Originally Posted By: dbowers
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Dave - I don’t have a Preston Guide at home, but Gibson used the last 3 numbers (072) in the Model number to designate size. So it would be a 72,000 BTUH furnace. The “R” stands for residential and the “A” means its an upflow unit. The “C” at the end of the Model number tells you its made in the US/Canada. THE “KG” tells you it is Gas and is an 80% (+) efficient unit.
The serial number would tell the age, but I don't see enough Gibsons (1 or 2 max p/year) to be really familiar with reading the s/n. But if I remember correctly, I think it would be 1-3 years old.
Dan Bowers, CRI