# Ion SmartHome — user reviews > 82 indexed App Store user reviews of Ion SmartHome by International Comfort Products Corporation, rated 3.80/5 from 217 ratings. - Source: https://appshunter.io/ios/app/ion-smarthome/id6740242146/reviews - App overview in markdown: https://appshunter.io/ios/app/ion-smarthome/id6740242146.md - Rating breakdown: 5★ 140 · 4★ 5 · 3★ 9 · 2★ 10 · 1★ 53 ## What do users think of Ion SmartHome? Overall sentiment: negative **Pros** - 👍 Decent app performance **Cons** - 🐛 Reliability issues with connectivity and functionality - 🤔 Confusing and cluttered user interface - 🤷‍♀️ Lack of expected features (e.g., HomeKit support, wireless sensors) **Commonly reported bugs** - Unable to turn unit on/off - Humidity settings not updating properly **Most requested features** - Add HomeKit integration - Improve remote access and control capabilities - Provide better visibility into system status and performance ## Newest reviews (15 of 82) ### 2/5 — HomeKit was promised, but not delivered *2026-02-14* HomeKit was promised with a previous version to be on the roadmap and it’s never been delivered, what’s the status of HomeKit compatibility? I want to be able to ask Siri to set the temperature to what I want as well as the fan speed and humidifier. ### 1/5 — Difficult system *2025-11-22, version 1.2.22* The thermostat is the most complicated one I have ever used. I wish I had my old system back. ### 1/5 — Lost connection!! *2025-11-07, version 1.2.22* Lost connection to panel when I updated with new app ### 1/5 — Remember your Observer App? *2025-11-05* I have one of your first apps for controlling the thermostat for the Comfortmaker. It is wonderful that you have moved on to bigger and better things. However, those of us still stuck with the app you haven’t bothered to update or upgrade in over 5 years would appreciate it if you would make the effort to actually get it to work. **Developer response:** Sorry you’re running into this. Our current SmartHome app offers advanced features for newer devices. To get the best support for your specific system, please use the in-app support option by navigating to Profile → Help & Support → Contact Us. This ensures our team can provide assistance tailored to your setup. ### 1/5 — Device not found *2025-10-29, version 1.2.21* I’ve tried off and on for months and still can not get the thermostat to pair with my phone ### 1/5 — Invalid code upon account creation *2025-10-19, version 1.2.21* Can’t create a login because the code’s i’m receiving by email are “invalid”. Total jank. Will update if/when i can login to the account for my expensive thermostat/heat pump. ### 1/5 — User account not recognized *2025-10-16, version 1.2.21* Another user whose account was deleted when the developer updated the app. Neither username or email recognized. ### 1/5 — Off line *2025-10-07, version 1.2.21* Unable to connect. Shows it as offline. When can I expect the servers to be back on line? 10-6-2025 Continues to stay off line. No communication from the phone. ### 2/5 — Old app was better, and that’s not saying much *2025-09-15* I don’t know who they created this app for, but there’s no actual control of my system. One example, I like to be able to run my fan on low at times (especially while sleeping.) As best I can see, there’s no way to control the fan. It’s either Auto, Medium, or High. Auto means off. Low means off. At least with the old system I could set the fan to low on my sleep schedule. If that exists now, I can’t tell. I think they tried to over-simplify, yet at the same time, it’s not intuitive what you’re getting. My old non-smart thermostat gave me more options. Please improve this system. I am close to replacing a second HVAC system, and if this is the only “smart”thermostat for the brand group, I’ll likely switch brands. For the most part, I like the mechanical pieces of the system. But the Ion thermostat is not good. **Developer response:** Thank you for your detailed feedback and we're glad you're enjoying the performance of the system overall. You mentioned wanting to run the fan on low during sleep, that is available via the Schedule feature. If you’d like help setting it up, please contact us at ResDigital@carrier.com and our support team would be happy to walk you through it. ### 1/5 — No voice control *2025-09-09* I hate it because it does not have voice control functionality. As glitchy as google home was in my last home, I would 100% prefer it to this. I hate that we allowed our our tech guys to build our system around this. **Developer response:** Voice control is available for certain thermostats and wall controllers. Please email us at ResDigital@carrier.com with your system details, and we’ll review compatibility and help you set up the right options for your home. ### 1/5 — Off line *2025-08-08* Unable to connect. Shows it as offline. When can I expect the servers to be back on line? **Developer response:** We are so sorry for the frustration of the app being offline. Losing remote control is a critical issue. We have several updates in the works with significant connectivity improvements. For one-on-one help, please email our support team at ResDigital@carrier.com. ### 1/5 — Off line *2025-08-02* Unable to