View on Amazon
Smart Thermostat Staging Guide
Compare smart thermostats by HVAC stage support: single-stage basics vs W2/Y2 and 2H/2C multi-stage picks, plus variable-speed system caveats.
Emerson ST55U Smart Wi-Fi Thermostat: Smart Wi-Fi connectivity
You want lower energy bills without sacrificing comfort. The Emerson Sensi ST55U Smart Wi-Fi Thermostat makes it easy. It learns your home's unique schedule and adjusts the temperature automatically, so you're not cooling an empty house. The intuitive app lets you change settings from anywhere – perfect for coming home to a comfortable space after work.
Installation takes about 30 minutes with the built-in level and step-by-step guide. The bright white display is easy to read, even in low light. Plus, it works with Alexa and Google Assistant for hands-free voice control. You'll see savings on your monthly bill without thinking about it. Get the comfort you want and the control you need.
Features
- Energy-saving scheduling
- Easy DIY installation
- Compatible with most systems
- Remote control via app
- Smart Wi-Fi connectivity
General specs
- Brand: Emerson
- Model: ST55U
- Seller: Amazon
- ID: B09LVVW53Y
- Type: Smart Wi-Fi Thermostat
- Brand: Emerson
- Model: Sensi ST55U
- Weight: ~0.004 lbs
- Dimensions: ~1.1 x 4.5 x 4.5 feet
- Display Type: Touchscreen
- Power Source: Hardwired
- Compatibility: Smart Home Systems
- Temperature Range: 40°F to 99°F
- : Yes
- First listed by seller: April 27, 2026
If you are interested in more details, you can find full information on the seller's page.
Amazon live offers
?
Top live offer is the offer currently shown first for this Amazon listing. It may differ from the lowest available price.
FBA means the order is fulfilled by Amazon, even when the seller is a third-party merchant.
Shippable means the offer is listed as available for delivery on Amazon.
New, Used and Refurbished describe the item condition shown for that Amazon offer.
Top live offer
€89.98
Free shipping
New
Third-party seller
FBA
Shippable
New from
€89.53
Only from New + Shippable live offers
New offers
Third-party seller
· FBA · Shippable
€89.98
Third-party seller
· FBA · Shippable
€89.53
Third-party seller
· FBA · Shippable
€139.34
Third-party seller
· FBA · Shippable
€139.34
Third-party seller
· Shippable
€139.35
Offers updated: 9/1/26
Affiliate link. As an Amazon Associate I earn from qualifying purchases.
Price History for seller Amazon
Shipping options
Delivery to 
United States
United States
Available
Similar products comparison
| This item | Recommendations | |||||
|---|---|---|---|---|---|---|
Emerson ST55U White Smart Wi-Fi connectivity
|
Nest Smart Thermostat Fog Programmable WiFi thermostat
|
Honeywell Th6220wf2006 Smart thermostat
|
Smart Thermostat for House Wide compatibility with 4 Heat/2 Cool
|
Honeywell RTH9580WF Wireless wifi connectivity
|
Braeburn 7205 White Programmable scheduling
|
|
| Brand | Emerson | GCP | Honeywell | Braeburn | ||
| Model | ST55U | Th6220wf2006 | RTH9580WF | 7205 | ||
| Color |
|
|
|
|||
| Rating |
|
|
|
|
|
|
| Price | €89.98 | €57.03 | €128.96 | €68.87 | €128.33 | €57.68 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | Jun 24, 2026 | May 29, 2026 | Jun 19, 2026 | Jun 24, 2026 | Jun 24, 2026 | Jun 24, 2026 |
| Compatibility | Smart Home Systems | Furnace, Boiler, Heat pump, Residential HVAC systems | Apple iOS, Android | |||
Emerson ST55U White Smart Wi-Fi connectivity
€89.98
Affiliate link. As an Amazon Associate I earn from qualifying purchases.
When this device makes sense
Product confidence
Reviews
There are no text reviews yet. If you have experience using this product, please leave a review. It will help other people decide whether this product is right for them.