No C Wire Options
Compare no-C-wire smart thermostats by power method: included adapters and extenders, battery power, and the line-voltage systems to rule out.
Emerson ST55 Smart Thermostat, Wi-Fi, Programmable, Works With Alexa, Energy Star Certified
Product details
General specs
- Brand: Emerson
- Model: ST55
Starting from €102.63
Last price update: 10/3/26
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| Brand | Emerson | Emerson | Sensi | Amazon | Emerson | Amazon |
| Model | ST55 | ST25 | ST25W | S6ED3R | ST75W | |
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| Price | €102.63 | €62.01 | €80.32 | €50.86 | €223.12 | €82.43 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | Jun 24, 2026 | Jun 24, 2026 | May 29, 2026 | Jun 24, 2026 | May 19, 2026 | Jun 19, 2026 |
| Connectivity | Wi-Fi | Wi-Fi | Wi-Fi | Wi-Fi | ||
| Control Methods | App | App, Voice | Touchscreen, App | App, Voice | ||
| Voice Assistant Compatibility | Alexa | Works with Alexa | Alexa | Alexa, Google Assistant | Alexa | |
| Smart Home Platform | Google Home | Google Home | Google Home | |||
When this device makes sense
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