Can you create a fan schedule? I’d like the fan to always run from 10pm until 6am.

Updated Answer: THANK YOU to Albert who pointed out below that the fan can be controlled through SmartThings! It was annoying to have to set up another app and service to do this, but it is a workaround to get around Sensi's frustrating limitation. SmartThings allows you to set the fan to Auto, On, or Circulate (but not the percentage of time to circulate) and automate that on any schedule you want. Unfortunately, Alexa and Google still don't allow you to control the fan at all, even though Sensi's API apparently allows it. Original Answer from June 6, 2020: No, you can't do a schedule like if you want it to run all the time during the night. Also, you can't control the fan from Alexa to schedule it that way. Very annoying and unreasonable that they wouldn't add that option since you can turn it on manually from the app. They do have the auto-circulate feature, but that's not the same.

Is it smart enough to decide whether to run the heater or cooler to keep the temperature fixed?

In spite of the snarky answer above that says that's what a thermostat does, it should be noted that a thermostat doesn't just so that unless it is a feature of the thermostat. A thermostat is for comparing existing ambient temperature to programmed temperature. On a furnace, if the temperature exceeds the programmed temp, the furnace simply will not run. THAT is what a thermostat does. UNLESS there is the ability to set said thermostat to automatically adjust the temp to the programmed temp.

Can you program just the fan mode?

As pointed out on a similar question, the Sensi app does not allow scheduling of the fan mode, but you can do it with a 3rd party integration to the SmartThings app. Unfortunately, Alexa and Google don't have the option to control the fan either, but the SmartThings workaround was good enough for me to set our fan to run automatically at night and turn off in the morning.

What if i have a C wire?

The "C-wire" is the second wire for 24VAC which is used to power advanced thermostats. Older thermostats were just a mercury switch and didn't have a need for additional power supply. Most newer systems are using 5-conductor thermostat wire.. Think of it as the plus side of a DC circuit/battery (but it is AC[thermostats have a rectifier to convert the AC to DC for their use]). Use it and the "common-wire" to supply 24VAC to the thermostat and zone valves/zone dampers. Without it, the thermostat runs on battery all the time and will quickly run down with WiFi. Add a zone controller like a Honeywell HZ311 which has full modern voltages output; i.e., c-wire with 24VAC. This control requires a 24VAC transformer and daisy chains the 24VAC to thermostats and works on older systems since it provides its own c-wire output to advanced thermostats.

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🌡️ Stay cool, save green, and keep your privacy pristine!

PRIVACY FIRST - Your data stays yours—no selling to third parties, guaranteed.
HASSLE FREE SETUP - No c-wire? No problem. Quick install with step-by-step app instructions and built-in level.
EFFORTLESS SMART CONTROL - Manage your home climate remotely via Alexa, Google Assistant, or Apple HomeKit.
ENERGY SAVINGS THAT MATTER - Cut HVAC costs by nearly a quarter with flexible scheduling and usage reports.
PROACTIVE MAINTENANCE ALERTS - Stay ahead with filter reminders and HVAC performance notifications.

The Emerson Sensi Wi-Fi Thermostat is a sleek, energy-efficient smart thermostat designed for easy DIY installation without the need for a common wire in most homes. Compatible with major smart home platforms, it offers remote control, flexible scheduling, and real-time HVAC performance monitoring, helping users save up to 23% on energy costs while ensuring privacy protection.

Presupuesto

Brand	Emerson
Product Dimensions	2.5D x 14.9W x 9.5H Centimeters
Controller Type	Amazon Alexa, Apple HomeKit, Google Assistant, SmartThings
Colour	White
Specific Uses For Product	Air Conditioner, Boiler, Furnace, Heat Pump
Connectivity Technology	Wi-Fi
Power Source	Corded Electric
Item Weight	386 g
Voltage	24 Volts (AC)
Material	Wi
Shape	Rectangular
Screen Size	5 Inches
Control Type	Button Control
Control Method	App, Remote
Connectivity Protocol	Wi-Fi
Mounting Type	Wall Mount
Style	Classic
Backlight	Yes
Number of Batteries	1 AAA batteries required. (included)
UPC	786710554827
Global Trade Identification Number	00786710554827
Manufacturer	Emerson
Model	ST55
Batteries	1 AAA batteries required. (included)
Item model number	ST55
Batteries Included	Yes
Batteries Required	Yes
Does it contain liquid?	No

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