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 | Desertcart Saint Kitts and Nevis

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Sold byAmazon Saint Kitts and NevisDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Stay cool, save green, and control your comfort like a boss! 🌿

ANYWHERE ACCESS - Control your home temperature remotely via phone, tablet, or laptop—never come home to discomfort.
SLEEK MODERN DESIGN - Polished metal finish with a vibrant high-res display and Farsight feature that lights up with useful info as you enter the room.
SMART SCHEDULE LEARNING - Automatically adapts to your lifestyle for effortless comfort and savings.
PROACTIVE HVAC MONITORING - Receive real-time alerts and maintenance reminders to keep your heating and cooling systems running smoothly.
ENERGY EFFICIENCY INSIGHTS - Track your energy usage with intuitive Energy History and get rewarded with the Nest Leaf for eco-friendly choices.

The Nest Learning Thermostat (3rd Gen) is a smart, programmable thermostat that learns your schedule to optimize home comfort and energy savings. Compatible with 95% of HVAC systems, it offers remote control via Wi-Fi, voice assistant integration, and proactive system alerts. Its polished metal design and bright display with Farsight make it a stylish, tech-forward addition to any modern home.

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
Best Sellers Rank	#32,706 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #44 in Home Programmable Thermostats
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 4.4 out of 5 stars (6,359)
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	16 ounces
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)
Number of Items	1
Power Source	Battery Powered
Product Style	Thermostat Only
Screen Size	2.1 inches
Shape	Round
Specific Uses For Product	Air conditioning, Heating, Ventilation systems, Heat pumps
Temperature Control Type	Heating, Cooling
UPC	642892801039 813917020203
Unit Count	1 Count
Voltage	24 volts

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