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Honeywell YTHx9421R5127WW Prestige 2-Wire IAQ Kit with high definition color touchscreen white front/white sides thermostat with RedLINK technology

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Package Weight:
2.60 LBS
Calculated at Checkout


Honeywell YTHX9421R5127WW Prestige 2-Wire IAQ Kit with high definition color touchscreen white front/white sides thermostat with RedLINK technology

Includes: THX9421R5021WW Prestige 2-Wire IAQ Thermostat, THM5421R1021 Equipment Interface Module, THM6000R7001 RedLINK Internet Gateway and 2 Duct Sensors


  • Thermostat
  • Type 7 Day Programmable, Non-Programmable
  • Cover Type Rectangular
  • Color White (Front/Side)
  • Voltage Rating 18 to 30 Volt AC at 50/60 Hertz
  • Temperature Rating 32 to 120 Deg F
  • Size 4-1/2 Inch Width x 7/8 Inch Depth x 3-1/2 Inch Height
  • Changeover Auto/Manual
  • Stage 3-Heat/2-Cool (Conventional), 4-Heat/2-Cool (Heat Pump)
  • Switch Position Heat-Off-Cool-Auto-EM Heat (System), Auto-On-Circ-Follow-Schedule (Fan)
  • Operating Humidity Rating 5 to 90 Percent RH (Non-Condensing)
  • Power Method Hardwired
  • Includes THX9421R5021WW Prestige 2-Wire IAQ Thermostat, THM5421R1021 Equipment Interface Module, THM6000R1002 RedLINK Internet Gateway and (2) Duct Sensor
  • Application Heat Pump
  • Control Heating, Cooling and IAQ Equipment with Only 2-Wires at the Thermostat
  • Heating, Cooling and IAQ Equipment Wires to the Equipment Interface Module
  • Smart Schedule Programs in Seconds for Any Lifestyle
  • Patented Interview Based Programming and Installer Setup
  • RedLINK™ Wireless Communication
  • Selectable for Residential and Light Commercial Application
  • Meets Commercial Code and is Title 24 Compliant
  • Light Commercial Language (Occupied and Unoccupied), Schedule Holidays and Custom Events, Remote Setback, Economizer and Time of Day
  • Delta T Alerts and Diagnostics Informs Customers when their System is Not Performing as Expected with Instructions to Contact the Dealer
  • Provides a Sense of Security and Greater Comfort while Generating Repeat Business
  • Precise Temperature Control (+/- 1 Deg F) for Reliable and Consistent Temperature
  • Multiple Staging Options to Provide Comfort or Energy Saving

Resources & Documents


Manufacturer's Website

Safety Information

California Proposition 65 Warning SymbolWARNING: Cancer and Reproductive Harm -
This product and other products on our site may contain a chemical known to the state of California to cause cancer or birth defects or other reproductive harm. Visit the state of California's website to learn more about Proposition 65.

Many of our items should be installed by a trained HVAC technician. With purchase of this item, you are agreeing to follow any and all safety guidelines provided by the manufacturer and to have the item installed by a trained HVAC technician as necessary. Your professional installer assumes all responsibility for injury or property damage that may result.

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Warranty & Returns

The items we offer on our website are professional grade products that are designed and built to be installed by licensed, professional tradesmen. Because of the professional install these products carry a longer warranty, different than found in similar products offered by big box stores for do it yourselfers. We encourage you to be a licensed HVAC contractor or to hire a Licensed HVAC contractor to be sure you can truly get the manufacturer's warranty. Many manufacturers will request a copy of the contractor license or a bill of install to start the warranty procedure. HVAC Wholesale Direct is a distributor and is not responsible for labor claims, supplies or refrigerant cost recovery or rejected manufacturer's warranty due to misapplication or for operating outside the terms of a manufacturer's warranty.

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30-Day Hassle-Free Return Policy
After 30 days, we will still accept returns but with a 15% Restocking Fee for up to 90 Days

Return terms and conditions: Item(s) must be new and unused in the original packaging with all original documentation included.

Upon receipt of the returned item(s) an inspection will be performed to ensure the above terms and conditions have been met.
If they have, we will issue a refund back to the original method of payment used at time of sale, less our original cost of shipping. If the terms and conditions have not been met, we will contact you to arrange for the items to be returned to you at your expense.

You are responsible for return shipping costs.
We recommend you insure the shipment against loss or damage. Any return shipping damage claims will be your responsibility.

Return Instructions - Non Damage Items

You must ...

  • Request a return via our Contact Us link
  • Include your order / invoice number
  • Provide a reason for your return request
  • State if you want a replacement or a refund

Once we receive your request, we will respond with either an authorization to return, or deny the request with an explanation. If the request is authorized, we will also provide instructions on how and where to return the purchase. Upon receipt of the item(s) back, an inspection will be performed to determine if the item(s) can be returned to the shelf or not. If they can, we will comply with your request for a replacement item(s) or a refund. Refunds will always be issued back to the method of payment used for the original purchase. If the item(s) can not be returned to the shelf for resale, they will be returned to you at your expense.

Items Damaged During Shipment

Occasionally, items are damaged in shipment. It is the buyer's responsibility to inspect for damage upon receipt from the shipping / delivery company. It's best to refuse the delivery and notate the damage on the driver's bill. It's always best to take a picture and let us know, so we can make arrangements to get you a replacement as quickly as possible. Once you accept the shipment, any damage claims at that time are between the delivery company and the buyer. We inspect every item / shipment for damage prior to tendering the items to the delivery company.

Defective Items

If your reason for returning the item in the instructions above is due to a manufacturer defect, you must state that in your return request, as it will affect the instructions for returning the item. Many manufacturers have specific procedures that must be followed in order to process these claims. A detailed description of the defect must be provided. You may be asked to provide additional information such as, a service ticket showing the diagnosis from a licensed HVAC professional, pictures of the defect, etc. These additional pieces of information will help to expedite the process in many cases. Some manufacturers will not proceed without that additional information.

HVAC Wholesale Direct vendor network is made up of some of the finest manufactures of HVAC products. We will be here to assist you. We however, do not have any control over the manufacturers and their warranty practices and make no claim on honoring warranty on behalf of any manufacturer. HVAC Wholesale Direct is not responsible for shipping or freight charges for any warranty claims made that we are helping to facilitate. We issue credit after we receive credit from the manufacturer.

Electrical Parts

Electrical parts, such as capacitors, contactors, transformers, and thermostats are NON-ReturnABLE. HVAC Wholesale Direct is not liable for improper selection and/or installation of electrical parts and controls.

At the end of the day we are people doing business with people in a modern environment. We want you to be happy with your experience with our company. We promise to work with all of our customers, within good reason, to resolve any conflicts, whether defective or mis-ordered to your satisfaction.

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7 Day Programmable, Non-Programmable
Cover Type:
White (Front/Side)
Voltage Rating:
18 to 30 Volt AC at 50/60 Hertz
Temperature Rating:
32 to 120 Deg F
4-1/2 Inch Width x 7/8 Inch Depth x 3-1/2 Inch Height
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