Comfort Sync® Thermostat

3.5
92 reviews
5K+
Downloads
Content rating
Everyone
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About this app

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 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” 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
Updated on
Nov 6, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info and App info and performance
Data is encrypted in transit

Ratings and reviews

3.5
85 reviews
Jeffrey Shields
October 17, 2022
Actually no stars as I haven't got to actually use the app yet. Won't even allow me to create an account. I fill in the fields to create an account and no matter how much I tweak them I get the message: "Unable to create user. Please retry with different details". This message is of absolutely NO value whatsoever as it gives me no clue as to what data I entered that it is taking exception with. Seriously? This is the best you can do? Using Samsung S10 with up to date Android OS.
7 people found this review helpful
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yawnoc111
August 24, 2021
I'm not sure about location etc, as I cannot even log in. I have registered online, and all works well online, but when i go to login on my phone, it tells me username/password incorrect. And yes I know how to do this. I have uninstalled and re-registered 3 times and still cannot get it to take. I called Comfort Sync but they told me they have nothing to do with the app. Disappointed
8 people found this review helpful
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Mark H
June 27, 2021
What happened to the location permission? It was removed in the most recent app update. To my knowledge, Home/Away sync will not work without location permission. The app even states this but there is no option to enable the location permission for this app. Home/Away sync is the most useful attribute for this app. Please fix this! I've tried to contact the developer multiple times with no response.
5 people found this review helpful
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What's new

• Bug fixes