The best replacement for single stage is two stage furnace.

The best alternatives to single stage are rated as following:
★★★★★  two stage furnace
★★★★★  two stage trigger
★★★★  two stage
★★★  two stage compressor
★★★  two stage snow blower
★★★  two stage paint
★★★  two stage air compressor
★★  turret press
★★  dual stage
★★  dual stage snowblower
★★  two stage snowblower
★  2 stage snowblower
★  dual stage furnace
★  two stage heat pump
★  base clear
★  progressive press
★  2 stage trigger
★  two stage air conditioner
★  dual stage compressor
★  2 stage paint
★  two stage ar trigger
★  progressive reloading
★  2 stage furnace
★  2 stage air compressor
★  two stage ac
★  two stage air compressors
★  base coat clear coat
★  dual stage snow blower
  two stage snow blowers
  double stage furnace
  2 stage
  double stage trigger
  dual stage air compressors
  two stage ac compressor
  two stage snow throwers
  two stage snowblowers
  two stage compressors
  two stage gas furnace
  dual stage air compressor
  dual stage regulator
  turret reloading press
  2 stage vacuum pump
  dual stage snow thrower
  bc cc
  bc/cc
  dual stage trigger
  two stage snowthrower

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single stage
two stage furnace
two stage trigger