Question 1

does nest need a c wire

Accepted Answer

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.

Question 2

does this work with 220v

Accepted Answer

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.

Question 3

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?

Accepted Answer

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.

Question 4

Can the Nest replace my current Nexia thermostat ?

Accepted Answer

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

ASIN	B07KNFSXFV
Additional Features	Daylight Savings Time Ready
Best Sellers Rank	#39,840 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #48 in Home Programmable Thermostats #108 in Home Nonprogrammable Thermostats
Brand Name	Google
Color	Mirror Black
Connectivity Protocol	Wi-Fi
Connectivity Technology	Bluetooth, Wi-Fi
Control Method	Voice
Control Type	Voice Control
Controller Type	Amazon Alexa, Google Assistant, nest
Customer Reviews	4.4 4.4 out of 5 stars (2,530)
Display Type	LCD
Included Components	All
Item Dimensions D x W x H	3.3"D x 3.3"W x 1.21"H
Item Type Name	Google
Item Weight	8 ounces
Manufacturer	Google
Manufacturer Part Number	T3018US
Material Type	Metal
Model Name	Nest
Model Number	T3018US
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
Shape	Round
Specific Uses For Product	Air Conditioner
Specification Met	energy,reach
Temperature Control Type	Heating, Cooling
UPC	813917022023 813917021033
Unit Count	1 Count
Voltage	24 volts

Nest Learning Thermostat 3rd Generation, White, Works with Amazon Alexa

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