The best replacement for 2 stage is 1 stage furnace.

The best alternatives to 2 stage are rated as following:
★★★★★  1 stage furnace
★★★★  1 stage snowblower
★★★★  modulating furnace
★★★  single stage trigger
★★★  single stage snow blower
★★★  variable speed furnace
★★★  1 stage trigger
★★  3 stage snowblower
★★  single stage compressor
★★  1 stage snow blower
★★  single stage
★★  3 stage furnace
★  1 stage compressor
★  single stage furnace
★  1 stage
★  single stage air compressor
★  3 stage snow blower
★  single stage snowblower
★  single stage paint
★  1 stage snow thrower
  modulating
  variable speed

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2 stage
1 stage furnace
1 stage snowblower