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Category: Glossary

A method of sectioning a home into different comfort zones so each zone can be individually controlled depending on use and need. An air conditioning system capable of maintaining diverse conditions for various rooms or zones.

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The unit of electrical power equal to the flow of one amp at a potential difference of one volt. A single watt is equivalent to the work done at a rate of 1 joule (the SI unit of energy measuring heat, electricity and mechanical work) per second.

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The fan motor inside a variable speed air handlers is designed to vary its speed based on your home’s heating and air conditioning requirements. Working in conjunction with the thermostat, it keeps the appropriate temperature air (e.g. warm air on cold days) circulating throughout your home, reducing temperature variances in your home. It also provides…

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The force that pushes electrical current along wires and cables. Term voltage used to indicate the potential difference in a circuit, voltage is also known as the pressure which causes current to flow.

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A unit of measure of electrical force given to the electrons in an electric circuit. A single volt is the electromotive force that will cause a steady current of one ampere to surge through a resistance of one ohm. Abbreviated by the symbol "v".

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A thermometer whose bulb is covered with a piece of watersoaked cloth. It is a type of temperature measurement that reflects the physical properties of a system with a mixture of a gas and a vapor, usually air and water vapor.

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A pressure below atmospheric pressure. 30 inches Mercury (periodic symbol "Hg") is a perfect vacuum.

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A furnace in which air is drawn in through the bottom or sides and expels warm air out the top.

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Underwriters Laboratories.

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The factor amounting to the resistance of heat flow through various building materials.

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