Need to know age of furnace: Model # G1D91AU100D16C---Serial # 8402H16425---just purchased home.Post created: 2016-03-16 Type of Equipment: Furnace Views: 144
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On 2016-03-17 Eric wrote:
With an Armstrong furnace the date of manufacture is in the serial number. Based on the number you provided (8402H16425) I believe your furnace was built in August 2002. Below is the breakdown on how I came up with the date.