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(based on 4 ratings)
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Brand: Honeywell
Located in: 1 Heat/1 Cool
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.
More information for the Honeywell VisionPro IAQ Programmable Universal Thermostat with Outdoor Sensor
Review Snapshot®
Avg. Customer Rating:
 
4.3 stars
(based on 4 reviews)
100% of respondents would recommend this to a friend.

Customers most agreed on the following attributes:

Pros:
Easy to adjust(4), Easy to install(4), Intuitive controls(4)
Describe Yourself:
Homeowner(3)
 
You will not be disappointed
By pineymtnvaVerified Purchaser from Charlottesville, VA on 12/28/2009
Pros:
Easy To Adjust, Easy To Install, Intuitive Controls
Best Uses:
Replacement for old unit
Describe Yourself:
Handyman
Bottom Line:
Yes, I would recommend this to a friend

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

This is the third unit of this type I have installed. No greater complement can be had than the service tech installing this unit saying it is great. He has seen a lot and this one is his favorite. It is great especially the humidity control. Don't waste your money on cheap units or really expensive ones. This is a great value for the money. Great company to purchase from as well. [...]

 
Great Product but forget support fm Mfgr
By Ron - Retired Instrument EngineerVerified Purchaser from Kansas City on 12/22/2009
Pros:
Easy To Adjust, Easy To Install, Intuitive Controls, Precise Controls, Versatile Product
Cons:
Factory Support
Best Uses:
Homes, Small Commercial Offices
Describe Yourself:
Handyman, Homeowner
Bottom Line:
Yes, I would recommend this to a friend

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

Tied in AC w/dehum control, 2-stage furnace, dehumidifier, 2nd thermostat in basement, and outdoor temp sensor. Circulate mode for fan with 2nd sensor in basement does a pretty good job keeping the temperature difference between main floor and basement reasonably close.

Biggest problem is Honeywell refusing to talk to anyone but a licensed HVAC technician.

Manual fails to describe how to program dehum contacts for normally open and normally closed settings. To get full functionality for dehum where N.O. contacts reduce AC fan speed and still allow the thermostat to pull temp below the set temperature (up to 3 deg F) for further dehumidification, I will have to add a SPDT relay. The relay will allow me to convert the dehum N.C. contacts to N.O. as required by my Kenmore unit.

 
Good value for integrated controls
By GrayhairVerified Purchaser from Minneapolis, MN on 12/8/2009
Pros:
Easy To Adjust, Easy To Install, Intuitive Controls, Precise Controls
Best Uses:
Central Controls
Describe Yourself:
Homeowner
Bottom Line:
Yes, I would recommend this to a friend

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

I was very impressed on the ability to integrate humidifiers, dehumidification, ERV ventilation and heating. There are plenty of options to use when setting up the controls. It did take a fair amount of time to wire up and check out circuitry Thiswould not be good for an average homeowner without some controls and electrical experience that justs wants to connect 4 wires at the themostat.

[1 of 1 customers found this review helpful]

 
Do it Yourself Capable
By FredVerified Purchaser from Chicago on 2/19/2009
Pros:
Easy To Adjust, Easy To Install, Intuitive Controls
Describe Yourself:
Homeowner
Bottom Line:
Yes, I would recommend this to a friend

Comments about Honeywell 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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