Emerson Sensi ST55
Score: 72/100
Mysa Smart Thermostat
Score: 74/100Rankings
Mysa's Smart Thermostat V2 is a line-voltage Wi-Fi thermostat designed for electric baseboard and similar heaters, delivering up to 26% energy savings with precise temperature and humidity alerts. Its compatibility is limited to electric heating systems and it lacks battery backup and Bluetooth, restricting broader use cases. Perfect for homeowners upgrading electric heating with smart controls and zoning capabilities.
Emerson Sensi ST55 provides a 5-inch LED touchscreen, broad smart-home compatibility, and geofencing-driven energy savings, all at an affordable price. Limitations include the need for a C-wire, 2.4 GHz-only Wi-Fi, and lack of built-in room sensors. Ideal for DIY homeowners seeking a versatile, budget-friendly thermostat.
| Attribute | | |
|---|---|---|
— | 0.28 °Cbest | |
3 yearsbest | 2 years | |
5 inchbest | — | |
| ↓ lower better | 0.386 kgbest | 0.51 kg |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
General(2) | ||
HVAC Compatibility | Various (single to multi-stage) | Electric baseboard, convector, radiant ceiling, self-contained hydronic baseboard |
Warranty (years) | 3 years | 2 years |
Connectivity(2) | ||
Wi‑Fi Standard | 802.11 a/b/g/n (2.4GHz) | 2.4 GHz |
Smart Home Integration | Alexa, Google Assistant, Apple HomeKit, Samsung SmartThings | Apple HomeKit, Amazon Alexa, Google Home |
Power & Installation(2) | ||
C‑Wire Requirement | true | false |
Power Source | 20-30 VAC | 120-240 V AC |
Display(1) | ||
Display Type | LED touchscreen | LED with capacitive touch touchscreen |
Build & Design(2) | ||
Device Weight (kg) | 0.386 kg | 0.51 kg |
Device Dimensions (H×W×D) (mm) | 25.4×149.35×95.25 mm mm | 129.5×88.9×20.3 mm mm |
Products in the top-left offer the best value (high score, low price).
Professional reviewers commend the Sensi ST55 for its straightforward DIY installation, ENERGY STAR efficiency and the claimed 23% energy savings, as well as its compliance with Title 24 and robust smart-home integration. However, they point out the need for a c-wire to unlock full functionality and the limitation to a 2.4 GHz Wi-Fi band.
Homeowners and renters alike praise the thermostat's quick setup, remote app control, energy-saving reports, and reliable fan circulation. Recurring complaints focus on occasional Wi-Fi drops, the necessity of a c-wire for some systems, and the lack of a built-in room sensor or precise humidity control.
Professional reviewers consistently commend the Mysa V2 for its ease of installation, substantial energy-saving claims, and extensive smart-home integration, positioning it as the top choice for electric baseboard heating upgrades. The main criticisms focus on wiring requirements and the lack of support for low-voltage heating systems.
Direct consumer reviews are not present in the sourced data, but the product’s multi‑pack offerings and emphasis on family‑friendly app access suggest a positive reception among homeowners seeking whole‑home zoning and remote control.
