The best replacement for furnace is boiler.

The best alternatives to furnace are rated as following:
★★★★★  boiler
★★★  heat pump
★★  gas furnace
★  space heater
★  water heater
★  air handler
★  electric furnace
★  heater
★  oven
★  kiln
★  radiator
★  boiler efficiency
★  heat pump cost
★  oil furnace
  radiant heat
  boiler difference
  hvac
  thermostat
  propane
  gas
  electric heater
  trane
  electric
  central heat
  propane furnace
  gas fireplace
  oil
  single stage
  fireplace
  downflow furnace
  american standard furnace
  90% furnace
  one stage furnace
  fireplace efficiency
  baseboard
  two stage furnace
  air conditioner
  2 stage
  one stage
  lennox
  electric heat pump
  edenpure
  carrier
  stove
  baseboard heating
  hot water heater
  space heaters
  goodman furnace
  climatemaster
  electric heat
  baseboard heat

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

Other search terms related to furnace and their ratings are:
★★★★★ humidifier
★★★ heat pump
★★ air conditioning
★★ ac
★★ central air
★ air conditioner
★ hopper
hot water heater
You have in mind a companion for furnace and it is not yet here? Propose!



Google Trends

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