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HVAC Glossary

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A measure of a material's thermal resistance, or resistance to the transfer of heat. R-Value is used to describe the heat resistant capabilities of insulation material. The higher the R-value of a material, the greater it's heat resistant and insulating capacity.

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A type of radiant heating system that is installed in a floor, emitting heat from the floor up into a space. Usually, radiant floor heating is achieved by installing tubes with circulating hot water in the floor.

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A type of heating system that emits heat from a surface, such as hot water radiators, in floor hot water tubes, or electric baseboards, into a living space. Because no moving air is required to heat a space with radiant heat, some of the draft and dust problems of lower quality central heating systems are eliminated.

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A component of a radiant heating system that radiates heat from its surface into a room. The heat is usually supplied to the radiator through hot water or steam circulation.

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Occurs when the air or gases being exhausted from a building are immediately pulled back into the building through an air intake or other opening.

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A fluid used in air conditioners, heat pumps, refrigerators, and other cooling equipment to transfer heat from one place to another. Because of its low boiling point, refrigerant easily evaporates, making it highly effective at transferring heat energy. There are many different refrigerant compounds, including R-22 (Ozone depleting) and R-410A (Ozone friendly). Under current federal law, it is illegal to manufacture and ship new equipment loaded with R-22 refrigerant due to it's Ozone-depleting properties. However, units are still allowed to be manufactured and "dry shipped" without R-22, then subsequently charged with R-22 after installation.

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The capacity of air to hold moisture changes depending on it's temperature. As air temperature rises, it's capacity to hold moisture increases. Relative humidity is a measure of the amount of moisture in the air as a percentage of its capacity to hold moisture at its current temperature.

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Air returning from a conditioned space into a heating or cooling appliance in order to be reheated or cooled.

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Ducts which house return air, returning it to the heating or cooling appliance. Ducts are connected to return air grilles. Due to the lower pressure in return air ducts, air moves from the conditioned space of a room, through the return grilles, and into return air ducts to be sent back through the heating or cooling appliance.

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License Number: EVERGRL954R2
Since 1975
trane dealer Seattle, West Seattle, South Seattle, North Seattle, Ballard, Greenlake, Bellevue, Kent, Renton, Federal Way, Auburn, Redmond, Shoreline, Kirkland, Sammamish, Lynnwood, Bothell, Burien, Issaquah, Des Moines, SeaTac, Mercer Island, Maple Valley, Kenmore, Mukilteo, Mountlake Terrace, Tukwila, Mill Creek, Covington, Lake Forest Park, Woodinville, Newcastle, Snohomish, Duvall, Normandy Park, Stanwood, North Bend, Clyde Hill, Medina Evergreen Refrigeration, Seattle, West Seattle, South Seattle, North Seattle, Ballard, Greenlake, Bellevue, Kent, Renton, Federal Way, Auburn, Redmond, Shoreline, Kirkland, Sammamish, Lynnwood, Bothell, Burien, Issaquah, Des Moines, SeaTac, Mercer Island, Maple Valley, Kenmore, Mukilteo, Mountlake Terrace, Tukwila, Mill Creek, Covington, Lake Forest Park, Woodinville, Newcastle, Snohomish, Duvall, Normandy Park, Stanwood, North Bend, Clyde Hill, Medina