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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🌡️ Stay cool, stay connected, stay ahead!

SMART WI FI CONTROL - Manage your home climate from anywhere with seamless Wi-Fi connectivity.
VIVID COLOR DISPLAY - Stay effortlessly informed with a sleek, modern color touchscreen interface.
PRECISION PROGRAMMABLE - Customize heating and cooling schedules to optimize comfort and energy savings.
MODERN WALL MOUNT DESIGN - Enhance your space with a stylish, matte-finish thermostat that blends with any decor.
ENERGY EFFICIENT OPERATION - Battery-powered with 120V support ensures reliable performance and lower energy bills.

The Honeywell RTH9585WF1004/W is a modern, Wi-Fi enabled smart thermostat featuring a vibrant color touchscreen, programmable heating and cooling schedules, and reliable battery-powered operation with 120V support. Designed for easy wall mounting, it offers professional-grade climate control that fits seamlessly into any contemporary home.

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Brand	Honeywell
Controller Type	Push Button
Special Feature	Programmable
Colour	Grey
Temperature Control Type	Heating, Cooling
Connectivity Technology	Wi-Fi
Power Source	Battery Powered
Voltage	120 Volts
Shape	Rectangular
Display Type	color
Finish Type	Matte
Control Type	Button Control
Control Method	Touch
Connectivity Protocol	Wi-Fi
Mounting Type	Wall Mount
Style	Modern
Backlight	No
UPC	085267911313
Global Trade Identification Number	00085267911313
Country of Origin	China
Item model number	RTH9585WF1004/W
ASIN	B075BF6V58

Honeywell RTH9585WF1004/W Wi-Fi Smart Color Programmable Thermostat, V. 2.0,"C Wire Required

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