(Kiln; Oven) In a dream, a furnace means distress, burdens, trouble and suspicion. Seeing a limekiln in a dream means backbiting people of knowledge or religious scholars. As for a brick-kiln in a dream, it means oppression, injustice or polytheism.
A furnace or a kiln in a dream also represents hell-fire and its people.... Islamic Dream Interpretation
Dreams of a furnace symbolize that things are heating up, and that romance and passion are around the corner. This dream is telling you that it is time to radiate your light. Or, this dream might reflect that you have too many blankets on you as you sleep.... Strangest Dream Explanations