Glossary Archives - Page 3 of 11 - Heat Relief Heating & Cooling


Seasonal Energy Efficiency Ratio. A measure of seasonal or annual efficiency of a central air conditioner or air conditioning heat pump. It takes into account the variations in temperature that can occur within a season and is the average number of BTU (British thermal units) of cooling delivered for every watt-hour of electricity used by …

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The temperature or pressure at which a controller is set for desired comfort level.


A chemical substance that produces a refrigerating effect while expanding and vaporizing.

Reciprocating Compressor

A compressor that uses pistons driven by a crankshaft to deliver gases at high pressure.


Polyvinyl chloride; a type of plastic. In recent years, PVC has been replacing traditional building materials such as wood, concrete and clay in many areas.


Pounds per square inch gauge.

Refrigerant Charge

The required amount of refrigerant in a system.


Pounds per square inch.

Package Unit

A heating and cooling system contained in one outdoor cabinet. This package unit is typically installed on the roof, beside, or sometimes in the attic of a home.


Original equipment manufacturer.

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