Synonyms for Furnace:

n.

dehumidifier, central heating, air, ac, air conditioning, convector, air-conditioned, air conditioner. furnace (noun)
warmer, firebox, sun lamp, Bunsen Burner, hearth, jet, fireplace, burner, register, potbellied stove, Franklin stove, blast furnace, coal stove, infrared lamp, water heater, radiator, heater, induction heater, steam heater, smelter, coke oven, solar heater, kiln.
heater (noun)
gas furnace, open-hearth furnace, hot-air furnace, electric furnace, forge, hot-water furnace, boiler, reduction furnace, oil burner, smithy, BOF, stove, basic oxygen furnace, heating system, steam furnace, annealing furnace.
heating mechanism (noun)
oil burner, Franklin stove, heater, boiler, forge, smithy, kiln, stove, heating system.
hell (noun)
mire, holocaust, hades, morass, limbo, oven, bedlam, abyss, purgatory, inferno, styx, gehenna, horror.
oven (noun)
kiln.

Other synonyms:

Other relevant words:
oil burner, stove, electric furnace, heating system, smithy, boiler, forge, BOF, air-conditioned, dehumidifier, convector, air.

Usage examples for furnace

  1. Guards, let them be bound and cast into the furnace to which I pray daily. – Jewish Fairy Tales and Legends by Gertrude Landa
  2. I have here a furnace with a pipe going through it like an iron gun- barrel, and I have stuffed that barrel full of bright iron- turnings, and placed it across the fire, to be made red- hot. – The Chemical History Of A Candle by Michael Faraday
  3. But for the rest, opposition is the test- furnace of new ideas. – Dreamers of the Ghetto by I. Zangwill