connect. Shows it as offline. ### 1/5 — Off line *2025-07-23* Unable to connect. Shows it as offline. ### 1/5 — Awful *2025-06-25, version 1.1.12* I have to “add device” at least once a week because it deletes my AC unit off the system. This convenient wireless feature is meaningless because I have to go to the system to scan the QR code to add it all the time. What’s the point in being wireless when I have to go to the thermostat anyway? Terrible. Go back to the old app!!!! ### 1/5 — Junk *2025-06-22* As a HVAC service manager. Attempting to install this in my own home to test out the system. Nothings syncing with the phone. And attempting to create an account to use the app is not working ether. I’d never offer this to a customer if I can’t even get my own to work. **Developer response:** As a service manager, your feedback is incredibly valuable, and we are very sorry for this poor first impression. The account creation and sync issues you encountered have been resolved in recent updates. You can now sign up with Google/Apple, and the app is much more stable. We hope you will try the latest version. ## Most critical reviews (10 lowest-rated) ### 1/5 — Inaccurate and doesn’t communicate properly, no HomeKit *2026-08-27* This app has been a joke for a long time and multiple versions and rewrites, the app doesn’t report the status accurately, it doesn’t communicate properly when I change the fan speed for instance, and they took away the better view of the weather showing with the temperature outside and the temperature inside from the previous app rewrite, and there’s still no HomeKit. This company promised to add HomeKit a year ago and they haven’t done a thing yet. ### 1/5 — Trying to create account *2026-06-22, version 1.2.35* Can’t even create an account. None of the verification codes sent will work. ### 1/5 — Frustrated *2026-05-23* Worked fine for almost 3 years. About a month or so ago it stopped connected to the company server. Connects to my WiFi just fine. Using 2.4ghz router. Won’t connect to company’s Data or OTA server. Completely useless. Local HVAC installer says they have no idea why. **Developer response:** We appreciate you leaving a review. For the fastest help, head to Profile → Help & Support → Contact Us in the SmartHome app. If it can’t be resolved there, our support team can take a closer look and guide next steps. ### 1/5 — Annoying *2026-03-07, version 1.2.28* It’s super annoying when I change the temp on my app and then it doesn’t stick and I have to go back in 2 or 3 times to make it stick ### 1/5 — Junk *2026-02-12, version 1.2.26* Worked fairly well until updating. now don’t buy. ### 1/5 — Dr *2026-02-12* This worked fairly well until I updated it. Then it would not connect to the internet anymore. Says not enough bandwidth, was fine before update now it is worthless **Developer response:** Thanks for your patience. We’ve made support in the SmartHome app simpler and faster. Go to Profile → Help & Support → Contact Us, most users are able to resolve things right there. ### 1/5 — User account not recognized *2025-12-21, version 1.2.24* HVAC good. App horrible. Neither username or email recognized. Happened after an October update then again in December. Developer just apologizes but doesn’t care. Which is why they do it repeatedly and get Apple to reset their rating stats. ### 1/5 — Needs more options *2025-12-09* You can not set or adjust a schedule from the app. Sometimes when you need it you find it unavailable. **Developer response:** Thanks for your patience. We’ve made support in the SmartHome app simpler and faster. Go to Profile → Help & Support → Contact Us, most users are able to resolve things right there. ### 1/5 — Does not work *2025-12-02* This thermostat as well as app doesn’t have a heat button. So when it is cold in the house there is no way you can heat up your house. Also, it goes off line very often, and I cannot regulate the temperature I want. I would not even put a star for this app as well as thermostat itself. **Developer response:** This isn’t the experience we want for you. For the quickest help, open the SmartHome app and go to Profile → Help & Support → Contact Us. It resolves most issues, and our team can dive deeper if needed. ### 1/5 — Won’t buy another *2025-11-30, version 1.2.23* The app is terrible, when they upgrade the app , you lose your settings/login information. Overpriced HVAC equipment ## Most praised reviews (10 highest-rated) ### 5/5 — Invalid code upon account creation *2026-01-22, version 1.2.25* Updated review after response from the company. Despite codes being invalid when attempting to verify my email address, it looks like my email is now verified. Frustrating experience at first for the price of the system, but everything seems to be fine now. App features are good and regularly updated. Satisfied customer after some initial hiccups. ### 5/5 — Variable Speed optimization *2025-10-21* I’m am so thrilled to have a system that is top notch and has a variable speed platform that allows for my home to practically be the same ambient temperature on all three levels. This unit rocks and I love the option of having the app that allows me to adjust the settings no matter where I am in the home or away from