DB

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The relative loudness of a sound is expressed in dB, short for decibel. As an example, the sound of a human voice talking is around 70 dB. (See also SRN.)

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COP

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The Coefficient of Performance rates a heat pump’s ability to efficiently use electricity in its operation. The Air Conditioning and Refrigeration Institute provides the Coefficient of Performance at 47 degrees Fahrenheit and 17 degrees Fahrenheit. This is because a heat pump is more efficient at higher, outside-air temperatures.

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CONDENSER

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The coil responsible for dissipating heat to the surrounding, outside air. Also called the condenser coil, or outdoor coil, its role is reversed when a heat pump is used in heating mode.

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COMPRESSOR

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The compressor plays an integral role in cooling your home. It is the device responsible for pumping refrigerant through the refrigerant lines and the coil, making the transfer of heat from inside your house to the outdoors possible.

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CFM

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A unit to express movement of volume, including air, in Cubic Feet per Minute. A 400 CFM air handle moves 400 cubic feet in one minute.

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CAPACITY

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Usually measured in BTUs or tons, capacity refers to an air conditioning or heating unit’s ability to cool or heat a space. For instance, a 20-ton air conditioning unit has twice the capacity of a 10-ton unit.

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BTUH

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The heat transfer rate of HVAC equipment is measured in British Thermal Units per Hour.

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BTU

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Short for British Thermal Unit. The amount of heat required to raise or lower the temperature of one pound of water by one degree Fahrenheit.

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ARI

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The Air Conditioning and Refrigeration Institute is an organization created by HVAC manufacturers to ensure an acceptable level of quality within the industry. ARI is a voluntary, nonprofit organization which publishes ratings standards and benchmarks for testing cooling and heating products.

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Why is my unit icing up? I have frost on the coil and copper tubing.

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There are several reasons for an air conditioning system to freeze up and they are ALL related to a lack of maintenance. Air conditioning coil freeze up is caused by a lack of airflow or a lack of refrigerant (FREON). Both of these conditions are easily and routinely found on a service check. A-1 Heat & Air will make sure airflow passages are free and that you are refrigerant (FREON) charge is up to standard.

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