The indoor part of an air conditioner or heat pump that moves cooled or heated air throughout the ductwork of your home. An air handler is usually a furnace or a blower coil.

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

A British thermal unit is a unit of heat energy. One Btu is the amount of heat required to raise one pound of water by one degree Fahrenheit. The higher the Btu rating, the greater the heating capacity of the system.

British thermal units per hour.

The Combined Annual Efficiency is a measure of the amount of heat produced for every dollar of fuel consumed for both home and water heating.

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 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.