Look for the line that states " Model Number" or "M/N". Subsequently, one may also ask, how do you read a Heil model number? The 8th digit of the serial number, which will be a letter (and typically the next to last digit) denotes the year of manufacture for units manufactured from the 1980s to the early 1990s:įurthermore, how long does a furnace last? 15 years.
How do I tell the age of an Armstrong Air furnace or air conditioner from the serial number? In this manner, how do I read my Armstrong Air serial number? In your case, the serial number is 7 digits with no prefix. The "prefix" serial numbers you mentioned on Armstrong flutes are 2 digits, a dash, plus 5 more digits.
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