The Front Desk Review

Emerson Sensi · Updated July 2026

Sensi Smart Thermostat (ST55): price & specs

Sensi Smart Thermostat (ST55). Every price and spec below is linked to its source and dated — no guesses.

Source: sensi.copeland.com verified ✓ corroborated verify in ledger

On the Recordsourced & dated · eligible
See Sensi Smart Thermostat (ST55) on Amazon Live price at the store — may differ from the dated listed price above. As an Amazon Associate we earn from qualifying purchases.
Sensi Smart Thermostat (ST55) — Emerson Sensi
Image: thermostat.guide (© Emerson Sensi)

Is the Sensi Smart Thermostat (ST55) a good buy?

At $130, the Sensi Smart Thermostat (ST55) is #5 cheapest of the 13 smart thermostats we track, where the median is $159.

Specifications

Price (US)$129.99 US MSRP $129.99 per the sensi.copeland.com Sensi thermostat comparison table, listed in the "Sensi smart" column (Models ST55, ST55U, 1F87U-42WF). Column alignment cross-checked against the Sensi Touch 2 MSRP $209.99 on the same table, which matches the existing catalog entry, confirming $129.99 maps to the ST55.
BrandEmerson Sensi
Released—
DisplayLED display (indoor temperature and humidity shown on-screen)
Sensors includedBuilt-in temperature and humidity sensors; not compatible with Sensi Room Sensors (Touch 2 only)
GeofencingYes
Hvac compatibilitySingle-stage and multi-stage gas, oil, electric and heat pump systems; 20 to 30 VAC low-voltage; setpoint range 45°F to 99°F. Common wire required for heat-only, cool-only, heat pump, and zone systems
C wire requiredNo
Voice assistantsAmazon Alexa, Google Assistant, Apple HomeKit (c-wire required for HomeKit), Samsung SmartThings
Energy reportsYes

Source: sensi.copeland.com (verified 2026-07-10) · corroborated by thermostat.guide. sensi.copeland.com/en-us/products/wifi-thermostat (the "Sensi smart Wi-Fi thermostat" page) confirms this is the exact model: its on-page comparison table lists the "Sensi smart" column with Models ST55, ST55U, 1F87U-42WF, MSRP $129.99, Screen Type LED, C-Wire "Not required for most systems," Geofencing, Humidity control, monthly energy usage reports, and Smart Home Compatibility with Amazon Alexa, Google Home, and Samsung SmartThings. thermostat.guide's "Emerson ST55, Sensi Smart Thermostat Product Specifications" page corroborates the ST55 identity and adds STANDARD SYSTEMS (single- and multi-stage gas/oil/electric and heat pump), a 20 to 30 VAC electrical rating, a 45°F to 99°F setpoint range, Apple HomeKit support with c-wire required, and "no common wire (c-wire) is required for most installations." Price $129.99 is the manufacturer's stated MSRP on the comparison table (alignment verified via the Touch 2's $209.99 matching the existing catalog); neither page states a release year, so releaseDate and release are null.

Is the Sensi Smart Thermostat (ST55) worth it vs cheaper smart thermostats?

Sensi Smart Thermostat (ST55) against its closest cheaper and pricier smart thermostats on the specs that matter — every value sourced. See all 13 ranked

ProductPriceDisplaySensors includedGeofencingHvac compatibilityC wire required
Sensi Smart Thermostat (ST55) this$129.99LED display (indoor temperature and humidity shown on-screen)Built-in temperature and humidity sensors; not compatible with Sensi Room Sensors (Touch 2 only)YesSingle-stage and multi-stage gas, oil, electric and heat pump systems; 20 to 30 VAC low-voltage; setpoint range 45°F to 99°F. Common wire required for heat-only, cool-only, heat pump, and zone systemsNo
GE Cync Smart Thermostat$119.99Backlit LCD display (always on); button and app control (Control Type: Buttons and App)No remote sensor included (package contains 1 thermostat); Cync Room Temperature Sensors sold separately—Most residential 24V heating and cooling systems; designed for C-wire systems, Power Extender Kit (PEK) included for homes without a C-wire; 3- and 4-wire installation optionsNo
ecobee Smart Thermostat Essential$139.992.8-inch full-color LCD touchscreen, 240x320 pixelsBuilt-in temperature and humidity; no occupancy sensor; room sensors sold separately—Gas, oil, electric forced air; conventional 2H/1C and 1H/2C; heat pump 2H/1C; Power Extender Kit sold separatelyNo

Frequently asked questions

How much does the Sensi Smart Thermostat (ST55) cost?

The Sensi Smart Thermostat (ST55) has a US price of $129.99 (US MSRP $129.99 per the sensi.copeland.com Sensi thermostat comparison table, listed in the "Sensi smart" column (Models ST55, ST55U, 1F87U-42WF). Column alignment cross-checked against the Sensi Touch 2 MSRP $209.99 on the same table, which matches the existing catalog entry, confirming $129.99 maps to the ST55.), as of 2026-07-10.

How does the Sensi Smart Thermostat (ST55) compare on price?

At $130, the Sensi Smart Thermostat (ST55) is #5 cheapest of the 13 smart thermostats we track, where the median is $159.

What are the Sensi Smart Thermostat (ST55)'s key specs?

Sensi Smart Thermostat (ST55) (Emerson Sensi): display LED display (indoor temperature and humidity shown on-screen), sensors included Built-in temperature and humidity sensors; not compatible with Sensi Room Sensors (Touch 2 only), geofencing Yes, hvac compatibility Single-stage and multi-stage gas, oil, electric and heat pump systems; 20 to 30 VAC low-voltage; setpoint range 45°F to 99°F. Common wire required for heat-only, cool-only, heat pump, and zone systems, c wire required No. Full sourced spec sheet verified 2026-07-10.

Price of record: $129.99 at sensi.copeland.com, 2026-07-25. Other retailers may be lower — check the current price:

See Sensi Smart Thermostat (ST55) on Amazon As an Amazon Associate we earn from qualifying purchases.

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