What is the difference between the 'pro' kit and the 'diy' kit?

Sensi Support told me that only the professional HomeKit versions have a circulating fan feature. This was important for me because I live in a two story house and in summer the downstairs will be cool, while the upstairs is hot. The circulating fan will move cool air upstairs even when the AC unit is not running. Here is their exact message that was sent to me "Thank you for contacting Sensi Support. The circulating fan feature is only available on professional HomeKit models: 1F87U-42WF and 1F95U-42WF."

Which model allows you to control the temperature differential or cycle rate?

ST55 does, but I do not utilize.

can it control AC and heat

Yes it does control AC and heat. We love ours and we have a few friends & family who also have purchased one and are very happy.

Does anyone have issues with thermostat batteries. The most i get out a set of AA is 2 weeks?

The WiFi is draining your batteries AND you do not have the C wire connected. The C wire (blue) is 24VAC (one leg of it). If you turn off WiFi, the thermo will run for months on the batt as a dumb thermo and NO schedule. If you don't need WiFi, get the non-WiFi version which has the schedule built into the memory of the thermo. What Emerson needs is a model with WiFi AND the schedule in the device's memory. The WiFi is hokey because if WiFi is "lost", there is no access to the schedule! AND I HAVE lost WiFi in the middle of winter and woke up in a very chilly house at 3AM...

ASIN	B01NB1O9YE
Backlight	Yes
Batteries	2 AA batteries required. (included)
Batteries required	Yes
Battery type	Rechargeable lithium-ion battery included.
Best Sellers Rank	#113,447 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #185 in Home Programmable Thermostats
Brand	Emerson
Color	White
Connectivity Protocol	Wi-Fi
Connectivity Technology	Wi-Fi
Control Method	Voice
Control Type	Button Control
Controller Type	Amazon Alexa, Apple HomeKit, Google Assistant, SmartThings, Vera
Customer Reviews	4.3 4.3 out of 5 stars (408)
Display Type	Digital
Global Trade Identification Number	00786710553981
Included Components	Thermostat, free mobile app, 2 AA batteries, mounting hardware, wire stickers, installation guide, welcome guide with Sensi code, warranty booklet
Is Discontinued By Manufacturer	No
Item Weight	11.8 ounces
Item model number	1F87U-42WF
Manufacturer	Emerson Thermostats
Material	Plastic
Model Name	Wi-Fi Thermostat for Smart Home, Pro Version
Mounting Type	Wall Mount
Number of Batteries	2 AA batteries required. (included)
Number of pieces	1
Power Source	Corded Electric
Product Dimensions	1"D x 5.88"W x 3.75"H
Shape	Rectangular
Special Feature	Auto-Scheduling
Specific Uses For Product	Heat Pump
Specification Met	Energy Star
Style	Pro
Temperature Control Type	Remote
UPC	696498759706 786710553981
Voltage	24 Volts
Warranty Description	5 years with professional installation.

Sensi Emerson Wi-Fi Smart Thermostat for Smart Home, Pro Version, Works with Alexa, Energy Star Certified

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Common Questions