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.

Manufacturer	Honeywell Home
Part number	RTH6580WF1001
Item Weight	544 g
Product Dimensions	14.92 x 3.81 x 8.89 cm; 544.31 g
Batteries	2 AA batteries required.
Item model number	RTH6580WF1001/W1
Size	3.5 x 5.75 x 1.5 (H x W x D) inches
Color	white
Style	A. Wi-Fi Thermostat
Finish	White
Material	Plastic
Pattern	Solid Color
Shape	Rectangular
Power source type	Corded Electric
Voltage	24 Volts
Wattage	24 watts
Item Package Quantity	1
Number Of Pieces	1
light-source-type	LED
Display Style	Digital
Plug Profile	Wall Mount
Specification met	Energy Star
Special Features	Auto Changeover, Daylight Savings Time Ready, Energy Star certified, Smart Response Technology, Wi-Fi enabled
Specific uses	Air Conditioner, Furnace, Heat Pump
Included components	Quick reference card, Quick start guide, Screws and anchors, Thermostat, Thermostat ID card, User guide, Wallplate (attached to thermostat), Wire labels
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Lithium

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

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