The best replacement for vav is vvt.

The best alternatives to vav are rated as following:
★★★★★  vvt
★★★★  cav
★★★  vrv
★★  fcu
★★  constant volume
★★  fan coil
★  vrf
★  fan powered box
★  waw
★  fpb
  piu
  chilled beams
  series vav
  doas
  multizone

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Google Trends

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