Google Nest Power Connector - C Wire Adapter for Smart Thermostats - 3.98in Accessory, Snow
Condition: New
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Availability:
In Stock.
Arrives
Saturday, Nov 7
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At a glance
- Condition
- New
- Size
- 1.1 x 3.03 x 3.98 (Pack of 1)
- Style
- Connector
- Model
- GA02493-US
- Color
- Snow
- Material
- Plastic
- Controller Type
- Android, iOS, or Web
- In the box
- Nest Power ConnectorWire connectorsWire labelsSticky padInstallation GuideSafety warranty and regulatory guide
Features 6
- Nest thermostats are designed to work without a C wire in most homes but for some systems, including heating-only, cooling-only, zone-controlled, and heat pump systems, you'll need a Nest Power Connector or C wire.
- The Nest Power Connector is a simple affordable alternative to a C wire if your heating and cooling system requires one to power your Nest Thermostat
- Installation is simple; the Nest Power Connector attaches to your furnace air handler, or zone controller and comes with simple instructions.
- The Nest Power Connector is only compatible with 24 VAC systems; it won't work with millivolt or high voltage systems
- The Nest Power Connector is the Nest thermostat C wire adaptor that's designed specifically for Nest thermostats
- Operating Temperature 22 to 140F (30 to 60C). Made with 46% post-consumer recycled materials.
Description
Nest thermostats are designed to work without a C wire in most homes. But some systems may require a C wire for consistent power to your Nest thermostat. The Nest Power Connector is an affordable C-wire substitute for homes that don't have one. It doesn't require any new thermostat wiring. And with simple instructions you can even install it yourself. If something is wrong with your Nest Thermostat, Google will alert you on-device, through mobile app alerts, and over email.
Specs 32
| Brand | |
|---|---|
| Model Name | GA02493-US |
| Product Dimensions | 7.48"D x 2.1"W x 1"H |
| Controller Type | Android, iOS, or Web |
| Special Feature | C-Wire Substitute |
| Additional Features | C-Wire Substitute |
| Specific Uses For Product | HVAC Systems |
| Temperature Control Type | smart/remote |
| Connectivity Technology | Wi-Fi |
| Voltage | 24 V AC |
| Display Type | color LCD or LED |
| Control Type | Automatic Control |
| Control Method | Touch |
| Connectivity Protocol | Wi-Fi |
| Mounting Type | Furnace/Air Handler/Zone Controller Mount |
| Color | Snow |
| Shape | Rectangular |
| Product Style | Connector |
| Item Dimensions D x W x H | 7.48"D x 2.1"W x 1"H |
| Specification Met | General Industry Standards |
| Brand Name | |
| Model Number | GA02493-US |
| Manufacturer Warranty Description | 1 year manufacturer. |
| UPC | 193575020150 |
| Global Trade Identification Number | 50 |
| Manufacturer | |
| Number of Items | 1 |
| Unit Count | 1 Count |
| Item Type Name | Thermostat Accessory |
| Manufacturer Part Number | GA02493-US |
| Material Type | Plastic |
| Finish Types | Matte Plastic |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Nov 7
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Worked like a Charm!
Size: 1.1 x 3.03 x 3.98 (Pack of 1)
Style: Connector
This connector is awesome! It actually fixed the “Power Issue” notification on my Nest Learning Thermostat 4th gen. We have a 1988 HVAC and the proper C power wire was not installed with the older units. This connector properly gives the thermostat the correct power and seems to running more efficiently then before. Be sure to carefully look up which wires run from your thermostat to the unit as they don’t always match in color!
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Reviewed in the United States on July 17, 2026 by Justin Gunter
No experience but easy install after research & safety precautions
Size: 1.1 x 3.03 x 3.98 (Pack of 1)
Style: Connector
This was my first time touching anything HVAC that’s not a professionally installed thermostat, and doing any electrical wiring at all. Thermostat install was a bit tedious with drywall, drilling, and leveling but straight forward, almost like hanging a tiny painting. Sucked that after install I learned I didn’t have a c-wire, needed one, and didn’t know what an c-wire is… had to figure it out and buy this. Extra $25… ok, annoyed but not mad. This adaptor “power connector” involved significantly more investigation and caution to install versus the thermostat, but once I found the right panel it was a breeze— after that took me literally 5 mins or less with a flat head (to open the furnace) and a Phillips head (to release and reattach the wires) screw driver. Made sure I could find the panel before I placed the order. Very clear and simple directions, immediately resolved the c-wire/power supply issue I was having with my new thermostat, allowing me to use a smart thermostat in my rental home without having to talk to my landlord (plus it all cost under $100 thanks to Amazon “used” options and there’s rebates available from my electricity provider). Literally can’t believe we used to have to switch between heating and cooling in the fall and spring manually… did it at my new place for a few weeks before I decided that it was worth the trouble and expense. Love that I can check and control the temp remotely from my phone. Definitely not mad that I spent the money and got the branded product bc they made it so easy. WiFi works now.
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Reviewed in the United States on October 15, 2025 by A dog
when all else failed this worked perfectly
Size: 1.1 x 3.03 x 3.98 (Pack of 1)
Style: Connector
Once you understand what's going on with the thermostat install and realize why it's not working, you get this and everything just works. I tried everything, expecting to figure it out, but in the end it just would not work. I called tech support to try and understand what this does exactly. Then When I received it, it took two min to install and work. It basically takes the power from the heater and runs it through the red and/or white wire(s) so you don't have to install a third, "c" wire.
