Glossary
AFUE
Annual Fuel Utilization Efficiency. The AFUE percentage tells you how much energy is being
converted to heat. The higher the number the greater the efficiency.
Air Handler
The portion of your heating and cooling system that forces air through your home's ductwork.
BTU
British Thermal Units. The amount of heat it takes to raise one pound of water one degree
Fahrenheit. The higher the BTU rating, the larger the heating capacity of the furnace or air conditioner.
Capacity
The ability of a heating or cooling system to heat or cool a given amount of space. Heating is
usually expressed in BTUs, cooling is expressed in tons.
Compressor
The motor/pump that drives the air conditioning unit. It is responsible for pumping refrigerant
throughout the system.
Condenser Coil
Part of the outdoor portion of a heating or cooling system, that releases or collects heat from
the outside air.
Damper
A valve or moveable plate used in duct work that opens and closes to control airflow. They are
used to direct air to specific areas of the home.
Downflow
A type of furnace that takes cool air from the top and blows warm air to the bottom.
Ductwork
Hollow metal pipes used to transfer air throughout your house.
EcoLogic
Maytag's designation of green heating and cooling equipment.
EER
is a measure of how efficiently a cooling system will operate when the outdoor temperature is
at a specific level. The higher the EER, the more efficient the system.
Electronic Air Cleaner
An electronic device that filters out particles and contaminants in indoor air.
Evaporator Coil
Part of the heating or cooling system located indoors, that cools and dehumidifies the air by
converting liquid refrigerant into gas.
Heat Exchanger
The major part of the furnace that transfers heat into your home.
Heat Exchanger
The major part of the furnace that transfers heat into your home.
Heat Pump
A unit that handles both heating and cooling. In some climates, a heat pump may handle your
heating and cooling needs more efficiently than a furnace and air conditioner.
Horizontal Flow
A type of furnace, installed on its side, which draws air from one side, heats the air and then
sends it our the other side.
HSPF
Heating Seasonal Performance Factor. Measures the heating efficiency of a heat pump. The
higher the number the more efficient the heat pump heats your home.
Humidifier
A piece of equipment that adds moisture to the air as it comes out of the furnace.
HVAC
Heating, Ventilation and Air Conditioning
Refrigerant
A chemical that cools air as it evaporates.
SEER
Seasonal Energy Efficiency Rating. SEER measures a unit's cooling efficiency. The higher the
number, the greater the efficiency.
Single Package
An outdoor unit that contains both a heating and a cooling system.
Split System
Refers to an air conditioner or heat pump that is combined with indoor components, such as an
evaporator coil inside and a condenser coil outside your home.
Thermostat
A device that monitors and controls your temperature inside your home.
Upflow
A type of furnace that draws cool air from the bottom and blows the warmed air out the top.
Ventilator
A ventilator captures heating or cooling energy from stale indoor air and transfers it to fresh
incoming air.
Zone
Zoning allows you to control the heating and cooling delivered to specific areas of your house
for a custom solution. Zoning can increase efficiency and comfort in the areas of the house you
use most often.