# Comfort Sync® Thermostat

> Remote HVAC control and smart home comfort management for Comfort Sync A3 thermostats. (iPhone/iPad app by Allied Air Enterprises inc..)

- Source: https://appshunter.io/ios/app/comfort-sync-thermostat/id1513559837 (this page in markdown: same URL + `.md`)
- Developer: [Allied Air Enterprises inc.](https://appshunter.io/developer/618048457)
- Category: Utilities
- Price: Free
- Rating: 4.70/5 from 1,880 App Store ratings · 51 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 116 MB
- Languages: American English
- Released: 2020-06-01
- Data updated: 2026-08-25
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/comfort-sync-thermostat/id1513559837/reviews.md

## What is Comfort Sync® Thermostat?

"This app is designed to be used with the Comfort Sync A3 thermostat.

The Comfort Sync® A3 thermostat doesn’t just control temperatures like a conventional thermostat, it automatically adapts to individual lifestyles and to the changing environment to help deliver precision comfort, energy savings and peace of mind. The Comfort Syc (Sync) App allows the user to control their HVAC system from anywhere in the world as though they were standing in front of their own thermostat.

App Features

• Adjust and view your house temperature from anywhere in the world
• Edit and view your thermostat schedule
• Away Sync™ uses the location on your mobile phone to detect when the house is empty and automatically change the temperature to a more energy-efficient setting. When a family member is on the way home it automatically returns the temperature to its regular setting
• Much like a weather report will use a temperature and wind speed to determine a Wind Chill index to indicate the perceived temperature, the Comfort Sync True Temp™ temperature takes into account indoor and outdoor temperature and humidity to make a home feel exactly like the homeowner desires. Therefore, when the thermostat is set to 72 degrees, a home will “Feel Like” (a home's ""True Temp"" will be"") 72 degrees year-round
• Allergy Sync™ on the Comfort Sync A3 gives immediate allergy relief by monitoring air quality and pollen levels outside. When high levels of pollutants and allergens are detected, the fan automatically turns on to keep the home’s air clean
• The thermostat’s advanced warning system predicts problems before they happen and alerts the homeowner and your dealer if enabled
• Get alerts, reminders and advanced warnings from your system wherever you are

You must own a Comfort Sync A3 thermostat to use this app. The Comfort Sync A3 thermostat must also be connected to your home’s Wi-Fi router before the app can control the settings.

We truly appreciate your questions and comments. Please keep sending your suggestions to consumeraffairssocial@lennoxind.com or @AskDaveLennox on Twitter

*Continued use of GPS in the background can dramatically affect battery life"

## Key features

- Remote temperature adjustment
- Thermostat schedule editing
- Location-based energy saving (Away Sync™)
- True Temp™ for perceived comfort
- Air quality and pollen monitoring (Allergy Sync™)
- Predictive system alerts

## What do users think of Comfort Sync® Thermostat?

Overall sentiment: negative

**Pros**

- 👍 Easy to use
- 🚀 Allows control of variable speed systems
- 🚀 Maintains set temperature well
- 🚀 Quickly heats when set temp is raised
- 🔒 10-year warranty

**Cons**

- 🐛 Cumbersome and not intuitive interface
- 🐛 Constantly turning on and off, causing noise
- 🐛 App doesn't update properly
- 🐛 App randomly changes temperature settings
- 🐛 Significantly over-engineered, doesn't work well
- 🐛 App frequently disconnects from thermostat
- 🐛 Limited flexibility in setting schedules
- 🐛 Changes often don't stick
- 🐛 Slow and unresponsive app performance
- 🐛 Buggy UI with issues like jumping back to first thermostat

**Commonly reported bugs**

- App can't log in or sync with system
- Lack of reliable customer support

**Most requested features**

- Show percentage of current fan speed
- Ability to set hourly temperature schedules
- Integration with Apple HomeKit
- More control over fan operation

## Recent user reviews (10 of 51)

All indexed reviews: https://appshunter.io/ios/app/comfort-sync-thermostat/id1513559837/reviews.md

### 2/5 — Not intuitive

*2026-01-30*

Seems like it’s logical but does not do what I think it should. Limited to no literature or instructions online. Would love to love it but can’t make it work properly. Limited temperature ranges.

### 5/5 — Easy to use

*2026-01-10*

I thought it would be complicated to use but it’s actually well designed so not confusing. I like I can  lower the exterior temp I want the auxiliary heat to be used at because I don’t like for that to run at its own whim since it is not as efficient as the heat pump. I have a high efficiency system so it should be able to keep up at low temps but often the aux heat gets turned on if you make a large temperature swing more than 1.5 to 2 degrees so that it warms as quickly as possible…I don’t need that feature, I only want it if the system can’t keep up in the extreme cold and so I set it as such. Controls the variable speed communicating indoor and outdoor units nicely allowing them to operate at the highest  efficiency possible. Other non proprietary thermostats only allow variable speed systems to run at one of two speeds which takes away from the high efficiency characteristics of a variable speed system that monitors the room temperature conditions as well as outdoor conditions to choose the best speed possible for the ultimate in energy efficiency.  Only complaint is that it lacks showing what percentage of speed it is currently running at which would be nice to see but not required. So far it is doing a great job to maintain the set temperature and also quickly heat when the set temp is raised.  I like that it has a 10 year warranty since it is a touchscreen “mini iPad” type device so I’m protected should it stop working for 10 years.

### 2/5 — Fancy looking but cumbersome and not intuitive

*2026-01-10*

The app and wall mounted interface are fancy looking but when you go to actually use them they are cumbersome to use and not intuitive at all. I never use the set temps because the system is so sensitive that it is constantly going on and off. Because it is right outside my bedroom it wakes me up all night long. I find it better to just turn the system off completely and if I’m cold or hot I turn it on and off manually to limit the noise. I realize this is supposedly less efficient than allowing the system to maintain the temp but it is too loud. I have asked multiple times if I can swap out the interface for a Nest thermostat and I have been told no…I’m really tempted to try and swap it out myself just because this thermostat interface is so not user friendly.

