---
product_id: 43173735
title: "Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55"
brand: "sensi"
price: "€ 178.10"
currency: EUR
in_stock: true
url: https://www.desertcart.hr/products/43173735-sensi-smart-thermostat-wi-fi-diy-alexa-energy-star-certified
store_origin: HR
region: Croatia
---

# Energy Star certified saves ~23% on HVAC energy Wi-Fi enabled for seamless remote control DIY install with built-in level & app guidance Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55

**Brand:** sensi
**Price:** € 178.10
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay cool, save green, and own your comfort with Sensi Smart Thermostat!

## Quick Answers

- **What is this?** Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55 by sensi
- **How much does it cost?** € 178.10 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/43173735-sensi-smart-thermostat-wi-fi-diy-alexa-energy-star-certified)

## Best For

- sensi enthusiasts

## Why This Product

- Trusted sensi brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Privacy First:** Your data stays yours—Sensi never sells your personal info to third parties.
- • **Proactive HVAC Care:** Get maintenance alerts and filter reminders to keep your system running efficiently year-round.
- • **Effortless DIY Setup:** Step-by-step app instructions and built-in level make installation a breeze—no pro needed.
- • **Smart Energy Savings:** Cut your HVAC energy bills by about 23% with flexible scheduling and real-time usage reports.
- • **Seamless Smart Home Integration:** Works flawlessly with Alexa, Apple HomeKit, Google Assistant, and more for voice & app control.

## Overview

The Sensi Smart Thermostat ST55 combines easy DIY installation, robust Wi-Fi connectivity, and Energy Star certification to deliver up to 23% HVAC energy savings. Designed with privacy in mind, it integrates smoothly with major smart home platforms and offers proactive maintenance alerts, empowering millennials to optimize home comfort effortlessly while reducing energy costs.

## Description

Sensi smart thermostats are designed for energy savings and data privacy – to give you full control of your home HVAC. With over 100 years of HVAC experience and manufactured by Emerson, you know our expertise already, even if you didn’t realize it. Emerson produces many of the HVAC parts that our smart thermostats control, so you can feel confident in the product you put on your wall. With our top-rated mobile app and easy installation process, customers of all comfort levels can make the switch to a Sensi smart thermostat. In addition, our customer service team of HVAC experts is always available to help you through any questions you might have. *For more information on Compatibility, Energy Savings, and Privacy Protection, please refer to the “Product Documentation” section below.

## Features

- PRIVACY PROTECTION*: Sensi won’t sell your personal information to third parties
- EASY DIY INSTALLATION: Use the built-in level and step-by-step app instructions for a quick installation. Works with HVAC equipment found in most homes. Common wire (c-wire) is not required in most applications
- SAVE ABOUT 23% ON HVAC ENERGY*: The ENERGY STAR-certified Sensi smart thermostat can help you save energy with features like flexible scheduling, remote access and usage reports
- SIMPLE CONFIGURATION: Looks and feels like a thermostat. Has buttons and fits the same space as a traditional thermostat so you don’t have to patch and paint your walls
- SMART MAINTENANCE: Sensi can help monitor the performance and efficiency of your HVAC system by delivering valuable usage reports, alerts about your equipment, and maintenance reminders like filter replacement

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Additional Features | Data Privacy, Easy DIY Install, Energy Savings, Filter Indicator, Programmable |
| Asin | B01NB1OB0I |
| Backlight | Yes |
| Best Sellers Rank | #765 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #3 in Home Programmable Thermostats |
| Brand Name | Sensi |
| Color | White |
| Connectivity Protocol | Wi-Fi |
| Connectivity Technology | Wi-Fi |
| Control Method | App, Touch, Voice |
| Control Type | Button Control |
| Controller Type | Amazon Alexa, Apple HomeKit, Google Assistant, SmartThings, Vera |
| Customer Reviews | 4.4 4.4 out of 5 stars (22,839) 4.4 out of 5 stars |
| Display Type | LED |
| Finish Types | Glossy |
| Global Trade Identification Number | 00786710554827 |
| Included Components | Thermostat, free mobile app, 2 AA batteries, mounting hardware, wire stickers, installation guide, welcome guide with Sensi code, warranty booklet |
| Item Dimensions D X W X H | 1"D x 5.88"W x 3.75"H |
| Item Type Name | , Works with Alexa, Energy Star Certified |
| Item Weight | 0.85 Pounds |
| Manufacturer | Copeland |
| Manufacturer Part Number | ST55 |
| Manufacturer Warranty Description | 3 years. |
| Material Type | Plastic |
| Model Name | ST55 |
| Model Number | ST55 |
| Mounting Type | Wall Mount |
| Number Of Batteries | 2 AA batteries required. (included) |
| Power Source | Corded Electric |
| Product Style | DIY |
| Screen Size | 5 Inches |
| Shape | Rectangular |
| Smart Home Compatibility | Smart Home Compatible |
| Specific Uses For Product | Air Conditioner, Boiler, Furnace, Heat Pump |
| Temperature Control Type | Programmable, Smart/Remote |
| Unit Count | 1.0 Count |
| Upc | 786710554827 |
| Voltage | 24 Volts (AC) |

## Product Details

- **Brand:** Sensi
- **Controller Type:** Amazon Alexa, Google Assistant, SmartThings, Vera
- **Model Name:** Wi-Fi Thermostat for Smart Home, DIY Version
- **Product Dimensions:** 1"D x 5.88"W x 3.75"H
- **Special Feature:** Data Privacy, Easy DIY Install, Energy Savings, Filter Indicator, Programmable

## Images

![Sensi Smart Thermostat, Wi-Fi, DIY, Alexa, Energy Star Certified, ST55 - Image 1](https://m.media-amazon.com/images/I/61L1yh4m7VL.jpg)

## Available Options

This product comes in different **Pattern Name, Style** options.

## Questions & Answers

**Q: Can you create a fan schedule?  I’d like the fan to always run from 10pm until 6am.**
A: Updated Answer:
THANK YOU to Albert who pointed out below that the fan can be controlled through SmartThings! It was annoying to have to set up another app and service to do this, but it is a workaround to get around Sensi's frustrating limitation. SmartThings allows you to set the fan to Auto, On, or Circulate (but not the percentage of time to circulate) and automate that on any schedule you want. Unfortunately, Alexa and Google still don't allow you to control the fan at all, even though Sensi's API apparently allows it.

Original Answer from June 6, 2020:
No, you can't do a schedule like if you want it to run all the time during the night. Also, you can't control the fan from Alexa to schedule it that way. Very annoying and unreasonable that they wouldn't add that option since you can turn it on manually from the app. They do have the auto-circulate feature, but that's not the same.

**Q: Is it smart enough to decide whether to run the heater or cooler to keep the temperature fixed?**
A: In spite of the snarky answer above that says that's what a thermostat does, it should be noted that a thermostat doesn't just so that unless it is a feature of the thermostat.

A thermostat is for comparing existing ambient temperature to programmed temperature. On a furnace, if the temperature exceeds the programmed temp, the furnace simply will not run. THAT is what a thermostat does. UNLESS there is the ability to set said thermostat to automatically adjust the temp to the programmed temp.

**Q: Can you program just the fan mode?**
A: As pointed out on a similar question, the Sensi app does not allow scheduling of the fan mode, but you can do it with a 3rd party integration to the SmartThings app. Unfortunately, Alexa and Google don't have the option to control the fan either, but the SmartThings workaround was good enough for me to set our fan to run automatically at night and turn off in the morning.

**Q: What if i have a C wire?**
A: The "C-wire" is the second wire for 24VAC which is used to power advanced thermostats. Older thermostats were just a mercury switch and didn't have a need for additional power supply. Most newer systems are using 5-conductor thermostat wire.. Think of it as the plus side of a DC circuit/battery (but it is AC[thermostats have a rectifier to convert the AC to DC for their use]). Use it and the "common-wire" to supply 24VAC to the thermostat and zone valves/zone dampers. Without it, the thermostat runs on battery all the time and will quickly run down with WiFi.  Add a zone controller like a Honeywell HZ311 which has full modern voltages output; i.e., c-wire with 24VAC. This control requires a 24VAC transformer and daisy chains the 24VAC to thermostats and works on older systems since it provides its own c-wire output to advanced thermostats.

## Frequently Bought Together

- Sensi Smart Thermostat, 100 Years Of Expertise, Wi-Fi, Data Privacy, Programmable, Easy DIY Install, Works With Alexa, Energy Star Certified, Mobile App, ST55
- Emerson F61-2663 Wall Plate for Sensi Wi-Fi Programmable Thermostat, White
- CAMGJORT F61-2663 Wall Plate for Sen si Wi-Fi Programmable Thermostat,Hand Control, White (1)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hr/products/43173735-sensi-smart-thermostat-wi-fi-diy-alexa-energy-star-certified](https://www.desertcart.hr/products/43173735-sensi-smart-thermostat-wi-fi-diy-alexa-energy-star-certified)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-14*