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If you want to convert from an electric furnace to a gas furnace, you will need to have gas piping and ductwork installed first. This will add an additional up-front cost to the furnace and installation process of around $5,000 to $15,000 or more depending on the space.
Sorry - could not find that model number in current models from Bryant or Carrier. A new standard line Carrier/Bryant furnace costs about $1000-2000, from about 45,000 to 120,000 Btu. A few national pricing guides indicate about $1500-2000 is the normal gas furnace installation price. Therefore, a $2500-4000 total cost would be expected as normal range for a routine conventional gas furnace installed cost - far more for a high-efficiency condensing unit. So you appear to be in the range, especially if this is a 90% or more efficient unit and/or high Btu output.