Lennox International Inc. provides heating and cooling products that include furnaces, air conditioners, heat pumps, packaged units, air handlers, boilers, garage heaters, and mini-split systems. The company uses precise comfort technology that allows the furnace to keep the temperature held exactly for various applications. The company provides variable-speed technology that allows the air handlers to provide a constant flow of air using the least energy consumption.

The company provides Comfort and ComfortSense thermostats that are designed to maximize the efficiency of heating and cooling systems. It also provides a Smart Zoning System that uses motorized dampers in ducts to reduce or increase airflow to different parts of the home, which moves air through the home. The zoning system works with the HVAC system to maintain the desired temperature in each zone, providing year-round comfort and energy savings.

The air purification and filtration systems are designed to work with central heating and cooling systems. It helps improve the air in the entire home. A Healthy Climate humidifier works with a heating system to keep the air inside the home from becoming too dry and causing wintertime chapped skin and respiratory problems. The ventilation systems offer a simple and effective solution that replaces stale indoor air with fresher outdoor air. The company also provides a wide variety of filtration products, which include high-performance air cleaners that remove small allergy-aggravating particles.