The best replacement for variable speed is multi speed furnace.

The best alternatives to variable speed are rated as following:
★★★★★  multi speed furnace
★★★★★  single speed furnace
★★★★  two stage furnace
★★★  2 stage furnace
★★★  2 stage
★★★  2 speed pool pump
★★  multi speed
★★  ecm motor
★  modulating furnace
★  fixed speed
★  2 speed
★  constant torque
★  two stage
★  personal pace
★  single speed pool pump
  single stage furnace
  multi
  x13
  two speed furnace
  2 speed furnace
  two stage furnaces

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variable speed
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