The best replacement for gas furnace is heat pump.

The best alternatives to gas furnace are rated as following:
★★★★★  heat pump
★★★★★  electric furnace
★★★  electric heat pump
★★★  electric
★★★  boiler
★★  oil furnace
★★  gas fireplace
★★  oil
★  electric heater
★  heat pump cost
★  electric furnace cost
★  air handler
★  electric baseboard
★  space heater
  geothermal heat pump
  electric space heater
  gas boiler
  single stage
  gas logs
  pellet stove
  electric space heaters
  baseboard heat
  fireplace
  wood stove
  electric heat
  geothermal

Your alternative for gas furnace is not listed? Suggest!
Speaking about gas furnace, one probably shouldn't forget about heat pump.

Other search terms related to gas furnace and their ratings are:
★★★★★ heat pump
★★ electric heat pump
★★ air conditioner
★ power outage
heat pump backup
You have in mind a companion for gas furnace and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of gas furnace in all years. Click on graph for more.
gas furnace
heat pump
electric furnace