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HVAC Glossary

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Heat that flows from the interior conditioned space of a building to the unconditioned space outdoors. Some heat loss is necessary as a healthy building must breathe. However, unintended heat loss, such as through holes in insulation, poorly constructed windows, or unsealed ducts results in higher than needed heating and cooling costs in a building.

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A process which calculates the amount of heat lost to the outdoors from a home. This process allows for the proper sizing of heating and cooling equipment for the home. Proper equipment sizing is extremely important for the comfort of the home and to maximize the useful life of the HVAC equipment.

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A device that provides heating or cooling for a home by absorbing heat energy from one place and moving it to another place through the use of a compressor and refrigerant. Most of the heating and cooling energy used by heat pumps is heat absorbed from the outdoor environment rather than the electricity consumed by the heat pump, making heat pumps one of the most energy efficient ways to both heat and cool a home. Heat pumps are 200% to 350% more efficient than conventional electric resistance heat, such as an electric furnace or electric baseboards.

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The amount of heat flow required to maintain a desired temperature in a building, measured in BTU's per hour.

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High Efficiency Particulate Arresting filters. In order to qualify for the HEPA standard in the U.S. a filter must remove at least 99.97% of particulates above .3 micrometers from the air. True HEPA filters are MERV 17 to 20 and cause a large amount of static pressure in the system, rendering them impractical and uncommon in most residential HVAC applications.

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Heating Seasonal Performance Factor. HSPF is a measurement system used to measure the heating efficiency of air source heat pumps. In the pacific northwest, our heating season is much longer than our cooling season, making HSPF the primary rating used to measure heat pump efficiency. In warmer climates, heat pump efficiency is primarily measured using SEER.

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An nationally recognized energy rating program designed to calculate the energy efficiency of homes. This rating system allows homes to be rated and compared by home buyers and renters for energy efficiency.

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An appliance which raises the level of humidity in the indoor air of a home.

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A measurement of the amount of moisture in the air.

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An acronym for Heating, Ventilation, and Air Conditioning.

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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