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.

Google Nest Learning Thermostat - 3rd Gen (2015) - Programmable Smart Thermostat for Home - Works with Alexa - White

Google Nest Learning Thermostat - 3rd Gen (2015) - Programmable Smart Thermostat for Home - Works with Alexa - White

Product ID: 35829148

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Details

Brand
Google Nest
Model Name
Nest Learning
Product Dimensions
3.3"D x 3.3"W
Controller Type
Amazon Alexa
Special Feature
802.11b/g/n @

🌿Auto Eco temp saves energy

📱Remote control from anywhere

⚙️HVAC system alerts & monitoring

Description

🌡️ Stay cool, save green, and never miss a beat with Nest!

ANYWHERE ACCESS - Control your home climate from phone, tablet, or voice assistant
SMART SCHEDULE LEARNING - Adapts to your lifestyle for effortless comfort and savings
PROACTIVE HVAC MONITORING - Receive alerts to prevent costly system breakdowns before they happen
ENERGY INSIGHTS AT A GLANCE - Track usage trends and get the Nest Leaf when you save energy
SLEEK DESIGN MEETS FUNCTION - Polished metal finish with a bright Farsight display that welcomes you home

The Google 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 app and voice assistants like Alexa, provides energy usage insights, and proactively monitors your heating and cooling system health. Its elegant metal design and bright display make it a stylish, tech-forward upgrade for any modern home.

Specifications

Brand	Google Nest
Model Name	Nest Learning Thermostat
Product Dimensions	3.3"D x 3.3"W x 1.1"H
Controller Type	Amazon Alexa, Google Assistant, Insteon, Nexia, nest
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
Color	White
Specific Uses For Product	Air Conditioner
Temperature Control Type	Heating
Connectivity Technology	Wi-Fi
Included Components	Base, Display, Installation Guide, Mounting screws and labels, Nest Pro installation card, Nest screwdriver, Optional trim kit, Welcome Guide
Power Source	Battery Powered
Item Weight	16 ounces
Voltage	24 Volts
Material	Metal
Shape	Round
Display Type	Digital
Finish Type	Unfinished
Screen Size	2.1 Inches
Control Type	Voice Control
Control Method	Voice
Connectivity Protocol	Wi-Fi
Mounting Type	Wall Mount
Style	Thermostat Only
Backlight	Yes
Number of Batteries	1 CR2 batteries required. (included)
UPC	642892801039 813917020203
Global Trade Identification Number	00813917020203, 08907758011116
Manufacturer	Google Nest
Part Number	T3017US
Item Weight	1 pounds
Item model number	T3017US
Batteries	1 CR2 batteries required. (included)
Is Discontinued By Manufacturer	No
Size	1
Finish	Unfinished
Item Package Quantity	1
Number Of Pieces	1
Type of Bulb	LED
Switch Style	Touch-Sensitive
Special 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
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Lithium Ion

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