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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🌟 Elevate your home’s IQ with color, control, and savings—comfort never looked this smart!

INSIGHTFUL ENERGY REPORTS - Track monthly energy use and get personalized tips to optimize comfort and slash waste—because saving is the new luxury.
EFFORTLESS DIY INSTALLATION - Designed for quick setup with clear instructions and compatibility with most forced air and heat pump systems (C-wire required).
TAILOR YOUR COMFORT PALETTE - Personalize your thermostat’s vibrant touchscreen to match your home’s vibe or mood effortlessly.
SMART SAVINGS SMARTER LIVING - Join utility rebate programs and Demand Response to reduce bills while helping the grid during peak times.
CONTROL FROM ANYWHERE ANYTIME - Seamlessly adjust your home’s temperature via Alexa, Apple Home, or the intuitive mobile app—perfect for busy pros on the move.

The Honeywell Home Wi-Fi Smart Color Programmable Thermostat (RTH9585WF1004) offers a customizable color touchscreen, flexible scheduling, and smart home integration with Alexa and Apple Home. ENERGY STAR certified, it supports most forced air and heat pump systems (requires C-wire), enabling remote control via app and participation in energy-saving utility programs. Its intuitive interface and intelligent alerts ensure peak performance and personalized comfort, making it a must-have for modern connected homes.

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Manufacturer	Honeywell
Model Number	RTH9585WF1004/W
Package Dimensions	53.2 x 20.5 x 7.9 cm
Material	Plastic
Color	gray
Volume	2.16 Fluid Ounces
Size	Pack of 1
Special Features	Customizable color touch screen, smart response technology, Energy Star certified
Power Source	Corded Electric
Voltage	120 Volts
Battery Type	Alkaline
Package Weight	0.02 Kilograms
Batteries Required	No
Batteries Included	No
Brand Name	Honeywell Home

Honeywell Home Wi-Fi Smart Color Programmable Thermostat, Customizable Programming, Alexa and Apple Home Enabled, In-app Programming, Personalized Color Display, Easy Installation, (RTH9585WF1004) 141

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