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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🌟 Upgrade your comfort game with color, control, and savings in one sleek smart thermostat!

ENERGY INSIGHTS REWARDS - Track monthly energy use, get personalized tips, and qualify for utility rebates and demand response rewards.
TAILOR YOUR COMFORT PALETTE - Personalize your thermostat’s color to match your style and home decor effortlessly.
SEAMLESS VOICE APP CONTROL - Works flawlessly with Alexa, Apple HomeKit, and Google Home for hands-free temperature management anywhere.
SMART SCHEDULING SMARTER SAVINGS - Flexible programming adapts to your lifestyle and utility peak rates to maximize energy savings.
DIY FRIENDLY WITH INTUITIVE TOUCHSCREEN - Bright, easy-to-read touchscreen and simple installation make upgrading your home comfort a breeze.

The Honeywell Home Wi-Fi Smart Color Programmable Thermostat (RTH9585WF1004) offers a customizable color touchscreen, flexible scheduling, and seamless integration with Alexa and Apple HomeKit. ENERGY STAR certified, it helps reduce energy consumption with smart alerts, monthly reports, and eligibility for utility rebates. Designed for easy DIY installation, it supports most forced air and heat pump systems, delivering personalized comfort and remote control from anywhere.

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Manufacturer	Honeywell
Model Number	RTH9585WF1004/W
Package Dimensions	23.1 x 18.5 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	0.45 Kilograms
Batteries Required	No
Batteries Included	No
Brand Name	Honeywell Home
Item Weight	204 g

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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