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Honeywell Home C-Wire Adapter for Honeywell home Wi-Fi Thermostats and RedLINK® 8000 Series thermostats THP9045A1098

4.2 4.2 out of 5 stars 3,434 ratings

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Purchase options and add-ons

Brand Honeywell
Model Name THP9045A1098
Product Dimensions 1.75"D x 3.44"W x 5.63"H
Controller Type Hand Control
Special Feature Low Voltage

About this item

  • BEFORE PURCHASING, check to see if the Wi-Fi thermostat you will pair with this adapter is compatible with your home and determine if your home needs a C-wire power adapter. The C-wire adapter should work for all applications in which the thermostat being replaced doesn't have a common wire and does have Y and G wires attached.
  • The C-Wire Power Adapter makes Honeywell Home smart thermostats compatible with most homes that don’t have a common wire.
  • Quickly and easily power connected thermostats that require a c-wire. Easy push terminals and an adhesive mount make installation quick and easy, while the closed cover conceals internal components.
  • Use for Wi-Fi, 24v Honeywell Home thermostats when a common wire is needed but not present. Note, your home may have an unused C-Wire that should be verified before purchasing this adapter.
  • Easy push terminals and an adhesive mount make installation quick and easy.
  • Simple adhesive mount allows you to attach the adapter to the outside of your furnace.
  • COMPATIBLE WITH: Forced air (gas, oil or electric), hot water and steam, and heat pumps with electric backup. Does NOT work with electric baseboard heat (120-240V).

Customer ratings by feature

Alexa integration
4.3 4.3
Easy to install
3.7 3.7
Value for money
3.7 3.7
Adhesion
3.7 3.7

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This Item
Honeywell Home C-Wire Adapter for Honeywell home Wi-Fi Thermostats and RedLINK® 8000 Series thermostats THP9045A1098
Honeywell Home C-Wire Adapter for Honeywell home Wi-Fi Thermostats and RedLINK® 8000 Series thermostats THP9045A1098
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Price-23% $23.23
List:$29.99
-26% $89.26
List:$119.99
-5% $226.45
Typical:$238.97
-24% $136.99
List:$179.99
-10% $89.99
List:$99.99
-24% $136.99
List:$179.99
Delivery
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Customer Ratings
Easy to install
3.7
4.2
4.3
4.3
4.1
4.2
Alexa integration
4.3
3.7
4.0
3.5
3.7
Temperature Control
3.5
4.2
4.6
4.2
3.8
Tech Support
3.4
3.6
3.6
3.0
3.4
Smart Features
3.8
4.7
3.9
Sold By
Amazon.com
EXTEND LLC
Benefitix Market
Dave Parkers
ANR TECH
DirectSupplyClub
control method
application, touch, voice
touch, application
application, touch
application, touch, voice
connectivity protocol
Wi-Fi
Wi-Fi
Wi-Fi
Wi-Fi
Wi-Fi
Wi-Fi
power source
Adapter
Corded Electric
Battery Powered
AC Power Supply
Corded Electric
Electric
controller type
Hand Control
Amazon Alexa, Android, Google Assistant, IFTTT, iOS
Amazon Alexa, Android, Google Assistant, IFTTT, iOS
Amazon Alexa, Apple HomeKit, Google Assistant, iOS, Android
Amazon Alexa, Android, Google Assistant, iOS, IFTTT
specification met
energy,energy star certified
Energy Saving Thermostat, certified frustration-free
Energy Star
Energy Star
material
Plastic
Plastic
Plastic
Plastic

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From the manufacturer

Quickly and easily power connected thermostats

The C-Wire provides a path for continuous power to Wi-Fi thermostats, but often homes are missing this common wire. The C-Wire Power Adapter makes Honeywell Home smart thermostats compatible with most homes that don’t have this wire.

C-Wire Adapter
Do you have a C-Wire?
Before C-Wire Install

Before Installation of C-Wire Adapter

Confirm that you do not have a wire in the C terminal. If you have a wire in the C terminal, then you do not need this product. Look for an unused wire. If you have an unused wire, then you do not need this product. * The C wire (common) might be labeled as B rather than C on certain thermostats.

