# Sensi Smart Thermostat (ST55): specs and price

**Price (US):** $129.99 at sensi.copeland.com (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 2026-07-25. A sourced, dated price of record — other retailers (incl. Amazon) may be lower. Among the 13 smart thermostats we track it is #5 cheapest of 13; category median $159.
**Brand:** Emerson Sensi
**Price tracked since:** July 2026

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | $129.99 |
| Brand | 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 |
| Voice assistants | Amazon Alexa, Google Assistant, Apple HomeKit (c-wire required for HomeKit), Samsung SmartThings |
| Energy reports | Yes |

## Where it stands

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

## 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.

Source: https://sensi.copeland.com/en-us/products/wifi-thermostat (sensi.copeland.com, accessed 2026-07-10)
Corroboration: https://thermostat.guide/emerson/emerson-st55-sensi-smart-thermostat-product-specifications/ (accessed 2026-07-10)
Canonical: https://frontdeskreview.com/product/smart-thermostats/sensi-smart-thermostat-st55/
Cite: Per The Front Desk Review, the Sensi Smart Thermostat (ST55) price of record was $129.99 as of 2026-07-10 — https://frontdeskreview.com/product/smart-thermostats/sensi-smart-thermostat-st55/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl