---
product_id: 527224907
title: "Emerson Thermostats Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Mobile App,Easy DIY, Compatible with Alexa, Energy Star Certified, ST25, C-Wire Not Required on Most Systems, Black"
brand: "emerson"
price: "€ 108.60"
currency: EUR
in_stock: true
url: https://www.desertcart.ie/products/527224907-emerson-thermostats-sensi-lite-smart-thermostat-data-privacy-programmable-wi
store_origin: IE
region: Ireland
---

# Energy Star Certified - Save 23% on HVAC energy Mobile App Control - Manage comfort remotely DIY Installation - No C-wire needed on most systems Emerson Thermostats Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Mobile App,Easy DIY, Compatible with Alexa, Energy Star Certified, ST25, C-Wire Not Required on Most Systems, Black

**Brand:** emerson
**Price:** € 108.60
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay smart, save energy, and keep your comfort in your control!

## Quick Answers

- **What is this?** Emerson Thermostats Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Mobile App,Easy DIY, Compatible with Alexa, Energy Star Certified, ST25, C-Wire Not Required on Most Systems, Black by emerson
- **How much does it cost?** € 108.60 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/527224907-emerson-thermostats-sensi-lite-smart-thermostat-data-privacy-programmable-wi)

## Best For

- emerson enthusiasts

## Why This Product

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

## Key Features

- • **Proactive HVAC Care:** Receive usage reports and maintenance alerts to keep your system running efficiently.
- • **Effortless DIY Setup:** Built-in level and step-by-step guide make installation a breeze—no electrician needed.
- • **Privacy-First Design:** Your data stays yours—no selling or ad targeting, guaranteed.
- • **Smart Energy Savings:** Cut your HVAC energy bills by up to 23% with flexible scheduling and geofencing.
- • **Control From Anywhere:** Top-rated app lets you adjust your home’s temperature on the go, anytime, anywhere.

## Overview

The Emerson Sensi Lite Smart Thermostat (ST25) offers easy DIY installation without a common wire on most systems, Energy Star-certified savings of up to 23%, and secure, privacy-focused smart control via a top-rated mobile app compatible with Alexa. It delivers real-time HVAC performance monitoring and maintenance alerts, empowering you to optimize comfort and efficiency effortlessly.

## Description

Thermostats Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Mobile App,Easy DIY, Compatible with Alexa, Energy Star Certified, ST25, C-Wire Not Required on Most Systems, Black

## Features

- EASY DIY INSTALLATION: Do it yourself fast with a built-in level and simple step-by-step instructions. Works with the HVAC equipment found in most homes. No common wire (c-wire) required on most systems (only required on heat only and cool only systems)
- SAVE ABOUT 23% ON HVAC ENERGY*: ENERGY STAR-certified and packed with features that help you save money, including flexible scheduling, geofencing, remote access and usage reports
- PRIVACY PROTECTION*: Sensi won’t sell your personal information to third parties or leverage your thermostat activity data for targeting or advertising purposes
- CONTROL FROM ANYWHERE: The top-rated mobile app for Android and iOS devices makes it easy to control your comfort from a smartphone or tablet
- SMART MAINTENANCE: Sensi can help monitor the performance and efficiency of your HVAC system by delivering usage reports, alerts about your equipment, and maintece reminders like filter replacement

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Emerson |
| Model Number | ST25 |
| Color | Black |
| Product Dimensions | 2.24 x 12.88 x 7.95 cm; 136.08 g |
| Voltage | 24 Volts |
| Special Features | Auto Changeover, Daylight Savings Time Ready, Filter Indicator, Low Voltage, Programmable |
| Item Weight | 136 g |

## Product Details

- **Brand:** Emerson
- **Model name:** Sensi Lite
- **Product dimensions:** 2.2D x 12.9W x 8H centimeters
- **Controller type:** App Control
- **Special features:** Auto Changeover, Daylight Savings Time Ready, Filter Indicator, Low Voltage, Programmable

## Images

![Emerson Thermostats Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Mobile App,Easy DIY, Compatible with Alexa, Energy Star Certified, ST25, C-Wire Not Required on Most Systems, Black - Image 1](https://m.media-amazon.com/images/I/41hms-xFcSL.jpg)

## Questions & Answers

**Q: How does the auto changeover work? can i set it to keep the temp between 65 and 74 degrees and it turns a/c and heat on as necessary?**
A: Yes I wasn't sure how it would work.  I have my account set to 78.  AC came on when it go too hot.  Hope this helps.

**Q: Hi. My old thermostat has the red wire connect to RH which then jumps to RC. With the Sensi lite, do I just attached the red wire to R? Thank you.**
A: Sensi claims there is an internal jumper which means you only have to connect the red wire which now goes to RH. However, I had to pigtail the red wire and connect to both RH and RC

**Q: Will this thermostat work on a split unit meaning natural gas heat**
A: It works on my natural gas central unit (if you need emergency heat then no this touch lite will not work for you)

**Q: Does this have a child lock?**
A: Yes, it’s called Lock Thermostat Display. It’s located in the system settings.

## Frequently Bought Together

- Sensi Lite Smart Thermostat, Data Privacy, Programmable, Wi-Fi, Easy DIY, Works With Alexa, Energy Star Certified, ST25, Most Systems C-Wire Not Required, Except On Heat/Cool Only and Heat Pump System
- CAMGJORT SA5B Wall Plate for Sen si Touch Wi-Fi Thermostat ST75,Black(1 PACK)

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-22*