Comfort Sync® A3 Ultra-Smart Thermostat

Perfectly controlled temperatures throughout your home.

Precise Comfort Control

Away Sync™

Uses the GPS in your smartphone to detect when you’re leaving and automatically changes the temperature to a more energy-efficient setting. It also detects when you’re coming back home, returning the temperature to its normal set point.

Voice ActivatedCompatible with Amazon Alexa* and Google Assistant†, the thermostat enables you to fine-tune your comfort with a simple voice command.

The Comfort Sync® A3 Ultra-Smart Thermostat takes personalized comfort to the next level.

Pairing the Comfort Sync® A3 Ultra-Smart Thermostat with Pro Series™ equipment gives you exceptional energy efficiency and maximum control over your home’s indoor environment.

App ControlledEnables you to monitor and control temperatures and settings from anywhere in the world using an innovative app and your compatible smart device.**

Climate Sync™

Monitors humidity levels, and removes excess moisture for cleaner, more comfortable air.

Schedule Sync™

Means you only need to program your thermostat once. Whenever there’s a change in your routine, the thermostat adapts heating and cooling to match.

Allergy Sync™

Monitors the air quality and pollen levels in your local ZIP/postal code and automatically turns the fan on to help clean your home’s air when outdoor levels are high.

*Comfort Sync® A3 is compatible with Armstrong Air HVAC products and requires separate purchase of Amazon Echo or Echo Dot. As of the date of this publication, Amazon Echo devices are not available for purchase in all countries. This reference is intended for use with US-based thermostats only. Amazon, Alexa and all related logos are trademarks of Amazon.com, Inc. or its affiliates. **Remote capability requires Wi-Fi or cellular data service.† Google is a trademark of Google LLC.

Individual zones deliver personalized control from room to room.

Temperature Control

Each zone is under the control of its own individual thermostat, which uses a built-in digital sensor to report temperature changes to the Comfort Sync A3 Ultra-Smart Thermostat. The Comfort Sync thermostat then readjusts airflow to maintain the set temperature in each zone.

Precision Airflow

The Comfort Sync A3 Ultra-Smart Thermostat adjusts the temperature of a particular zone by opening or closing the dampers in the ductwork and adjusting the blower speed. By doing this, the Comfort Sync Zoning system can redirect air to specific areas, while reducing airflow to others.

Smart Energy Use

Zoning allows you to match your heating and cooling needs with your lifestyle and may reduce energy wasted by heating and cooling unused areas of your home.

Temperature control that’s perfectly in sync with your family.

Comfort Sync zoning helps keep every area of your home comfortable and energy efficient. So, the kids’ upstairs bedrooms are just the way they want them, the downstairs keeps the entire family happy, and the guest room won’t waste energy when it’s empty.

When you add zoning to a Pro Series system, you gain the ability to customize temperatures from room to room. Comfort Sync zoning divides your home into up to four areas, or zones, each with its own temperature control. The Comfort Sync A3 Ultra-Smart Thermostat acts as the master control for each program, with small in-zone sensors allowing for convenient temperature adjustments in the individual areas.

Pro Series™ equipment offers you so much more.

The Pro Series family of products is a full suite of communicating HVAC equipment that offers premium performance and precise comfort control. Together, they create an energy efficient system that’s easy to use and personalized to meet your comfort needs. So, when you choose Pro Series equipment, you’ll be making a smart choice. And you’ll be making THE PROFESSIONAL’S CHOICE.

Due to our policy of continuous improvement, specifications are subject to change without notice.Printed in U.S.A.©2020 Allied Air Enterprises LLC, a Lennox International Inc. CompanyForm No. CSA3-300 (1/20) PC93606

*Remote capability requires Wi-Fi or cellular data service.

Comfort control your way, every day.

Every Pro Series™ system is created around the Comfort Sync® A3 Ultra-Smart Thermostat, which allows you to adjust your home’s environment from your compatible smartphone or mobile device anytime, anywhere. * Pro Series zoning with multiple thermostats offers even more customization with the ability to control temperatures from room to room.