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AFUE Annual Fuel Utilization Efficiency. A measure of a gas furnace's efficiency in converting fuel to energy ­ the higher the rating, the more efficient the unit. For example: A rating of 90 means that approximately 90 percent of the fuel is used to provide warmth to your home, while the remaining 10 percent escapes as exhaust.
BTU British Thermal Unit. This is the amount of heat it takes to raise one pound of water one degree Fahrenheit. For your home, it represents the measure of heat given off when fuel is burned for heating or the measure of heat extracted from your home for cooling.
Glossary
CFM Cubic Feet Per Minute. A standard measurement of airflow. A typical system requires 400 CFM per ton of air conditioning.
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Capacity The output or producing ability of a piece of cooling or heating equipment. Cooling and heating capacities are referred to on BTUs.
Compressor The heart of an air conditioning or heat pump system. It is part of the outdoor unit and pumps refrigerant in order to meet the cooling requirements of the system.
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Condensor Coil or Outdoor Coil In an air conditioner, the coil dissipates heat from the refrigerant, changing the refrigerant from vapor to liquid. In a heat pump system, it absorbs heat from the outdoors.
Ductwork Pipes or channels that carry air throughout your home. In a home comfort system, ductwork is critical to performance ­ in fact, it's as critical as the equipment.
Glossary of HVAC Terms
Damper Found in ductwork, this movable plate opens and closes to control airflow. Dampers can be used to balance airflow in a duct system. They are also used in zoning to regulate airflow to certain rooms.
Evaporator Coil or Indoor Coil The other half of your air conditioning system located inside your home in the indoor unit. This is where the refrigerant evaporates as it absorbs heat from the air that passes over the coil.
Gas Furnace Heat Exchanger Located in the furnace, the heat exchanger transfers heat to the surrounding air, which is then pumped throughout your home.
HSPF Heating Seasonal Performance Factor. This rating is used in measuring the heating efficiency of a heat pump. The higher the number, the more efficient the unit.
HSPF Heating Seasonal Performance Factor. This rating is used in measuring the heating efficiency of a heat pump. The higher the number, the more efficient the unit.
Refrigerant A chemical that produces a refrigerating effect while expanding and vaporizing. Most residential air conditioning systems contain R-22 refrigerant. R-22 is regulated by international controls under the Montreal Protocol and in the United States by the Environmental Protection Agency. It is scheduled to be in production until the year 2020. It's used in approximately 95 percent of air conditioning equipment manufactured in the U.S. today.
SEER Seasonal Energy Efficiency Ratio. A measure of cooling efficiency for air conditioners and heat pumps. The higher the seer, the more energy efficient the unit. The government's minimum SEER rating is 10. (It's similar to comparing miles per gallon in automobiles.)
Split System The combination of an outdoor unit (air conditioner or heat pump) with an indoor unit (furnace or air handler). Split systems must be matched for optimum efficiency.
Thermostat A thermostat consists of a series of sensors and relays that monitor and control the functions of a heating and cooling system.
Ton A unit of measurement used for determining cooling capacity. One ton is the equivalent of 12,000 BTUs per hour.
Zoning A method of dividing a home into different comfort zones so each zone can be independently controlled depending on use and need.
CIE Certified Indoor Environmentalist. One who can identify the causes of poor indoor air quality - even when problems seem vague or unrelated to visable problems.
Energy Auditor A home energy audit is the first step to assess how much energy your home consumes and to evaluate what measures you can take to make your home more energy efficient.
IAQ Indoor Air Quality
Duel Fuel The Duel Fuel System matches a high efficiency gas furnace to an ultra efficient heat pump. This kind of system uses the heat pump during most of the operating cycle and the gas is used as back-up and aux. heat.
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