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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Honeywell Home Wi-Fi Smart Color Programmable Thermostat, Alexa Enabled, (RTH9585WF1004), Gray, Pack of 1

Honeywell Home Wi-Fi Smart Color Programmable Thermostat, Alexa Enabled, (RTH9585WF1004), Gray, Pack of 1

Product ID: 85539689

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Details

Brand
Honeywell Home
Model name
RTH9585WF1004
Controller type
touch app
Special feature
Customizable
Colour
Grey Or White
Specific uses for product
Furnace

⚡Energy Star certified, smart savings

🌈Customizable color touchscreen

📱Wi-Fi & app remote control

Description

🌟 Upgrade your comfort game with color, control, and savings!

EFFORTLESS SCHEDULING - Flexible 7-day programming adapts to your lifestyle and peak utility pricing for optimized savings.
CONTROL ANYWHERE ANYTIME - Manage your home’s temperature remotely via smartphone or tablet app for ultimate convenience.
VOICE ENABLED CONVENIENCE - Alexa compatibility lets you adjust settings hands-free, keeping comfort at your command.
SMART SAVINGS REAL REWARDS - Unlock energy rebates and ongoing incentives by syncing with your utility provider’s programs.
TAILOR YOUR COMFORT STYLE - Personalize your thermostat’s color to seamlessly blend with your home décor and mood.

The Honeywell Home Wi-Fi Smart Color Programmable Thermostat (RTH9585WF1004) offers a customizable touchscreen interface, remote control via app, and Alexa voice compatibility. Energy Star certified, it supports flexible scheduling and integrates with utility rebate programs to maximize energy savings. Designed for various heating systems (excluding electric baseboard heat), it combines smart technology with stylish personalization for modern homes.

Specifications

Manufacturer	Honeywell Home
Part Number	RTH9585WF1004
Product Dimensions	8.89 x 11.43 x 2.24 cm; 204.12 g
Item model number	RTH9585WF1004/W
Size	Pack of 1
Colour	Grey Or White
Style	B. Grey - WiFi Thermostat
Finish	Matte
Material	Plastic
Shape	Rectangular
Power Source	AC Power Supply
Voltage	120 Volts
Item Package Quantity	1
Number of Pieces	1
Display style	touchscreen
Plug profile	Wall Mount
Certification	Energy Star
Special Features	Customizable color touchscreen, Energy Star certified, Smart Response Technology
Usage	Furnace
Included Components	Thermostat, Wall Plate, Screws, Anchors, Quick Start Guide, Thermostat ID Card, Wire Labels, User Guide
Batteries included?	No
Batteries Required?	No
Battery Cell Type	Alkaline
Item Weight	204 g

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