Question 1

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?).

Accepted Answer

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.

Question 2

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

Accepted Answer

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.

Question 3

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?

Accepted Answer

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.

Question 4

Do I need to have a Honeywell gateway?  This is an additional piece of hardware used by some of the Honeywell thermostats (ex. Prestige).

Accepted Answer

No need to have a Honeywell gateway for the Honeywell rth6580wf. You only need a wireless Internet modem dsl/broadband service phone line.

ASIN	B00Y6M2OUC
Additional Features	Auto Changeover, Daylight Savings Time Ready, Energy Star certified, Smart Response Technology, Wi-Fi enabled
Backlight	Yes
Best Sellers Rank	#19,504 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #27 in Home Programmable Thermostats
Brand	Honeywell Home
Brand Name	Honeywell Home
Color	White
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	Voice
Control Type	App Control
Controller Type	Amazon Alexa, Google Assistant , Vera
Customer Reviews	4.3 out of 5 stars 15,557 Reviews
Display Type	LED
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	1.5"D x 5.75"W x 3.5"H
Item Type Name	Wi-Fi 7-Day Programmable Thermostat
Item Weight	1 Pounds
Manufacturer	Honeywell Home
Manufacturer Part Number	RTH6580WF1001
Manufacturer Warranty Description	Warranty.
Material Type	Plastic
Model Name	RTH6580WF1001 Wi-Fi Thermostat
Model Number	RTH6580WF1001/W1
Mounting Type	Wall Mount
Number of Batteries	2 AA batteries required.
Power Source	Corded Electric
Product Dimensions	1.5"D x 5.75"W x 3.5"H
Product Style	A. Wi-Fi Thermostat
Shape	Rectangular
Smart Home Compatibility	Smart Home Compatible
Special Feature	Auto Changeover, Daylight Savings Time Ready, Energy Star certified, Smart Response Technology, Wi-Fi enabled Special Feature 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,energy star certified
Temperature Control Type	Heating and Cooling
UPC	085267771955
Unit Count	1.0 Count
Voltage	24 Volts
Wattage	24 watts

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

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