What is the difference between this model and older rth9580wf?

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."

does this thermostat requires "C" wire?

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

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

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.

How does this sense the outside temp and humidity?

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

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HoneywellHome RTH9585WF1004 Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready

HoneywellHome RTH9585WF1004 Wi-Fi Smart Color Thermostat, 7 Day Programmable, Touch Screen, Energy Star, Alexa Ready

Product ID: 46398170

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Details

Brand
Honeywell Home
Model Name
Product Dimensions
0.88"D x 4.5"W
Controller Type
Touch Screen
Special Feature
Customizable

⚡Energy Star certified efficiency

🎨Customizable full-color touchscreen

📶Wi-Fi 2.4GHz connectivity

Description

🌡️ Upgrade your comfort IQ with smart style and savings!

VIBRANT TOUCHSCREEN DISPLAY - Customizable color touchscreen with clear, easy-to-read numbers and local weather updates.
ENERGY SAVING SMART RESPONSE - Energy Star certified with Smart Response Technology that learns your habits to optimize comfort and reduce bills.
PERSONALIZED CLIMATE CONTROL - 7-day programmable schedule adapts to your lifestyle and utility peak pricing for max savings.
PROACTIVE MAINTENANCE ALERTS - Stay ahead with intelligent reminders for filter changes, humidifier pads, and temperature warnings.
SEAMLESS SMART HOME INTEGRATION - Works effortlessly with Alexa, Google Home, SmartThings, and IFTTT for voice & app control.

The Honeywell Home RTH9585WF1004 is a sleek, Energy Star certified Wi-Fi thermostat featuring a customizable full-color touchscreen, 7-day programmable scheduling, and compatibility with major smart home platforms like Alexa and Google Home. It offers intelligent alerts and Smart Response Technology to optimize your home's heating and cooling efficiently, all controlled via voice or app for modern convenience.

Specifications

Brand	Honeywell Home
Model Name	RTH9585WF1004/W
Product Dimensions	0.88"D x 4.5"W x 3.5"H
Controller Type	Touch Screen, Voice
Special Feature	Customizable color touchscreen, Energy Star certified, Smart Response Technology
Color	Gray
Specific Uses For Product	Furnace
Temperature Control Type	Heating and Cooling
Connectivity Technology	Wi-Fi
Included Components	thermostat
Power Source	AC Power Supply
Item Weight	0.45 Pounds
Voltage	120 Volts
Material	Plastic
Shape	Rectangular
Display Type	LED
Finish Type	Standard D. Grey
Control Type	Touchpad Control
Control Method	Voice
Connectivity Protocol	Wi-Fi
Mounting Type	Wall Mount
Style	B. Grey - WiFi Thermostat
Backlight	No
Specification Met	Energy Star
UPC	085267911313
Global Trade Identification Number	00085267911313
Manufacturer	Honeywell
Part Number	RTH9585WF1004
Item Weight	7.2 ounces
Item model number	RTH9585WF1004/W
Is Discontinued By Manufacturer	No
Size	Pack of 1
Finish	Standard D. Grey
Item Package Quantity	1
Number Of Pieces	1
Special Features	Customizable color touchscreen, Energy Star certified, Smart Response Technology
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Alkaline
Warranty Description	1 year warranty.

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