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 ST25 ST25 Smart Thermostat
Features
- Save about 23% on HVAC energy
- Control from anywhere with mobile app
- Easy DIY installation with built-in level
- Privacy protection with no data selling
- Works with Alexa and Wi-Fi
- Common wire not required on most systems
General specs
- Brand: Emerson
- Model: ST25
- Seller: Retailer
- ID: B0BXZ6KXGG
- Connectivity: Wi-Fi
- Power Source: Wired
- Control Methods: App
- Programmable Schedule: Weekly
- Voice Assistant Compatibility: Alexa
- First listed by seller: November 9, 2025
If you are interested in more details, you can find full information on the seller's page.
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Shipping options
Delivery to 
United States
United States
Available
For the homeowner tired of high energy bills and complicated setups, the Sensi Lite Smart Thermostat simplifies climate control. While many focus on smart features, we emphasize data privacy—your comfort settings stay yours, never sold for ads, giving you true peace of mind.
Install it yourself in minutes with the built-in level and clear instructions, avoiding costly technician visits. The app lets you adjust temperatures remotely, so you can cool your home before arriving on a hot day. Geofencing and flexible scheduling cut HVAC energy use by about 23%, putting money back in your pocket. It works with Alexa for voice commands and fits most systems without a C-wire, making upgrade easy.
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| Brand | Emerson | Honeywell Home | Emerson | |||
| Model | ST25 | RENEWRTH8800WF/U | 3rd Gen | ST75W | GA01334-US | G4CVZ |
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| Price | €62.01 | €69.87 | €232.04 | €223.12 | €62.43 | €104.86 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | Jun 24, 2026 | Jun 24, 2026 | Jun 24, 2026 | May 19, 2026 | Jun 24, 2026 | Jun 24, 2026 |
| Connectivity | Wi-Fi | Wi-Fi | Wi-Fi | Wi-Fi | Wi-Fi | Wi-Fi |
| Power Source | Wired | Hardwired | Hardwired | Wired | ||
| Control Methods | App | App, Remote Control | Touchscreen, App | App, Manual, Voice | App, Voice | |
| Programmable Schedule | Weekly | 7-Day | Weekly | |||
| Voice Assistant Compatibility | Alexa | Alexa, Google Assistant | Google Assistant | |||
When this device makes sense
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