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.

Brand	Honeywell Home
Model Name	RTH6580WF1001 Wi-Fi Thermostat
Product Dimensions	1.5"D x 5.75"W x 3.5"H
Controller Type	Amazon Alexa, Google Assistant, Vera
Special Feature	Auto Changeover, Daylight Savings Time Ready, Energy Star certified, Smart Response Technology, Wi-Fi enabled
Color	White
Specific Uses For Product	Air Conditioner, Furnace, Heat Pump
Temperature Control Type	Heating and Cooling
Connectivity Technology	Wi-Fi
Included Components	Quick reference card, Quick start guide, Screws and anchors, Thermostat, Thermostat ID card, User guide, Wallplate (attached to thermostat), Wire labels
Power Source	Corded Electric
Item Weight	1.2 Pounds
Voltage	24 Volts
Material	Plastic
Shape	Rectangular
Display Type	LED
Finish Type	White
Control Type	App Control
Control Method	Voice
Connectivity Protocol	Wi-Fi
Mounting Type	Wall Mount
Style	A. Wi-Fi Thermostat
Backlight	Yes
Specification Met	energy,energy star certified
Wattage	24 watts
Number of Batteries	2 AA batteries required.
UPC	085267771955
Manufacturer	Honeywell Home
Part Number	RTH6580WF1001
Item Weight	1.2 pounds
Item model number	RTH6580WF1001/W1
Batteries	2 AA batteries required.
Is Discontinued By Manufacturer	No
Size	3.5 x 5.75 x 1.5 (H x W x D) inches
Finish	White
Pattern	Solid Color
Item Package Quantity	1
Number Of Pieces	1
Type of Bulb	LED
Special Features	Auto Changeover, Daylight Savings Time Ready, Energy Star certified, Smart Response Technology, Wi-Fi enabled
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Lithium
Description Pile	Rechargeable lithium-ion battery included.
Warranty Description	Warranty.

Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat, White

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