--- product_id: 346188767 title: "Sensi Wi-Fi Thermostat" brand: "emerson" price: "¥70972" currency: JPY in_stock: true category: "Emerson" url: https://www.desertcart.jp/products/346188767-sensi-wi-fi-thermostat store_origin: JP region: Japan --- # Save up to 23% on HVAC energy bills Wi-Fi connectivity for seamless control DIY install with no c-wire needed Sensi Wi-Fi Thermostat **Brand:** emerson **Price:** ¥70972 **Availability:** ✅ In Stock ## Summary > 🌡️ Stay smart, save energy, and own your comfort. ## Quick Answers - **What is this?** Sensi Wi-Fi Thermostat by emerson - **How much does it cost?** ¥70972 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/346188767-sensi-wi-fi-thermostat) ## 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 - • **Privacy First:** Your data stays yours—no selling to third parties, guaranteed. - • **Hassle-Free Setup:** Built-in level and step-by-step app guidance make installation a breeze, no pro needed. - • **Proactive HVAC Health:** Receive timely alerts and maintenance reminders to keep your system running smoothly. - • **Effortless Smart Control:** Manage your home climate remotely via Alexa, Google, or Apple HomeKit apps. - • **Energy Savings That Matter:** Cut HVAC costs by nearly a quarter with flexible scheduling and usage reports. ## Overview The Emerson Sensi Wi-Fi Thermostat is an ENERGY STAR-certified smart thermostat designed for easy DIY installation without requiring a common wire in most homes. Compatible with major smart home platforms like Alexa, Google Assistant, and Apple HomeKit, it offers remote control, flexible scheduling, and detailed usage reports to help users save up to 23% on HVAC energy. With built-in privacy protection and proactive maintenance alerts, it combines classic design with modern smart features to optimize home comfort and efficiency. ## Description Sensi Wi-Fi Thermostat ## 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 - 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 - 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 ## Technical Specifications | Specification | Value | |---------------|-------| | Brand | Emerson | | Product Dimensions | 2.5D x 14.9W x 9.5H Centimeters | | Controller Type | Amazon Alexa, Apple HomeKit, Google Assistant, SmartThings | | Colour | White | | Specific Uses For Product | Air Conditioner, Boiler, Furnace, Heat Pump | | Connectivity Technology | Wi-Fi | | Power Source | Corded Electric | | Item Weight | 386 g | | Voltage | 24 Volts (AC) | | Material | Wi | | Shape | Rectangular | | Screen Size | 5 Inches | | Control Type | Button Control | | Control Method | App, Remote | | Connectivity Protocol | Wi-Fi | | Mounting Type | Wall Mount | | Style | Classic | | Backlight | Yes | | Number of Batteries | 1 AAA batteries required. (included) | | UPC | 786710554827 | | Global Trade Identification Number | 00786710554827 | | Manufacturer | Emerson | | Model | ST55 | | Batteries | 1 AAA batteries required. (included) | | Item model number | ST55 | | Batteries Included | Yes | | Batteries Required | Yes | | Does it contain liquid? | No | | Country of Origin | USA | ## Product Details - **Brand:** Emerson - **Product Dimensions:** 2.5D x 14.9W x 9.5H Centimeters - **Controller Type:** Amazon Alexa, Apple HomeKit, Google Assistant, SmartThings - **Colour:** White - **Specific Uses For Product:** Air Conditioner, Boiler, Furnace, Heat Pump - **Connectivity Technology:** Wi-Fi - **Power Source:** Corded Electric - **Item Weight:** 386 g - **Voltage:** 24 Volts (AC) - **Material:** Wi ## Images ![Sensi Wi-Fi Thermostat - Image 1](https://m.media-amazon.com/images/I/61Rl-IZR--L.jpg) ![Sensi Wi-Fi Thermostat - Image 2](https://m.media-amazon.com/images/I/61eYIzj13TL.jpg) ![Sensi Wi-Fi Thermostat - Image 3](https://m.media-amazon.com/images/I/61VwfOjqYjL.jpg) ![Sensi Wi-Fi Thermostat - Image 4](https://m.media-amazon.com/images/I/512MPfJJUJL.jpg) ![Sensi Wi-Fi Thermostat - Image 5](https://m.media-amazon.com/images/I/71oW2hSiPiL.jpg) ## 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.jp/products/346188767-sensi-wi-fi-thermostat](https://www.desertcart.jp/products/346188767-sensi-wi-fi-thermostat) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-05-18*