### 1/5 — App doesn’t update

*2025-10-13*

Most frustrating app, won’t sync to system properly. So annoying!

### 1/5 — User

*2025-08-31, version 1.10.004*

The app randomly changes temperature settings. Very frustrating.

### 1/5 — Awful

*2025-07-28*

This thermostat is significantly over engineered and does not work well.  Trying to get the app to work properly is challenging and the support line is of little help.

### 5/5 — Works Great

*2024-12-20*

Very functional and easy to use.

### 3/5 — Needs more flexibility

*2024-11-30*

Needs more flexibility to be as good as my old EcoBee. Needs to let the user add more trigger times, as the app only allows 4. (EcoBee allows many more). Needs to be able to turn off the gradual heating between trigger times so the user can actually control the temperature precisely.

### 5/5 — Howie Siegel

*2024-10-18*

Best heating and cooling system in my life and lm old.

### 1/5 — App

*2024-10-15, version 1.07.509*

App doesn’t update iOS 18 waste of money

## Frequently asked questions about Comfort Sync® Thermostat

### What does the Comfort Sync app do?

This app allows you to remotely control your Comfort Sync A3 thermostat from anywhere in the world. It goes beyond basic temperature control by offering features like automatic energy savings based on your location, personalized comfort settings, and air quality monitoring.

### What are the key features of the Comfort Sync app?

Key features include adjusting and viewing your home's temperature remotely, editing your thermostat schedule, automatic energy savings with Away Sync™, personalized comfort with True Temp™, and allergy relief through Allergy Sync™ which monitors air quality and pollen levels.

### Is the Comfort Sync app free to use?

Yes, the app itself is free to download and use. However, you must own a compatible Comfort Sync A3 thermostat and have it connected to your home's Wi-Fi to utilize the app's functionality.

### What are the compatibility requirements for the Comfort Sync app?

You must own a Comfort Sync A3 thermostat to use this application. Additionally, the Comfort Sync A3 thermostat needs to be connected to your home's Wi-Fi router for the app to control its settings.

### How does the app help save energy?

The app features Away Sync™, which uses your phone's location to detect when your house is empty. It then automatically adjusts the temperature to an energy-efficient setting and returns it to your regular setting when you are on your way home.

## Version history (last 5 releases)

### 1.10.005 — 2026-04-16

This app will be sunset soon. Migrate to the MyHomeComfort app for a better experience. Just sign in with your Comfort Sync® credentials, your settings will transfer automatically so you can keep controlling your A3 thermostat remotely.

### 1.10.004 — 2024-10-28

* For this release Comfort Sync has included Low Global Warming Potential (GWP) refrigerant detection notifications
* Improved connections from thermostats to mobile APPs
* Support for Apple's latest OS version
* Bug Fixes

### 1.07.509 — 2023-11-08

Bug fixes.

### 1.07.500 — 2023-09-15

* Improved support for newer versions of iOS
* Bug Fixes

### 1.07.047 — 2023-05-23

Connectivity Improvements.

## Apps similar to Comfort Sync® Thermostat

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Bryant® Service Technician](https://appshunter.io/ios/app/bryant-service-technician/id1123183471) | 2.4 (38) | Free | Utilities |
| [Sizing US/CA](https://appshunter.io/ios/app/sizing-usca/id1420112805) | 3.2 (13) | Free | Utilities |
| [Ruud](https://appshunter.io/ios/app/ruud/id1608918835) | 4.6 (990) | Free | Utilities |
| [Lennox Home](https://appshunter.io/ios/app/lennox-home/id6443907619) | 4.6 (43,386) | Free | Utilities |
| [Carrier® Service Technician](https://appshunter.io/ios/app/carrier-service-technician/id1123086541) | 4.1 (108) | Free | Utilities |
| [LGMV-Business](https://appshunter.io/ios/app/lgmv-business/id1506724643) | 2.1 (25) | Free | Utilities |

## More apps by Allied Air Enterprises inc.

- [Comfort Sync](https://appshunter.io/ios/app/comfort-sync/id618048454)
- [Allied Crossover](https://appshunter.io/ios/app/allied-crossover/id945384905)
- [HVACPRO2GO](https://appshunter.io/ios/app/hvacpro2go/id1202294421)
- [Ducane Rewards](https://appshunter.io/ios/app/ducane-rewards/id1497782321)
- [Comfort Sync® Dealer Setup](https://appshunter.io/ios/app/comfort-sync-dealer-setup/id1513891802)

All apps by Allied Air Enterprises inc.: https://appshunter.io/developer/618048457

## Related topics

[comfort sync](https://appshunter.io/ios/topics/comfort-sync) · [comfort sync a3](https://appshunter.io/ios/topics/comfort-sync-a3) · [comfortpro](https://appshunter.io/ios/topics/comfortpro) · [caravan comfort](https://appshunter.io/ios/topics/caravan-comfort) · [vornado](https://appshunter.io/ios/topics/vornado) · [lennox smart thermostat](https://appshunter.io/ios/topics/lennox-smart-thermostat) · [pro thermostat](https://appshunter.io/ios/topics/pro-thermostat) · [aeris thermostat](https://appshunter.io/ios/topics/aeris-thermostat) · [icomfort thermostat](https://appshunter.io/ios/topics/icomfort-thermostat) · [comfort app](https://appshunter.io/ios/topics/comfort-app) · [adjustable comfort](https://appshunter.io/ios/topics/adjustable-comfort)

---

*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 2026-08-25.*