Emerson Sensi ST55 Smart Thermostat - Wi-Fi, Programmable, Works With Alexa
✨ Upgrade your home with the Emerson Sensi ST55 Smart Thermostat ✨
Ever wished your thermostat was as smart as your phone? Well, now it can be. The Emerson Sensi ST55 is a breeze to install yourself—no common wire needed, and it plays nice with most HVAC systems. Plus, it’s not just smart; it’s thrifty, too. Think 23% energy savings thanks to flexible scheduling and a mobile app that’s so good, it’s practically showing off.
And here’s something you don’t hear every day: Privacy Protection. That’s right, Sensi keeps your data to itself, no selling to third parties. Because your thermostat shouldn’t be gossiping about your heating habits.
It’s also got your back with Smart Maintenance. Imagine getting a nudge when it’s time to change your filter or if your HVAC starts acting up. Handy, right?
Compatibility? Check. Whether you’re team Alexa or Google Assistant, this thermostat fits right in. Voice control isn’t just cool—it’s downright lazy (in the best way).
And because we’re all trying to save the planet (and our wallets), it’s Energy Star Certified. Lower bills and a smaller carbon footprint? That’s what we call a win-win.
General specs
- Brand: Emerson
- Model: ST55
- Seller: Amazon
- Product Dimensions: 1"D x 5.88"W x 3.75"H
- Controller Type: Vera, Google Assistant, Amazon Alexa, SmartThings
- Special Features: Filter Indicator, Clock Display, Fan Control, Auto Changeover, Daylight Savings Time Ready
- Specific Uses For Product: Boiler, Air Conditioner, Heat Pump, Furnace
- Temperature Control Type: Programmable, Smart/Remote
- Connectivity Technology: Wi-Fi
- Included Components: Thermostat, free mobile app, 2 AA batteries, mounting hardware, wire stickers, installation guide, welcome guide with Sensi code, warranty booklet
- Power Source: Corded Electric
- Item Weight: 13.6 ounces
- Voltage: 24 Volts (AC)
- Material: Plastic
- Shape: Rectangular
- Display Type: LED
- Screen Size: 5 Inches
- Control Type: Button Control
- Control Method: Voice
- Connectivity Protocol: Wi-Fi
- Mounting Type: Wall Mount
- Style: DIY
- Backlight: Yes
- Number of Batteries: 1 AAA batteries required. (included)
- Warranty Description: 3 years.
- First listed by seller: 3/30/25
If you are interested in more details, you can find full information on the seller's page.
Buy on Amazon
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Shipping options
United States
Comparison with similar products
| This item | Recommendations | |||||
|---|---|---|---|---|---|---|
Emerson ST55 White
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Emerson ST76 Works with room sensors
|
Smart Wi-Fi Thermostat White Wi-Fi connectivity
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ecobee EB-STATE6L-01 Black
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Google Thermostat
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Smart Thermostat White Precise temperature control
|
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| Brand | Emerson | Emerson | 3d printing machine | ecobee | Fishine | |
| Model | ST55 | ST76 | EB-STATE6L-01 | Thermostat | ||
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| Rating |
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| Price | $83.99 | $154.99 | $77.91 | $184.00 | $99.98 | $59.23 |
| Seller | Amazon | Amazon | Joom | Amazon | Amazon | Joom |
| Update | July 20, 2025 | July 19, 2025 | August 18, 2025 | August 5, 2025 | August 5, 2025 | August 19, 2025 |
Smart Thermostat, Wi-Fi, Programmable, Works With Alexa, Energy Star Certified
Sophie R.
Leicester
April 8, 2025
As a logistics specialist, I'm all about efficiency, and this thermostat has been a game-changer for managing my home's climate. I bought it to cut down on energy costs and stay eco-friendly, and it's delivered on that front. Installation was a snap—I did it in under an hour with no issues, and it arrived right on time, which I always appreciate. Using the app, I can tweak settings from my phone, whether I'm at the gym or work, and the voice control is just so convenient for those lazy moments. The privacy aspect is a huge plus; I don't have to worry about my data being shared, which matters a lot to me. Fitness and health are big for me, so having a comfortable home environment helps with recovery and well-being. Overall, it's extremely helpful, but not perfect—hence the four-star rating. I'd recommend it to others looking for a smart, budget-friendly upgrade.
- Pros: I absolutely loved how easy it was to set up myself—no need for any special wiring, which saved me a ton on installation costs. The app is extremely intuitive and lets me control the temperature from anywhere, which is perfect for my busy schedule. It works seamlessly with my voice assistant, making adjustments a breeze, and I appreciate the energy savings; my bills have already dropped noticeably. The maintenance alerts are a lifesaver, reminding me when to change filters before things get messy.
- Cons: A couple of niggles: sometimes the app can be a bit slow to respond, and I wish the scheduling options were more flexible for my irregular routine. Also, while it's great for saving energy, it could be wrong in extreme weather, as it doesn't always adapt perfectly to sudden temperature changes. The design is a bit plain, and I'd prefer something more modern-looking for my home.