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Emerson Sensi ST55 — Review & Specs | Pricepect | Pricepect

Home Smart ThermostatsEmerson Sensi ST55

Emerson Sensi ST55 — image 1

Emerson

Emerson Sensi ST55

Expert Review Analysis

The Emerson Sensi ST55 Smart Thermostat is a Wi‑Fi‑enabled, 5‑inch LED touchscreen thermostat that offers DIY installation in about 30 minutes, broad smart‑home compatibility, and up to 23% energy savings through scheduling and geofencing.

✓ Best for: DIY homeowners with single‑ or multi‑stage HVAC systems who want an affordable, easy‑install Wi‑Fi thermostat, especially those using Alexa or Google Assistant and seeking measurable energy savings through scheduling and geofencing.✗ Not ideal for: Homes without an existing c‑wire, users who require 5 GHz Wi‑Fi, those needing built‑in occupancy or remote room sensors, and consumers looking for a premium touchscreen interface or advanced learning algorithms.

Pros

✓DIY installation can be completed in 30 minutes or less with level and illuminated terminals
✓Provides up to 23% average HVAC energy savings through geofencing and scheduling
✓Broad smart home compatibility with Alexa, Google Assistant, Apple HomeKit, and Samsung SmartThings

Price History

Current

$98.95

Average

$88.34

Lowest

$42.95

Highest

$126.48

Price trend (90d):+1.4%

Best Seller Rank History

Now#6Best#3Worst#5,598 +3

Lower = better sales rank

Specifications

Accessories

Included AccessoriesThermostat base, mounting hardware, quick‑start guide, wire labels, security code card

Battery

Battery Type2 AA batteries (included)

Connectivity

Wi‑Fi Standard2.4 GHz 802.11 a/b/g/n

Bluetooth VersionBLE

Smart Home CompatibilityAlexa, Google Assistant, Apple HomeKit, Samsung SmartThings

Controls

Keypad LockoutYes

Temperature LimitsYes

Design

ColorPearl

Height1.0 in mm

Width5.88 in mm

Depth3.75 in mm

Weight0.85 lb g

Display

Screen Size5 in mm

Display Temperature Range32°F–99°F

Features

Circulating FanYes

Humidity ControlYes

GeofencingYes

Privacy ProtectionPersonal data not sold to third parties

Energy Savings23% percent

General

BrandEmerson

ManufacturerEmerson Climate Technologies

ModelST55

Release Date2017-05-22

Warranty3 years

Performance

Rated Differential (Heat)Fast 0.5°F, Medium 0.75°F, Slow 1.9°F

Rated Differential (Cool)Fast 0.9°F, Medium 1.2°F, Slow 1.7°F

Power

Power Input20‑30 VAC, 50/60 Hz

Maximum Current1.5 A per terminal, 2.5 A total

Sensors

Temperature Setpoint Range45°F–99°F

Operating Ambient Temperature32°F–105°F

Compliance

Title 24Compliant

Warranty

Warranty Period3 years

Research Sources

sensi.copeland.com

emersoncanada.ca

amerenmissourimarketplace.com

conservationmart.com

greencoolingsolutions.com

shop.emporiaenergy.com

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User Reviews

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4.3

(22,475 reviews)

$98.95$134.6927% off

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ST55WhiteNo Size 3 years.

Smart Thermostats

✓Standard rectangular size fits existing thermostat openings without needing wall patches

Cons

✗Full feature set, including HomeKit and heat pump control, requires a dedicated c‑wire connection
✗Wi‑Fi connectivity limited to 2.4 GHz band, lacking support for faster 5 GHz networks
✗No built‑in room sensor, so occupancy or temperature sensing must rely on the thermostat only
✗Users report occasional Wi‑Fi drops that can interrupt remote control and scheduling

From Expert Reviews

Praised by Experts

✓Professional reviewers praise its simplicity, reliability, and contractor‑tested easy‑click wiring
✓ENERGY STAR certification and claimed 23% energy savings are highlighted as major efficiency benefits
✓Title 24 compliance and 7‑day programmable schedule are noted as strong regulatory and convenience features

Criticized by Experts

✗Experts note the necessity of a c‑wire for HomeKit integration and heat‑pump operation limits some installations
✗Limited to 2.4 GHz Wi‑Fi and lacking a built‑in remote sensor are cited as drawbacks compared to premium competitors

From User Reviews

Users Love

✓Everyday users appreciate the quick setup process and ability to control the thermostat from anywhere via the app
✓Energy usage reports and fan circulation feature are frequently mentioned as helpful for comfort and savings
✓Smart home integration with Alexa and Google Assistant works flawlessly for many customers
✓Keypad lockout feature is valued by renters and households seeking child safety

Users Complain About

✗Customers frequently mention Wi‑Fi connectivity issues, including drops that affect remote access
✗The requirement for a c‑wire is a common complaint for homes without existing wiring
✗Basic LED display is considered less modern compared to touchscreen models with richer interfaces
✗Humidity control is sometimes reported as not precise enough for user expectations

Expert Opinion

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, which places it behind higher‑end competitors.

What Users Say

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.

Common Complaints

Frequent Wi‑Fi connectivity drops, mandatory c‑wire for full feature set, absence of built‑in room sensor, and occasional imprecision in humidity control.

How It Compares

vs. Nest Learning Thermostat

Advantages

✓Learning AI automatically adjusts schedule for comfort and efficiency
✓Sleek circular glass design integrates with many smart home ecosystems

Disadvantages

✗Higher price point and no native HomeKit support
✗Often requires professional installation for complex HVAC systems

Choose Nest if you want automatic learning and premium design and don’t need HomeKit.

vs. Ecobee SmartThermostat

Advantages

✓Includes built‑in Alexa speaker and remote sensors for room‑by‑room control
✓Supports both 2.4 GHz and 5 GHz Wi‑Fi networks

Disadvantages

✗Higher cost and more complex installation with additional sensors
✗Requires subscription for some advanced features

Pick Ecobee when you need multi‑room sensing and voice assistant integration.

vs. Sensi Touch 2

Advantages

✓Adds touchscreen display, geofencing, and optional remote sensors for enhanced control
✓Supports up to 8 heating/cooling stages

Disadvantages

✗Higher price than ST55 and still requires c‑wire for full functionality
✗More advanced features may be unnecessary for simple DIY users

Select Sensi Touch 2 if you want a touchscreen and extra stages but can afford the extra cost.

Rating Trend

Rating4.3/ 5Reviews22,485+3,170 reviews -0.20

Rated Differential (Heat, Fast)

Heat Differential0.5 °F per hour at 6 °F/hr

Dimensions & Weight

Height1.0 inches

Width5.88 inches

Depth3.75 inches

Weight0.85 pounds

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