The average base cost for an 85,000-BTU Carrier oil furnace as of 2015 was $1890, according to Furnace Price Guide. Prices for equivalent furnaces from other manufacturers ranged from $1,360 to $2,300 with an overall average of $1,836. Other manufacturers include Armstrong, Rheem, Lennox and Trane.
Carrier's average cost was greater than Armstrong and Rheem, but less than Lennox and Trane. Carrier also manufacturers gas furnaces. Using a 90-percent-efficient 80,000-BTU gas furnace for comparison purposes, Carrier prices also stand near an overall average cost among gas furnace competitors. The Carrier gas furnace has an average base cost of $1,164, while the range for all competitors spanned from $680 to $1,410. The overall average for all manufacturers was $1,215. Payne gas furnaces were the least expensive, while Lennox had the highest cost.