how do you run a secondary 24v transformer to charge your nest? i ran the neutral common to c and tried the power wire in both rc and rh. neither work

No C wire or external transformer needed with this model.

Will this thermostat run a heat pump and a oil burning furnace?

Yes it will. I have a heat pump and oil furnace.

can I replace my old nest (1st or 2nd gen I'm not sure) with the 3rd gen without changing wiring? Or is it totally different?

"Unfortunately, there are key differences between the Nest thermostat bases, and you can’t swap with a different thermostat display without changing the baseplate. Google Nest thermostats look similar, and share similar software, but there are some important differences that you’ll need to know for troubleshooting, installation and more. Visit Google Nest Help page to learn more about the Nest thermostats and technical specifications: Nest thermostat technical specifications: https://support.google.com/googlenest/answer/9230098 How to tell which Nest thermostat you have: https://support.google.com/googlenest/answer/9246551"

From the app of this device, will it transmit the house temperature to my mobile device?

Yes, the thermostat and any temperature sensors you may have installed in your home.

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Nest 3rd Generation learning programmable Thermostat Carbon Black T3016US

Nest 3rd Generation learning programmable Thermostat Carbon Black T3016US

Product ID: 274289519

Details

Brand
Google
Controller type
Remote Control
Model name
T3018US
Product dimensions
8.4D x 8.4W x
Special features
Remote Access

📱Remote Wi-Fi control

🔥12% heating savings

❄️15% cooling savings

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₹ 42409

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Description

🌡️ Elevate your comfort, slash your bills, and stay connected—thermostat redefined.

SAFETY SYNC - Pairs with Nest Protect to shut off furnace if carbon monoxide is detected—peace of mind built-in.
ADAPTIVE LEARNING - Automatically programs your preferred temps for every time and day—effortless comfort.
SMART ENERGY SAVER - Cuts heating bills by up to 12% and cooling by 15%, paying for itself fast.
SEAMLESS INTEGRATION - Works with 95% of HVAC systems and smart assistants like Alexa & Google Assistant.
REMOTE COMMAND CENTER - Control your home's climate from anywhere via smartphone, tablet, or laptop.

The Nest 3rd Gen Learning Thermostat in sleek Carbon Black combines cutting-edge adaptive technology with ENERGY STAR certified efficiency, saving up to 12% on heating and 15% on cooling. Featuring a larger, sharper display and remote Wi-Fi control, it learns your schedule to optimize comfort and energy use. Compatible with most HVAC systems and smart home assistants, it also enhances safety by integrating with Nest Protect to prevent carbon monoxide risks.

Specifications

ASIN	B07KNFSXFV
Additional Features	Auto-Scheduling, Remote Access, Energy Usage Tracking
Backlight	Yes
Best Sellers Rank	#21,908 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #89 in Home Thermostats & Accessories
Brand Name	Google
Color	Black
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	Remote
Control Type	Voice Control
Controller Type	Remote Control, Amazon Alexa, Google Assistant
Customer Reviews	4.4 4.4 out of 5 stars (10,296)
Display Type	digital
Included Components	Display, Base, Nest Pro installation card, Installation And Welcome Guide, Mounting screws and labels, Nest screwdriver, Optional Trim Plate
Item Dimensions D x W x H	8.4D x 8.4W x 2.8H centimeters
Item Type Name	Thermostat
Item Weight	0.5 Pounds
Manufacturer	Nest
Manufacturer Part Number	T3018US
Material Type	Metal
Model Name	T3018US
Model Number	T3018US
Mounting Type	Wall Mount
Number of Batteries	1 Lithium Ion batteries required. (included)
Power Source	Corded Electric
Product Style	Thermostat Only
Shape	Round
Specific Uses For Product	Air Conditioner
Specification Met	energy,reach
Temperature Control Type	Smart/Remote
UPC	813917022023 813917021033
Voltage	24 Volts

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