How do I figure out if this will work with my wiring? I read that there might be issues with the electric wires (might be missing one COMMON wire?).

I did the following in a two-wire heat-only setup and it worked: 1) On the back panel of the new thermostat, remove the small jumper between the RC and R connectors. 2) Connect the outputs of a 24V AC transformer (I happened to use https://www.amazon.com/gp/product/B07DJ7RHS5?ref=ppx_pt2_dt_b_prod_image) to the RC and C connectors on the new thermostat back panel. It does not matter which of these two wires goes to RC and which goes to C. 3) Connect the wire that had gone to either RC or R on the old thermostat to the R connector on the new thermostat back panel. Connect the wire that had gone to W on the old thermostat to the W connector on the new thermostat back panel. 4) Plug in the transformer to a nearby 120 V outlet. Snap the body of the new thermostat onto its back panel. Continue with the instructions provided with the new thermostat.

What happens to the room temperature when the internet is down?

If you have no Internet, this thermostat will simply operate as a non-WiFi enabled programmable thermostat (e.g., follow the schedule that you previously created) OR you use the buttons on it to adjust it manually. The only thing you lose with not having the Internet is the ability to use your phone to interact with it (e.g., change the settings and/or update the schedule). Just pretend like it is 1970 and adjust the thermostat like your parents did.

Without battery backup, what happens in a power outage? Is there internal memory that keeps the settings and how long, and is thermostat still usable?

I found this information on another website (http://programmablethermostat.info/honeywell-rth6580wf-wi-fi-7-day-programmable-thermostat/)Real Time Clock:This thermostat does NOT have an internal battery. All program and installer set up functions are saved on to a chip and retained in case of a power outage. It does utilize a super capacitor for short term retention of the clock. If there is a lengthy power outage and if the RTH6580WF is connected to the internet, when power is restored it will automatically resynchronize with the internet time.

ASIN	B00Y6M2OUC
Additional Features	Auto Changeover, Daylight Savings Time Ready, Energy Star certified, Smart Response Technology, Wi-Fi enabled
Backlight	Yes
Best Sellers Rank	#70,735 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #187 in Home Thermostats & Accessories
Brand	Honeywell Home
Brand Name	Honeywell Home
Color	white
Colour	white
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	App
Control Type	App Control
Controller Type	App
Customer Reviews	4.2 out of 5 stars 13,776 Reviews
Display Type	Digital
Finish Types	White
Included Components	Quick reference card, Quick start guide, Screws and anchors, Thermostat, Thermostat ID card, User guide, Wallplate (attached to thermostat), Wire labels
Item Dimensions D x W x H	3.8D x 14.6W x 8.9H centimeters
Item Type Name	Wi-Fi 7-Day Programmable Thermostat
Item Weight	1.2 Pounds
Manufacturer	Honeywell Home
Material Type	Plastic
Model Name	RTH6580WF Wi-Fi Thermostat
Model Number	RTH6580WF1001/W1
Model name	RTH6580WF Wi-Fi Thermostat
Mounting Type	Wall Mount
Number of Batteries	2 AA batteries required.
Power Source	Corded Electric
Product Style	A. Wi-Fi Thermostat
Product dimensions	3.8D x 14.6W x 8.9H centimeters
Shape	Rectangular
Special features	Auto Changeover, Daylight Savings Time Ready, Energy Star certified, Smart Response Technology, Wi-Fi enabled Special features Auto Changeover, Daylight Savings Time Ready, Energy Star certified, Smart Response Technology, Wi-Fi enabled See more
Specific Uses For Product	Air Conditioner, Furnace, Heat Pump
Specification Met	Energy Star
Temperature Control Type	Programmable, remote control
UPC	085267771955
Voltage	24 Volts
Wattage	24 watts

Wi-Fi 7-Day Programmable Thermostat (RTH6580WF), Requires C Wire, Works with Alexa

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