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.
Sensi ST25W ST25W Lite Smart Thermostat, Programmable, WiFi, Easy DIY, Works With Alexa, ENERGY STAR Certified, , Most Systems C-Wire Not Required, C-Wire needed with Heat/Cool Only & Heat Pump System -White
Features
- Easy DIY installation with built-in level
- Works with most HVAC systems
- C-Wire not required for most systems
- ENERGY STAR certified saves about 23% HVAC energy
- Privacy protection, no data selling
- Control from anywhere via mobile app
- Flexible scheduling and geofencing
General specs
- Brand: Sensi
- Model: ST25W
- Seller: Retailer
- ID: B0FXN46XRS
- Model: ST25W
- Geofencing: Yes
- Product Type: Smart Thermostat
- Programmable: Yes
- Remote Access: Yes
- Usage Reports: Yes
- Energy Savings: About 23% on HVAC energy
- Installation Type: Easy DIY, Built-in level
- Mobile App Support: Yes, Android, iOS
- Privacy Protection: Yes, Does not sell personal information
- WiFi Compatibility: Yes
- C-Wire Requirements: Required for heat pump and heat/cool only systems, Not required for most other systems
- Energy Star Certified: Yes
- Voice Assistant Compatibility: Works with Alexa
- First listed by seller: May 27, 2026
If you are interested in more details, you can find full information on the seller's page.
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United States
United States
Available
Designed for the busy homeowner, the Sensi Lite Smart Thermostat puts energy savings and comfort control in your hands. Perfect for someone juggling work and home life, this thermostat lets you adjust temperatures from your phone while you're out. Whether you're heading home early and want a cool house or need to warm up the living room before the kids wake up, remote access makes it happen.
What sets this thermostat apart is its focus on privacy. Your personal data stays yours. Sensi doesn't sell your information or use your usage patterns for ads. That peace of mind pairs perfectly with the energy savings. The flexible scheduling, geofencing, and usage reports help you cut HVAC costs by up to 23%. You get actionable insights without sacrificing your privacy.
Installation is straightforward. The built-in level and step-by-step guide lead you through the process. Common wire (C-wire) is required for heat pump and heat/cool only systems, but not for most other setups. Once installed, you can control the thermostat from anywhere using the top-rated mobile app. It's Alexa compatible, so voice commands work too. This smart thermostat keeps your home comfortable and your energy bills in check.
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| Brand | Sensi | Honeywell Home | ecobee | Amazon Renewed | Amazon | Emerson |
| Model | ST25W | S200 TH2110WF4008 | Essential | ST76 | S6ED3R | ST55 |
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| Price | €80.32 | €70.65 | €53.54 | €121.78 | €50.86 | €102.63 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | May 29, 2026 | Jun 24, 2026 | Jun 24, 2026 | May 20, 2026 | Jun 24, 2026 | Jun 24, 2026 |
| Energy Star Certified | Yes | Yes | Yes | |||
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