Terms and technical definitions for heating, cooling and indoor air quality products.

Annualized Fuel Utilization Efficiency is a measure of your furnace's heating efficiency. The higher the AFUE percentage, the more efficient the furnace. The minimum percentage established by the DOE for furnaces is 78%. Airflow

ARI is an industry trade association that develops standards for measuring and certifying product performance. For instance, ARI Standard 270 provides guidelines for establishing sound levels for outdoor air-conditioning equipment. Air Handler/Coil Blower

Microscopic living organisms suspended in the air that grow and multiply in warm, humid places.

An odorless, colorless, tasteless, poisonous and flammable gas that is produced when carbon burns with insufficient air.

System in which air is treated at a central location and distributed to and from rooms by one or more fans and a series of ducts.

Stands for Cubic Feet per Minute. This measurement indicates how many cubic feet of air pass by a stationary point in one minute. The higher the number, the more air is being moved through the ductwork by the system.

Used in select Lennox outdoor air conditioner or heat pump units, blades are manufactured with rugged materials and an exclusive angled design that improve operation and durability, even in the harshest environments.

The part of the outdoor air conditioner or heat pump that compresses and pumps refrigerant to meet household cooling requirements.

A component of a SunSource® Home Energy System, a communication module allows you to view system status and environmental benefits in real time.