Does this have the capability of showing me a temperature chart of the past 12 hrs?

Not sure what you mean. The temperature for the past hours will be what the thermostat is set for, no? It does give you a monthly report of number of hours in use, number of hours of heating and/or cooling, and average humidity...

What is difference between this thermostat and the white wifi version.

Please visit https://sensicomfort.com/ for additional product details. The Sensi Touch Wi-Fi (ST75) has a color touch-screen, requires a c-wire in all applications, and is compatible with Apple HomeKit among other home automation platforms such as Amazon Alexa. Sensi Wi-Fi Thermostat models UP500W and 1F86U-42WF do not have color touch-screens, and a c-wire is not required for most HVAC applications. While not compatible with HomeKit, these models are compatible with other smart home platforms including Amazon Alexa. Sensi Wi-Fi Thermostat models ST55 and 1F87U-42WF are similar to previous models (UP500W/1F86u-42WF), except these models are compatible with HomeKit. Feel free to reach out to support@sensicomfort.com for any other questions.

Is this product able to control whole home humidifiers?

It controls my Aprilaire 800 just fine

Can you use the temperature schedule on the unit, and also apple homekit geofencing to get the benefits of both rather than either or?

I have geofencing on my setup AND I can also turn on scheduling. Not sure why u can’t do both. If u have any smart devices set up in ur home, then see if u can set up a schedule there instead of the Sensi app, then just turn on geofencing in the Sensi app. Worked for me. Alexa allows me to do schedules on the thermostat even when I have geofencing on in the Sensi app. I love this thermostat. Much better than the Nest that just takes everything over & is difficult to navigate & is so much more expensive. Nest has also have threatened & planned to stop being compatible with Alexa & Apple pods anymore due to the competition, to force people to change to the Google assistant, which would make it worthless to anyone using Alexa or other non-google smart devices. I bought two nests for family members,& one for myself that I couldn’t get to install in my home, but for me, this one does what I want but doesn’t tell ME how I can use it and what smart devices I can use it with. It works with ALL smart home setups. And it was super easy to set up. I can already see the energy savings I’m gonna get with this cause my thermostat is staying exactly at the temp I chose & it’s not running all day anymore. Get this one, I think you’ll like it!

Item Weight	15.2 ounces
Item Dimensions D x W x H	1.17"D x 5.63"W x 3.2"H
Control Type	App Control
Control Method	Voice
Connectivity Protocol	Wi-Fi
Mounting Type	Wall Mount
Backlight	Yes
Connectivity Technology	Wi-Fi
Power Source	Common wire
Voltage	24 Volts
Display Type	LCD
Controller Type	Vera, Apple HomeKit, Google Assistant, Amazon Alexa, SmartThings
Special Features	Filter Indicator, Geofence Technology, Auto Changeover, Daylight Savings Time Ready, Programmable
Specific Uses For Product	Boiler, Air Conditioner, Heat Pump, Furnace
Temperature Control Type	Heating, Cooling
Shape	Rectangular
Style	White
Color	White
Material	Plastic

EMERSON Sensi Touch Wi-Fi Smart Thermostat with Touchscreen Color Display, Works with Alexa, Energy Star Certified, C-wire Required, ST75W , White

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