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HVAC (heating, ventilation, and air conditioning) refers to technology of indoor and automotive environmental comfort. HVAC system design is a major subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilating is dropped as in HACR (such as the designation of HACR-rated circuit breakers).
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Heating Ventillation & Aircooling
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the heating, ventilation, and air conditioning system of a building.
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