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Emerson Sensi Wi-Fi Smart Thermostat, ST55 Review
Last updated - March 10, 2026
Verdict overview
- Easy installation 9.8
- Smart Features 8.9
- Temperature Control 9.6
- Tech Support 9.1
- integrate with Alexa 9.3
Pros
Easy DIY installation without a C-wire.- Energy savings with flexible scheduling.
- Comprehensive smart maintenance alerts.
Cons
Possibility of frequent resets.
Tech specs
| screen size | 5 Inches |
| color | White |
| import | Made in the USA |
| assembly required | No |
| backlight | Yes |
| controller type | Amazon Alexa, Google Assistant, SmartThings, Vera |
| included components | Thermostat, free mobile app, 2 AA batteries, mounting hardware, wire stickers, installation guide, welcome guide with Sensi code, warranty booklet |
| warranty description | 3 years. |
| control type | Button Control |
| display type | LED |
| connectivity technology | Wi-Fi |
| connectivity protocol | Wi-Fi |
| global trade identification number | 00786710554827 |
| product dimensions | 1"D x 5.88"W x 3.75"H |
| shape | Rectangular |
| batteries | 1 AAA batteries required. (included) |
| item weight | 13.6 ounces |
| specific uses for product | Air Conditioner, Boiler, Furnace, Heat Pump |
| temperature control type | Programmable, Smart/Remote |
| voltage | 24 Volts (AC) |
| control method | Voice |
| material | Plastic |
| power source | Corded Electric |
| finish types | Glossy |
| finish type | Glossy |
| style | DIY |
| batteries required | Yes |
| mounting type | Wall Mount |
| number of batteries | 1 AAA batteries required. (included) |
Product Overview
I recently purchased the Emerson Thermostats Sensi Wi Fi Smart Thermostat ST55 for my home. It was a great decision that I have not regretted since then. It has been easy to install and I have had no problems using it whatsoever.
The thermostat is ENERGY STAR certified, which means it can help you save energy with features like flexible scheduling, remote access, and usage reports. It also comes with a built in level and step by step app instructions for a quick installation. Whats more, it works with HVAC equipment found in most homes and common wire c wire is not required in most applications.
The Emerson Thermostats Sensi Wi Fi Smart Thermostat ST55 also provides privacy protection as it wont sell your personal information to third parties. It looks and feels like a traditional thermostat so you dont have to patch and paint your walls when installing it. And its temperature control is pretty accurate too!
Furthermore, this thermostat can help monitor the performance and efficiency of your HVAC system by delivering valuable usage reports, alerts about your equipment, and maintenance reminders like filter replacement. You can also configure it with Alexa integration, Google Assistant, SmartThings, Homekit and even Vera for more convenience.
Overall, this product is perfect for those who are looking for an easy to install DIY thermostat that provides great energy savings without compromising on privacy or performance. Its features are top notch and it works well with many HVAC systems found in homes today. I would highly recommend this product to anyone who wants an efficient way to control their homes temperature without any hassle or difficulty.
Frequently asked questions
- What are the benefits of this thermostat?
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