the home. I love it. **Developer response:** Thank you so much for this wonderful feedback! We're so happy to hear that you're enjoying the consistent comfort throughout your home and the convenience of the app. Our team works hard to deliver that exact experience and it means a lot to us that you took the time to share your satisfaction. Enjoy your system! ### 4/5 — Works but Info Might be Wrong *2026-08-25* This app works great for controlling what I need from my couch. There’s plenty of options. That being said, the inverter always says either working at 89 percent capacity or off. It’s always possible something is legitimately wrong with my system but I think it’s more than likely something wrong with how the app tracks the variable system. ### 4/5 — Improving *2025-05-15* The app is improving from its initial launch. Now if you would make the temp #s LARGER so in the middle of the night we can read it without glasses. Thanks! **Developer response:** Thank you for the kind feedback — we’re glad to hear the app is improving! We’ve shared your suggestion about larger temperature numbers with the team, as accessibility and ease of use are top of mind. If you have more ideas, we’d love to hear them at ResDigital@carrier.com. ### 4/5 — Verses Nest *2025-05-04* I used to have a Nest thermostat. I purchased the optional sensor (it looked like a quarter sized hockey puck). I was able to program it so that it transferred control at night to the little sensor in my bedroom. I wish this had that option **Developer response:** Your experience is important to us! Thank you for sharing your feedback and feature comparison — we understand how useful additional sensors and zone control can be for personalized comfort. We’ve shared your suggestion with our product team as we continue exploring ways to enhance the app’s functionality. If you have more ideas or questions, feel free to reach out to us at ResDigital@carrier.com. ### 4/5 — Improved App *2025-04-27* I wrote a scathing review a couple weeks ago because I was locked out of the old ION app and the new app would not install. I am pleased that the issue has been resolved. Thank you, developer. The new app is actually quite good, however, I would like to see an option for my one zone to be on the opening page. **Developer response:** Thank you for your feedback. Your experience is important to us. We’re sorry to hear you’re having trouble on the intro screen. Adjusting your device’s font size may help, and please update your app to the latest version (1.1.9), as recent updates have included improvements in this area. If the issue continues, feel free to contact us at ResDigital@carrier.com so we can assist you directly. ### 4/5 — Still has a Bug and locks up *2025-04-12, version 1.1.8* This app is decent and does the job, but it would be nice to be able to set the order of the zones or at least alphabetize them of which is at the top or bottom. We have three zones and they are out of order and we cannot get them in the right order. Also I just downloaded the app in my wife’s iPhone 13, and as you are going through the new feature’s the App completely locks up and becomes useless. YOU MUST FIX THIS IMMEDIATELY!!! You also disabled the Old App where you can no longer use it, so please get with your IT guys or developers this weekend and fix this. Thank you. ### 4/5 — Decent *2025-03-24, version 1.1.7* Works about as well as the previous app, but had to restart the thermostat to get humidity settings to update. ### 3/5 — Barebones *2026-04-13* Maybe it’s only the thermostat model I have, but I was expecting this to be much more than just a “set temperature” app. Where are the usage graphs? Fan speed/stage information over time? Temperature graphs over time, etc etc. These seem like basic features for a smart thermostat + app. Am I missing something? **Developer response:** Sorry you're running into this. The SmartHome app offers core thermostat control. For advanced features like usage graphs and historical temperature data, capabilities vary by specific system models. We invite you to join our early access program to experience upcoming features. To get the fastest feedback on your unique system, please use in-app support by navigating to Profile -> Help & Support -> Contact Us. ### 3/5 — Complaints *2025-10-17* Can’t find a Help button. Can’t find a way to cancel my Schedule. Wall display is simpler and better than on the phone. + and - signs are too small to see on phone when I wake up with blurry eyes. **Developer response:** Thank you for this helpful feedback. We're sharing this with our design team to guide improvements, especially regarding button size and readability. For immediate assistance: Schedules: Tap on your device and then tap on the Schedule button from the bottom panel, select a scheduled block to edit or delete it. If you would like to override a current schedule, you can tap the icon below the temperature dial for a hold selection. Help: Tap on the "Help & Support" icon (message with question mark) in the top right corner in your home screen. We appreciate you helping us improve. If you need further assistance, please contact us at ResDigital@carrier.com. --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-14.*