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  • Honeywell YTH9421C1002 Visionpro IAQ Touch Screen 7-Day Programmable Thermostat, Version 2
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Honeywell YTH9421C1002 Visionpro IAQ Touch Screen 7-Day Programmable Thermostat, Version 2

11 customer reviews
| 4 answered questions

List Price: $516.58
Price: $241.40 ($241.40 / EA) & FREE Shipping
You Save: $275.18 (53%)
Only 9 left in stock.
Ships from and sold by Plumbing Planet.
  • Enter your model number above to make sure this fits.
  • Advanced dual-fuel control
  • Three wires to the living space allows for easy equipment upgrade without having to run additional thermostat wire
  • Thermostat connects with Equipment Interface Module or EnviraZONE panel to control temperature, humidification, dehumidification and ventilation from a single point in the home
  • Automatically raises humidity levels throughout all rooms in the home, moisturizing air to prevent symptoms of dryness and to protect hardwood flooring and woodwork
  • Removes air pollutants by exchanging the stale air in a house with fresh, filtered air better than having an open window
See more product details
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Frequently Bought Together

Honeywell YTH9421C1002 Visionpro IAQ Touch Screen 7-Day Programmable Thermostat, Version 2 + Honeywell C7089U1006 Outdoor Temperature Sensor
Price for both: $268.17

These items are shipped from and sold by different sellers.

Buy the selected items together

Product Description

Product Description

Overview The Honeywell TH9421U touch screen universal programmable thermostat provides electronic control of 24 Vac heating and cooling systems of 750 mV heating systems in addition to humidification dehumidification and ventilation. Features Contains all features of standard VisionPRO, except arm chair programming. Thermostat connects with Equipment Interface Module or EnviraZone panel to control temperature, humidification, dehumidification and ventilation from a single point in the home. Automatically raises humidity levels throughout all rooms in the home, moisturizing air to prevent symptoms of dryness and to protect hardwood flooring and woodwork. Automatically lowers humidity levels through all 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. Removes air pollutants by exchanging the stale air in a house with fresh, filtered air better than having an open window.

From the Manufacturer

The VisionPRO IAQ touch screen universal programmable thermostat provides electronic control of 24 Vac heating and cooling systems in addition to humidification, dehumidification and ventilation all with just 3 wires to the thermostat.


Product Information

Technical Details
Part Number YTH9421C1002
Item Weight1 pounds
Product Dimensions4.5 x 7.5 x 4.5 inches
Item model numberYTH9421C1002
ColorWHITE
ShapeCurved
Power SourceHardwired
Item Package Quantity1
Display StyleDigital
  
Additional Information
ASINB00155K3ZG
Best Sellers Rank #104,873 in Home Improvement (See top 100)
Shipping Weight1.6 pounds (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First AvailableFebruary 29, 2008
  
Warranty & Support

Product Warranty: For warranty information about this product, please click here
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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

2 of 2 people found the following review helpful By Anthony Kempka on November 29, 2013
Verified Purchase
Very nice product that controls all my air quality equipment & furnace: ERV air exchanger, humidifier, and of course the furnace itself. The unit can be programmed to run the furnace fan (air handler) in conjunction with the air exchanger and will also control the humidifier to turn on in several ways (only when furnace heat is on, any time regardless of furnace heat, with and without running the furnace fan). This unit will also circulate air throughout the house on a random timer basis to keep the air fresh when heat, humidity or air exchange isn't called for. Very nice unit. Fairly easy to program. Only complaint (the reason for 4 stars instead of 5) is that the LCD panel does not show when the individual air appliances are running (i.e., no indicators for air exchanger, humidifier, air circulation or even when it calls for heat from the furnace).
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1 of 1 people found the following review helpful By razor02097 on December 3, 2013
Verified Purchase
I bought this thermostat to replace my mercury lever style on my heat pump system. NOTE you will need 3 wires to interface the thermostat with the relay box unit. I used 3 of the existing 5 wires on my setup and just taped up the other 2. The instructions that came with this thermostat aren't very good... it shows you what would go where but just looking at the relay box unit would tell you that much... Mine did not come with programming instructions either... I had to use Google to find out how to program the thermostat to work with my heat pump. All said and done I am happy with the performance.

So why would one buy this? If you have a simple heating and cooling system you aren't going to recoup the cost. However if you require a smarter thermostat because you have a complex HVAC system this thermostat will do the job. You can interface many heat sources and program the thermostat to use them the most efficient way possible. You can hook up stages for cooling also. The thermostat has options to hook up humidifier, dehumidifier, vent fans, and remote temp sensors. I wish it came with the outdoor temp sensor... turns out it is almost necessary if you have an electric heat pump so you don't burn it up when it is below freezing outside.
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1 of 1 people found the following review helpful By Brian on December 13, 2013
Verified Purchase
The EIM still worked but eventually this failed. If you buy the new one be warned. It reminds you to replace the face plate behind the thermostat. But it doest warn you to watch if the order of the wires had changed. Back of the new thermostat shows first is dats and second two are R and C. Originally it was R, C, Data on the one I previously has.. It just calls them 1,2,3 and isn't tricky unless you figured it was the same which it may not be.

I hope the new one lasts longer. Has good humidity control including frost control if you have outside thermostat option.
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1 of 1 people found the following review helpful By Dan on December 11, 2013
Verified Purchase
Awesome! Tons of features and programing capabilities ... I had to put a humidifier in my new house and just put this same thermostat in my old house so I knew what I wanted. I found a HVAC guy who installed it all for me in a couple of hours and saved a bit of money since I bought the stuff .. only thing they couldn't cover it if it broke but I have a warranty anyways right? lol You will like it and can add more features later if you want to.
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1 of 1 people found the following review helpful By FWSTL on March 11, 2014
Verified Purchase
It is easy to install because it only needed three wires. It is also easy to program. The humidity setting is why I bought it so I do not have to adjust the humidity setting as the outside temperature changes.
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Verified Purchase
Installed by HVAC contractor with a new furnace and A/C so I can't comment on ease of installation. It's easy to use and does what I ask it to - and price here on Amazon was very good. No complaints at all.
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