Question 1

What is the difference between this model and older rth9580wf?

Accepted Answer

I contacted Honeywell about this. This is their response:
"RTH9585 is a newly launched model with a slightly different user interface than RTH9580WF.

Also, RTH9585WF has an additional feature of temporary schedule changes wherein you can adjust the Wake, Leave, Return or Sleep periods based on special requirements such as when you wish to activate return period earlier than usual or when you wish to delay the sleep period."

Question 2

does this thermostat requires "C" wire?

Accepted Answer

In an HVAC system there is a step-down transformer that takes the 240VAC or 120VAC and steps it down to 24VAC. The primary side of the 24VAC is what has always been connected the R terminal of a thermostat. The secondary side of the 24VAC transformer was not. It is this secondary side of the 24VAC that is needed by newer thermostats. In fact the newer thermostats are powered by the 24VAC. That secondary side is what is connected to the C terminal. If your cable has a spare unconnected wire. It could be connected to the secondary of the transformer and then to the C terminal. To see if it is there but but not connected, us a VOM and set for AC Voltage, put one lead on the R terminal, and the second lead to each unconnected wire(s), one at a time. if it shows 24VAC +/- 4VAC, you found the secondary side. All other wires will show OC or open. That secondary side wire is the C wire

Question 3

Does this thermostat have a screen lock to prevent guest from tampering with the settings?

Accepted Answer

Yes, upper and lower limits can be set. Couldn't find anything online to see how to adjust. Chatted with customer service.  The thermostat needs to be unlocked.  Then press settings in the upper right of the main screen, Scroll down to preferences, and choose advanced preferences. Press next until the temperature limits screen.  Adjust.  Limits apply to all three modes unlocked, partially, and fully locked.

Question 4

How does this sense the outside temp and humidity?

Accepted Answer

It displays outside temp and humidity, but these are local weather conditions from the internet, not sensors at your house.

ASIN	B075BF6V58
Additional Features	Customizable color touchscreen, Smart Response Technology, Energy Star certified
Best Sellers Rank	#2,169 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in Home Programmable Thermostats
Brand Name	Honeywell Home
Color	Gray
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	Voice
Control Type	Touchpad Control
Controller Type	Touch Screen, Voice
Customer Reviews	4.3 4.3 out of 5 stars (20,078)
Display Type	LED
Finish Types	Standard D. Grey
Global Trade Identification Number	00085267911313
Included Components	Mounting Hardware, Thermostat, Thermostat ID Card, User Manual, Wire Labels
Item Dimensions D x W x H	0.88"D x 4.5"W x 3.5"H
Item Type Name	Honeywell Home Wi-Fi Smart Color Programmable Thermostat, Alexa Enabled, (RTH9585WF1004)
Item Weight	7.2 ounces
Manufacturer	Honeywell Home
Manufacturer Part Number	RTH9585WF1004
Manufacturer Warranty Description	1 year warranty.
Material Type	Plastic
Model Name	RTH9585WF1004
Model Number	RTH9585WF1004/W
Mounting Type	Wall Mount
Number of Batteries	1 AAA batteries required.
Number of Items	1
Power Source	AC Power Supply
Product Style	D. Grey - Wi-Fi Thermostat
Shape	Rectangular
Specific Uses For Product	Furnace
Specification Met	Energy Star
Temperature Control Type	Heating and Cooling
UPC	085267911313
Unit Count	1 Count
Voltage	120 volts

RTH9585WF Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready, C-Wire Required, Not Compatible with Line Volt Heating Gray

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