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Sort of rooftop unit, familiarly
Answer for the clue "Sort of rooftop unit, familiarly ", 4 letters:
hvac
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Wikipedia
Word definitions in Wikipedia
HVAC ( heating , ventilating /ventilation, and air conditioning ) is the technology of indoor and vehicular environmental comfort. Its goal is to provide thermal comfort and acceptable indoor air quality . HVAC system design is a subdiscipline of mechanical ...