AFUE – Annual Fuel Utilization Efficiency. AFUE is the percentage of fuel that is being utilized to warm your home, as opposed to the remaining percentage that escapes as exhaust. A higher rating generally indicates a highly efficient gas furnace.
BTU – British Thermal Unit. This unit of measurement, which calculates the amount of heat needed to raise water one degree, is used to measure the amount of heat given to your home when heating it or extracted from your home while cooling it.
CFM – Cubic Feet Per Minute. CFM measures airflow. 400 CFM per ton is the standard air conditioning system requirement.
HSPF – Heating Seasonal Performance Factor. HSPF is a rating, used to measure the efficiency of a heating pump. A unit with a higher HSPF number is more efficient than one with a lower HSPF.
SEER – Seasonal Energy Efficiency Ratio. The same as HSPF, except for cooling. The higher the SEER, the more energy efficient an air conditioning unit’s efficiency is.
Capacity – Uses BTUs to measure a piece of cooling or heating equipment’s output and production.
Compressor – The “heart” of any outdoor HVAC unit, pumping refrigerant to meet the unit’s cooling demand.
Refrigerant – A chemical contained in most residential air conditioning systems, which expands and vaporizes while producing a refrigerating effect.
Condenser Coil (Outdoor Coil) – a part of the air conditioner, used to dissipate heat from the refrigerant, causing the refrigerant to change from vapor to liquid.
Split System – Combining an outdoor unit, such as a heat pump or air conditioner, with an indoor unit, such as an air handler or furnace.
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