After C-Wire Install

After Installation of C-Wire Adapter

The C-Wire Adapter allows you to easily add a wire at the equipment during Wi-Fi thermostat installations when a common wire is required – without having to run new wires. Wire is included, so there’s no need to run new wire to the equipment and easy push terminals allow for set-up without tools.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Honeywell

Honeywell Home C-Wire Adapter for Honeywell home Wi-Fi Thermostats and RedLINK® 8000 Series thermostats THP9045A1098


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Product Description

Install a Smart Thermostat Without a C-Wire. The C-Wire provides a path for continuous power to Wi-Fi thermostats, but often homes are missing this common wire. The C-Wire Power Adapter makes Honeywell Home smart thermostats compatible with most homes that don’t have this wire.

Product guides and documents

Important information

Bulb Voltage

24 volts

Customer reviews

4.2 out of 5 stars
4.2 out of 5
3,434 global ratings

Customers say

Customers like how easy it is to install the HVAC control thermostat. They say the instructions are straightforward and the product integrates seamlessly into their furnace setup. However, some customers report issues with the wires. They mention that the wire is pre-labeled, but the product package does not include stickers for labeling the wire. Customers are mixed on value, and performance.

AI-generated from the text of customer reviews

46 customers mention35 positive11 negative

Customers find the installation of the HVAC control thermostat to be pretty simple. They mention that the instructions are straightforward, and the product integrates easily into their furnace setup.

"This device works great. It's easy to connect and use every day.." Read more

"...It was easy to install and much to my suprise worked like a charm." Read more

"Easy to install my only issue was instructions #7 use the provided stickers to label the following connected wires...." Read more

"...The reason is that the installation instructions are terrible. I'm an engineer so I can not imagine what a layman would do...." Read more

48 customers mention29 positive19 negative

Customers are mixed about the performance of the hvac control thermostat. Some mention that it works great with Amazon smart thermostat, while others say that it didn't work.

"This device works great. It's easy to connect and use every day.." Read more

"...I tried for hour plus to get it to work, never got it to work...." Read more

"...It was easy to install and much to my suprise worked like a charm." Read more

"...to a five wire this adapter made my Honeywell thermostat work perfectly without any issues including Auto change over heat and cool, never ever..." Read more

12 customers mention6 positive6 negative

Customers are mixed about the value of the HVAC control thermostat. Some mention that they love the price point, while others say that it's a waste of money and difficult to set up.

"Great value" Read more

"Total trash. Installed exactly to directions. With Alexa thermostat. Turns on ac at same time as furnace...." Read more

"...Good product-does the job-watch the video." Read more

"...Can’t return it now so it was a waste of my money" Read more

6 customers mention0 positive6 negative

Customers dislike the wires in the HVAC control thermostat. They say the wire was pre-labeled, but the package did not include stickers for labeling them. Some customers also mention that the wire is behind the wall and was obviously used at one time.

"...Box damaged mounting tape missing , wires were obviously used at one time." Read more

"Setup was easy, though I'm technically inclined. Did not include stickers for labeling wires, ended up using excess stickers from the Amazon..." Read more

"...However, the wires were pre-labeled, and the piece that is SUPPOSED TO stick to the wall had someone else's wall already stuck to it." Read more

"...out when I fully opened thermostat wires behind the wall.. all extra wires were there. Wish the instructions would have let me know before hand...." Read more

4 customers mention0 positive4 negative

Customers are dissatisfied with the quality of the HVAC control thermostat. They mention that it fried, was faulty, and was defective. Some say that it caused a short and burned through the existing wiring.

"...and required cooling, the thermostat caused a short and burned through the existing wiring and wasn't cooling at all...." Read more

"Had this less than three months and it fried. Our A/C wouldn't work and we had to have an hvac tech come out to check it...." Read more

"Did not work at all.Defective with no way to return.Buy local." Read more

"Did not work. Equip was faulty. Ran to a store and bought a different kind that worked. Amazon won't let me return. Wouldn't buy this." Read more

Works perfectly for Amazon Smart Thermostat
5 Stars
Works perfectly for Amazon Smart Thermostat
I totally tried plugging it into my thermostat for an hour before figuring out that’s not where it goes lol. But I got it figured out and it works for my Amazon smart thermostat
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Reviewed in the United States on March 8, 2024
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5.0 out of 5 stars Works perfectly for Amazon Smart Thermostat
Reviewed in the United States on March 8, 2024
I totally tried plugging it into my thermostat for an hour before figuring out that’s not where it goes lol. But I got it figured out and it works for my Amazon smart thermostat
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