, stickiness or odors; symptoms often associated with air that is too moist.

Application - Conventional and Heat Pump systems
Programmability - Universal Programming from 7 Day to Non-Programmable
Changeover - Auto or Manual
Color - Premier White®
Switch Positions (System) - HEAT-OFF-COOL-AUTO-EM.HEAT
Switch Positions (Fan) - AUTO-ON-CIRC
Power Method - Power supplied by EIM
Terminal Designations - 1, 2, 3, C, R, Rc, Rh, R, W1-O/B, W2-Aux, W3-Aux2, Y, Y2, G, L, Out1, Out2, In1, In2, Dats1, Dats2, Hum1, Hum2, Dhm1, Dhm2, Vnt1, Vnt2
Dimensions (in.) - 4 9/16 in. high x 6 in. wide x 1 1/4 in. deep
Dimensions (mm) - 116 mm high x 152 mm wide x 32 mm deep
Electrical Ratings - 20 to 30 Vac
Setting Temperature Range (F) - Heat: 40 F to 90 F; Cool: 50 F to 99 F
Setting Temperature Range (C) - Heat: 4.5 C to 32 C; Cool: 10 C to 37 C
Differential Temperature (F) - ± 1 F
Differential Temperature (C) - ±0.5 C
Stages - Up to 4 Heat/2 Cool
Outdoor Sensor - Yes, optional
Discharge Sensor - Yes, optional
Remote Sensor - Yes, optional
Sensor Element - Thermistor
Currents (Heating) - 1.0 A running
Currents (Cooling) - 1.0 A running
Currents (Fan) - 0.6A running
Operating Humidity Range (% RH) - 5 to 90% RH, non-condensing
Includes TH9421C1004 Thermostat and THM5421C1008 Equipment Interface Module and C7089U-1006 Outdoor Sensor
Comments - Includes Humidification Control with or without Frost Protection, Dehumidification using Whole House Dehumidifier or Air Conditioning with High or Low speed fan, Advanced Patented Ventilation Control and Advanced Dual Fuel Heat Pump Control.
Humidification Setting Range - 10 to 60% RH.
Dehumidification Setting Range - 40 to 80% RH. Price:


Regular $479.00, You Save $236.05 (49%)
In Stock


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by PowerReviews
Honeywell VisionPro IAQ Programmable Universal Thermostat with Outdoor Sensor

(based on 11 reviews)


of respondents would recommend this to a friend.


  • Easy to adjust (11)
  • Easy to install (9)
  • Intuitive controls (9)
  • Simple controls (7)


    Best Uses

    • Central controls (8)
    • Home (8)
      • Reviewer Profile:
      • Homeowner (10), Avid do-it-yourselfer (7)

    Reviewed by 11 customers

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    (1 of 1 customers found this review helpful)


    Do it Yourself Capable

    By Fred

    from Chicago

    About Me Homeowner

    Verified Buyer


    • Easy To Adjust
    • Easy To Install
    • Intuitive Controls


      Best Uses

        Comments about Honeywell VisionPro IAQ Programmable Universal Thermostat with Outdoor Sensor:

        great tool for the house and very simple to complete an install. It's very easy to test and make sure you did it right. I made a few wiring mistakes at first. Walking through the test procedures you'll know right away.

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