HVAC is an acronym for:

  • Cardiovascular disease
  • Line with direct contact with the enemy during the war, see War Front # main line (HVAC )
  • Main battle line, right-wing band
  • Helsingin Kaupungin liikennelaitos, the transport companies of the Finnish capital Helsinki
  • Heating, ventilation, air conditioning (see also HVAC system); Collective term in air conditioning technology
  • Mark, or grade: Categorization for sensitive or perishable goods
  • Frequency class, a term used in linguistics
  • A hollow cathode lamp
  • Country of origin
  • HVAC Construction GmbH
  • Cardiac catheterization laboratory, cardiac catheter measurement

Hkl is the abbreviation for:

  • Miller indices. They are used in crystallography the unique designation of crystal faces or planes in the crystal lattice.
  • Disambiguation
  • Abbreviation