Heating, Ventilation, and Air Conditioning (HVAC) Is the technology of indoor and vehicular environmental comfort.lts goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, and 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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