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Hi, I am replacing my old oil furnace(approx. 1976 Coleman) with a gas furnace in my mobile home. Gas is now available. Will I have to worry about the BTU output of the new furnace. I am not sure yet as to the size of the duct. I was hoping to be able to put in a used unit with approx. 60,000 to 90,000 BTU downdraft.
Another question I have is about the venting. How can I use the old chimney from the old oil furnace as the vent for the new gas one. If I buy the correct gas unit will I be able to naturally vent. I am trying to avoid tearing the old one out and having to do roof repair. Maybe put the vent inside of the existing one?

Hi,

You would need to do a Manual J Load Calculation to know exact size needed. If it heated adequately before, probably same size needed again.


It will need to be a gas furnace rated for mobile homes also.

You will need a new roof jack to be compatible with the furnace you select.


Thanks,
Robert