| A method of heating consisting of system with pipes placed in the floor, wall, or ceiling. Also a method of heating with electrically heated panels.
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| A colorless, odorless, radioactive gas that comes from the natural breakdown of uranium in soil, rock and water. |
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| A temperature control device, typically found on a wall inside that consists of a series of sensors and relays that monitor and control the function of a heating and cooling system. |
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| A substance that produces a refrigerating effect while expanding or vaporizing. |
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| Combination grille and damper assembly covering an air opening or end of an air duct. |
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| The ratio of the amount of vapor contained in the air. Normally expressed as a percentage. |
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| Air drawn into a heating or cooling unit after having been circulated from the heater or cooler's output supply to a room. |
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| A central air conditioner consisting of two or more major components. This is the most common type of system installed in a home. |
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| The unit of measure used in air conditioning to describe the cooling capacity of a system. |
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| A furnace that pulls return air in from the bottom and expels warm air from the top. |
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