does nest need a c wire

Only if you want it to work for more than a year. The instructions and folks here will tell you the c wire isn't required, but I have found that that is not really true. Sure, it will work for 6 to 12 months, but then the battery will die. You can then try charging it with a USB cable but the first time you do that you will get a couple days more use from it. After that, it won't last long enough to work. And, if you try to replace the battery there's a good chance that won't work, either and, if you are lucky enough to still be under warranty, it voids your warranty. My 2nd nest has just failed and rather than buy a 3rd, or pay an electrician to add a c wire, I am going to replace it with a much less expensive honeywell.

does this work with 220v

NO, a not. Google Nest is not designed for 220v electrical-baseboard heating systems, and attempting to connect it to such a system will destroy the unit. However, if your baseboard system is boiler/steam-heated, it WILL work with those, since those are still a low-voltage system that simply opens & closes a valve to regulate temperature. On a side note, it is utterly dreadful just how poor the quality other answers here are. Do people honestly not know what 220v is in relation to heating? Folks, simply enough, if you don't know the answer, then DON'T respond.

How does it detect when you're home? If we're gone and kids are home with a babysitter, will it know someone's home? Or is it based on cell location?

If you add Nest Protect smoke/CO detectors, the system will also use their motion detectors to sense if you're home. This can be useful if the thermostat is located somewhere that doesn't get much foot traffic or if you spend long hours in another room.

Can the Nest replace my current Nexia thermostat ?

You will have to get a wiring diagram to see if nest is compatible.

Nest T3017us Nest Learning Thermostat 3rd Generation

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

HK$4156

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

Description

🌍 Stay smart, save energy, and control your comfort—because your home should work as hard as you do.

SLEEK MODERN DESIGN - Polished metal finish with a vibrant 2.1-inch high-res display and Farsight feature that lights up with weather, time, or temperature as you enter.
SMART ENERGY SAVINGS - Automatically programs to your schedule, saving up to 12% on heating and 15% on cooling—because comfort shouldn’t cost the earth.
REMOTE CLIMATE CONTROL - Adjust your home’s temperature from anywhere via phone, tablet, or laptop—stay in control even when you’re out of office.
PROACTIVE HVAC MONITORING - Receives real-time alerts for HVAC issues and maintenance reminders, protecting your investment before problems arise.
SEAMLESS SMART HOME INTEGRATION - Works effortlessly with Alexa, Google Assistant, and Nest Temperature Sensors for personalized comfort and voice-activated convenience.

The Nest Learning Thermostat (3rd Gen) is a smart, programmable thermostat that learns your schedule to optimize heating and cooling, saving energy and money. Featuring dual-band Wi-Fi, voice control compatibility, and HVAC system monitoring, it offers remote temperature management and proactive maintenance alerts. Its polished metal design with a bright display and Farsight technology enhances any modern home, while supporting 95% of heating and cooling systems for easy installation.

Specifications

ASIN	B01MXC366M
Additional Features	802.11b/g/n @ 2.4GHz, 5GHz a/b/g/n, Wireless Interconnect: 802.15.4 @ 2.4GHz, Bluetooth Low Energy, Working Wi-Fi connection
Backlight	Yes
Best Sellers Rank	#23,689 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #31 in Home Programmable Thermostats
Brand	Google
Brand Name	Google
Color	White
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	Voice
Control Type	Voice Control
Controller Type	Amazon Alexa, Google Assistant, Insteon, Nexia, nest
Customer Reviews	4.4 out of 5 stars 32,663 Reviews
Display Type	Digital
Finish Types	Unfinished
Global Trade Identification Number	00813917020203, 08907758011116
Included Components	Base, Display, Installation Guide, Mounting screws and labels, Nest Pro installation card, Nest screwdriver, Optional trim kit, Welcome Guide
Item Dimensions D x W x H	3.3"D x 3.3"W x 1.1"H
Item Type Name	Nest Learning Thermostat, 3rd Generation
Item Weight	1 Pounds
Manufacturer	Google Nest
Manufacturer Part Number	T3017US
Material Type	Metal
Model Name	Nest Learning Thermostat
Model Number	T3017US
Mounting Type	Wall Mount
Number of Batteries	1 Lithium Ion batteries required. (included)
Power Source	Battery Powered
Product Dimensions	3.3"D x 3.3"W x 1.1"H
Product Style	Thermostat Only
Screen Size	2.1 Inches
Shape	Round
Smart Home Compatibility	Smart Home Compatible
Special Feature	802.11b/g/n @ 2.4GHz, 5GHz a/b/g/n, Wireless Interconnect: 802.15.4 @ 2.4GHz, Bluetooth Low Energy, Working Wi-Fi connection Special Feature 802.11b/g/n @ 2.4GHz, 5GHz a/b/g/n, Wireless Interconnect: 802.15.4 @ 2.4GHz, Bluetooth Low Energy, Working Wi-Fi connection See more
Specific Uses For Product	Air conditioning, Heating, Ventilation systems, Heat pumps
Temperature Control Type	Heating, Cooling
UPC	642892801039 813917020203
Unit Count	1.0 Count
Voltage	24 Volts

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Pooja R.

The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

1 week ago

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

View all Trustpilot reviews

HK$4156

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.