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Reviewed in the United States on December 29, 2021 by Frank
Didn't work, had to install C wire
Size: 1.1 x 3.03 x 3.98 (Pack of 1)
Style: Connector
Something is wrong with the Nest Power Connector's internal components, as it tries to deliver power. I'm not sure how it's supposed to work (some kind of switch?), but it does not do the same job as a dedicated C-wire. To preface, we have a baseboard radiator system with an oil furnace and a separate AC system with air handlers. Some thermostats in our house are heat only, others both AC and heat. I installed two Nest Power Connectors, one on a Nest Learning Thermostat 3rd gen and one on a Nest Thermostat. Installation was a breeze. The 3rd gen had previously been using the workaround with a G (fan) wire as a C wire with no power issues. The Nest Thermostat was newly installed. After installation, the Power Connector at the air handler for the Nest Learning Thermostat (heat and ac controller), the unit started having low power issues within 24h (screen not turning on, disconnecting from the temp sensor, wifi disconnecting). Same issue with the Nest Thermostat in the basement (heat only) with the power connector at the HVAC (a Taco 6 zone switch relay board), with power issue error messages showing up on the screen and being emailed within a week. I double checked all the connections with a multimeter, R to W and R to C both had ~27 V, and the Nest itself read enough power coming in. Unfortunately, I had to remove the devices and run a dedicated C wire (not an easy process in our house). Since installation of the C wire, the Nest Learning Thermostat has been working excellently with no issues, indicating that the Power Connector does not do its job as a replacement for an actual C wire. (The other Nest Thermostat still will not work as after a week it had another power issue, and Google Nest support did issue me a replacement device. So it's hard to judge what caused its failure.)
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Reviewed in the United States on December 13, 2021 by Cramer
4th Gen Google Nest Thermostat without C wire on 2nd floor zoned heat and cool worked with adapter
Size: 1.1 x 3.03 x 3.98 (Pack of 1)
Style: Connector
I have purchased 2 4th Gen Google Nest Thermostats for my home with an HVAC system that is older in early 2006. The first floor has wiring to connect all the necessary wires from the HVAC to the Nest thermostat including wire for C wire connection. I didn't have any issues on first floor. The second floor had wiring connections and no extra wire run for C wire connection. The thermostat still functioned but, was always on low power and eventually recently just stopped working with no power. After reading all the reviews about the Google Nest Power Connector with mixed results of it working for some but, not others I decided to try it and purchase it. Worst case I kept my older Thermostats in case I needed it for heating or cooling issues with the new ones as backup. I purchased and installed the Google Nest Power Adapter for the 2nd floor Thermostat that was having the power issues. It was pretty straight forward for my HVAC with the control panel I have and I followed videos on youtube & instructions which helped. It took the 4th gen google nest thermostat couple of minutes to figure out that I had good connection would go from good power to low power to no power cycling through for about a minute. When I tried turning on the cooling system it worked as expected with no longer any power issues. I would recommend trying this as it saved calling an electrician and I am not a DIY electrician so I would have to call one or decide to go with my older setup for the Thermostat having issues. I hope helps this helps others.
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Reviewed in the United States on July 3, 2026 by akuzenka
It works.
Size: 1.1 x 3.03 x 3.98 (Pack of 1)
Style: Connector
Worked perfectly and I was able to avoid running a C power line to the Nest. What' stupid, is how Google doesn't tell you anything about this and the "Smart" thermostat isn't smart enough to know it isn't running your air conditioner? My Gen 4 Nest had no low battery errors, or any messages whatsoever. If you installed a Nest Gen 4, and your compressor pops on, off right after, this is what you need.
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Reviewed in the United States on May 18, 2026 by MattC
A bit redundant
Size: 1.1 x 3.03 x 3.98 (Pack of 1)
Style: Connector
I purchased this for my Nest Thermostat, as my furnace only has the R and W wires, thinking this would somehow remedy the lack of a C wire. After reading the instructions for my specific scenario, the Nest document suggested I get another 24VAC transformer , which is what my existing furnace has. I put my thinking hat on and looked into converting my existing furnace transformer into a C, W and R model, vs buying an additional W and R transformer. The C wire supplies steady power, and the existing transformer does the same thing, why not just daisy chain it to the W terminal I thought. Did some more digging and you can in fact do that. In my case, there were 3 wires running into the building already, so I did the daisy chaining at the furnace. If it was just 2 wires, daisy chain the W wire to C at the thermostat. Will be returning it as it's more gimmicky than functional. If you have to buy a 24vac transformer, might as well buy a plug in one and you won't need the Power connector.
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Reviewed in the United States on February 1, 2025 by Yaki
A Nestessity if you can’t C a cable
Size: 1.1 x 3.03 x 3.98 (Pack of 1)
Style: Connector
See what I did there?… Having bought a Nest thermostat (which installed easily and worked great), I found the installed battery failed after about a year. Replacing the battery in the Nest Learning Thermostat is *not* easy and requires dismantling the thermostat body. When the battery failed, it lost the WiFi connection on account of no power. My A/C guy noted that the circuit doesn’t have a C wire. This wire provides power to the thermostat and without it the thermostat has to rely entirely on the batteries. He offered to run a C wire from the furnace control panel, but that would require a lot of work and a substantial amount of money. This power connector is a much better way. It easily installs at the furnace control panel and basically allows the other wires to provide what musicians call in a microphone “phantom power” to the thermostat. Problem solved. For way less than running a cable through the walls.
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Reviewed in the United States on January 4, 2025 by Malicorneus