The best replacement for two stage furnace is single stage.


The best alternatives to two stage furnace are rated as following:
★★★★★  single stage
★★★  one stage furnace
★★★  one stage
★★  variable speed
★  three stage furnace
★  single stage furnace
★  two stage variable speed
  modulating
  variable stage furnace

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Speaking about two stage furnace, one probably shouldn't forget about single stage thermostat.

Other search terms related to two stage furnace and their ratings are:

★★★★★ single stage thermostat
★★ one stage thermostat
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two stage furnace
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one stage furnace